Chemistry Homework Questions & Answers Archive

Which of the following factors would speed up the rate of a chemical reaction? Larger reacting particles Lower temperature Removing the biological catalysts High concentration of reacting particles

Determine the products for the following reactions.

Are all drugs capable of causing side effects?

Atoms, Ions and Molecules In the table below, there are descriptions of an experiment on samples of three different chemical compounds. Decide whether the compound is ionic or molecular, if you can. If there is not enough information to decide, choose can't decide in the third column. compound description ionic or molecular? --------- 1 Compound 1 is a clear liquid with a strong smell. If heated gently it boils at 115 °C. Onic 2 Compound 2 is a dull white smooth solid which does not conduct electricity. Applying an ordinary laboratory burner to the material only makes the substance hot, it does not otherwise change. In fact, the substance can't be melted or even softened by any ordinary laboratory equipment. (can't decide) 3 Compound 3 is a hard white smooth odorless solid, which is insoluble in water. If the flame from an ordinary laboratory burner is held on the solid for 10 minutes, the solid grows hot to the touch but does not soften. O molecular

Encuentra la media, mediana, moda, rango y desviación media 5,10,6,7,10,8,9

Consider a hypothetical chemical reaction: A+B → C+D (In this equation A, B, C, and D stand for some unknown chemical formulas.) Here is an energy diagram for the reaction: Use the energy diagram to answer these questions. What is the heat of reaction? [1] kJ / mol Is the reaction exothermic or endothermic? Exothermic Endothermic Neither Can you determine the activation energy? Yes, it's [square] kJ / mol No. Can you determine the activation energy of the reverse reaction? C+D → A+B Yes, it's [square] kJ / mol No.

Factor the trinomial completely. 25x^2(y-3)^2+35x(y-3)^2+49(y-3)^2 Select the correct choice below and fill in any answer boxes within your choice. A. 25x^2(y-3)^2+35x(y-3)^2+49(y-3)^2= B. The polynomial is prime.

A CaSOA system is at equilibrium at 25°C. CaSO4(s) ⇌ Ca^2+(aq) + SO4^2-(aq) Which direction will the reaction shift if the equilibrium system is warmed to 40°C ? Ksp = [Ca^2+][SO4^2-]

Which of the following is NOT a way to satisfy the octet rule? a having a full outer electron shell b transferring inner electrons to fill the outer electron shell c transferring valence electrons in an ionic bond d sharing valence electrons in a covalent bond

The chemical formula for dimethyl ether is: CH3OCH3 Calculate the molar mass of dimethyl ether. Round your answer to 2 decimal places. g · mol^-1 × 10

During a strenuous workout, an athlete generates 1940 kJ of heat energy. What mass of water would have to evaporate from the athlete's skin to dissipate 1940 kJ of heat?

Gold and other precious metals are easy to store for long periods of time because they will not spoil, making them an example of which of the following? Double coincidence of wants Unit of account Store of value Medium of exchange

We still have no proof that life can exist on other planets. Kepler-160e is the best candidate for an Earth-like planet. Most exoplanets have been found orbiting red dwarf stars. A planet's surface must have liquid water for life to exist.

Consider a sodium (Na) atom. a. What is the mass of one atom of Na (include units) b. Given that 1 amu=1.6606 × 10^-24 grams, find the mass of a mole of Na atoms. c. What are the units of your calculation?

A hydrogen atom absorbs a photon, and an electron transitions from energy level 1 to 3. For scientific notation answers, please enter 1.23 e 21 to represent 1.23 x 10^21 What is the electron's initial energy? What is the electron's final energy? Ephoton = J h = s fphoton = s cphoton = m / s lambdaphoton = m

Balance each equation. (Use the lowest possible whole number coefficients. Omit states-of-matter from your answers.) (a) Mg(OH)2 + HCl -> MgCl2 + H2O + -> + (b) Ca(NO3)2 + H2S -> CaS + HNO3 + -> + (c) CH4 + O2 -> CO2 + H2O + -> + (d) CaCO3 + HCl -> CaCl2 + CO2 + H2O + -> + +

Provide the correct IUPAC name for Pb(SO3)2.

Convert from moles to grams. 1) 2.3 mol Mn 2) 0.017 mol C 3) 6.2 mol H2 4) 30 mol H2O 5) 5.78 mol NaCl 6) 0.5610 mol SiO2 7) 0.478 mol N2O4 8) 1.8 * 10^-3 mol H2CO3 9) 0.0054 mol Mg(NO3)2

Stoichiometry Writing a chemical equation from a molecular movie The movie below shows some molecules in a tiny sample of a mixture of gases. Drag the slider to see how the molecules move. Does a chemical reaction happen during this movie? O yes O no If a chemical reaction does happen, write a balanced chemical equation for it.

Just How Faithful Is Old Faithful? The name 'Old Faithful' is synonymous with the geologic features known as geysers. But whot, exactly, is a geyser, and how does it work? How Geysers Start Our Earth consists of many regions where magma, or hot lava. lies beneath the surface. This magma works like a burner on a stove, hooting any water in the ground until it grows very hot Mast water beneath Earth's surface comes from rain and melting snow. This water passes through cracks in the earth and collects underground. If this water lies close enough to hot magma, it heats and begins to boll: Why does the author include a section on Yellowstone's Old Faithful? to introduce the idea that even the most reliable of geysers can be inconsistent to illustrate the importance of geysers to our natural world and our environment's health to provide information about geysers and how we can preserve them worldwide to explain how geysers are formed below Farth : surface and how they erupt

Complete the table to determine the nuclear symbol for this neutral atom. Nuclear Symbol Subatomic Particles Protons: 72 To which element does this atom belong?

1. For which type of measurement would you use the following measuring devices? a. Thermometer b. Digital electronic balance c. Pipette d. Graduated cylinder e. Ruler 2. For the abbreviated units listed below, give the full unit name, the type of measurement they are used for (Example: mass, volume, length, temperature). Unit Full Name of the Unit Type of Measurement --- --- --- mL Milliliter Volume m μm ng g L °C °F

On the first chemistry test, 15 students got As, 20 students got Bs, and 19 students got Cs. Part A What is the percent of students who received Bs? Express your answer to the ones place. Express your answer to two significant figures and include the appropriate units. Part B What is the percent of students who received Cs? Express your answer to the ones place. Express your answer to two significant figures and include the appropriate units. The percent of students who received Cs=

Part IV. Essay. 10 Points. Please answer the following as complete as possible. 20. Entropy is a fantastically important concept in thermodynamics and thus it is the focus of one of the laws of thermodynamics (the 2nd one). Tell me why understanding entropy is important in life and death, and chemistry. Use specific examples, equations, and relationships to other chemical concepts. Extra credit (+1): If the ΔG for the reaction C(s, diamond) → C(s, graphite) is -3 kJ, how come are diamonds not spontaneously turning into graphite?

Quarter 2 Assessment: Part 1 Water Quality Research and Guiding Questions Below are several questions that you may use to guide your research regarding the water quality at OMHS and around the world. Please be sure to answer all questions in as much detail as you can. Also be sure to record where you found the information (a website link will suffice). Read the following articles and answer the questions: Health Effects of Lead in Drinking Water cwswater Lead in drinking water infographic 1. Who is at the greatest risk for lead poisoning? (paragraph 1) 2. According to the EPA, drinking water makes up what percent of a person's exposure to lead? (paragraph 2) 3. What are two steps you can take to reduce your exposure to lead in drinking water? (paragraph 3) Drinking Water I WHO 4. Aporoximately what percent of the world's

Assuming all outer atoms are the same element, which molecule is polar?

If grams of a substance are given, will you use Avogadro's as your first step?

7. What functional group is not present in the following molecule? A) amine B) ketone C) alkene D) amide

Application Practice Problems: Limiting Reactant Stoichiometry Instructions: Complete the following conversions, showing all of the steps in your work. Copper (I) sulfide is produced from the synthesis of copper and sulfur 2 Cu + S → CuS 2. What is the limiting reactant when 80.0 g Cu reacts with 25.0 g S 80.0 Cu × 1 mol Cu / 63.55 g = 1.25 mol × 1 mol S / 2 mol Cu = 0.830 mol S 25.0 g S × 1 mol S / 32.07 g = 0.779 mol × 2 mol Cu / 1 mol S = 1.558 mol Cu Cu is limiting b. What is the maximum number of grams of Cu2S that can be formed when starting with the quantities of each reactant given above? c. How many grams of the excess reactant will remain after the limiting reactant is consumed?

Clothing and Fibers Blends Cotton Fire Retardant Knitted Linen Man Made Natural Nylon Permanent Pres: Polyester Rayon Silk Stamped Water Repelle Wool Woven Use the clues to fill in the puzzle with the correct word. There are NO SPACES between words in an answer. Across 2. A natural fiber that is versatile, comfortable and inexpensive. 5. A natural fiber that comes from a worm; it is comfortable and resists wrinkling. 8. This is when the yarn is woven at right angles to form a fabric. 9. A synthetic fiber that is elastic and wrinkle resistant, but pills easily. 10. This fabric finish will not wrinkle. 11. This is when the fabric has the pattern applied after it has been woven. 13. A natural fiber that is warm, and keeps it's shape well, but moths love to eat it! 14. This is another name for a synthetic fiber. 16. This is what you call a fiber that is made of more than one type of fiber. 17. This is what you call fibers that we get from nature. 18. This fabric finish causes a fabric to resist water. Down 1. A Synthetic fiber that is wrinkle resistant, but doesn't breathe. 3. This fabric finish will extinguish itself if it catches on fire. 4. A synthetic fiber that resembles silk, but easily gets static electricity. 6. This is when the yarns are interlaced or looped to form a fabric. 7. A synthetic fiber that resembles wool and is warm, but pills easily. 12. A synthetic fiber that resembles cotton, linen and silk. 15. A natural fiber that is comfortable, and absorbent, but wrinkles easily.

Will these ions make compounds? Li^1+ ? Ca^2+ and F^1- ? O^2- ? O^2- and Cl^1- ?

4. Which scale is used to measure recipe ingredients from 1 / 4 ounce to 1 pound to 2 pounds? a. Baker's scale b. Digital scale c. Portion scale d. Balance scale 5. A very shallow pan about 1 inch deep used for anything from baking cookies to roasting vegetable is called a a. sheet pan. b. cake pan. c. crêpe pan. d. springform pan Which type of knife is used to slice bread and cake? a. Utility b. Tourné c. Santoku d. Serrated An oyster knife is used to a. trim oysters. b. shuck oysters. c. chop oysters and clams. d. crack oysters, clams, and other shellfish.

9.16 × 10^24 molecules of CO2

How much energy is evolved or absorbed as heat if 8.50 kg of Ca(OH)2 reacts with a stoichiometric amount of CO2? Heat = k

You want to determine the % of an acetic acid sample solution by acid/base titration. Therefore, you prepare a NaOH solution. To determine the exact concentration of this NaOH you titrate exactly 390.3 mg KHPhthalate ( M=204.22 g / mol ) with this NaOH solution requiring 8.2 ml. Subsequently you use this NaOH solution to titrate 25.0 ml of your acetic acid sample ( M(acetic acid)=60.05 g / mol, density of solution =1 g / ml ) resulting in a consumption of 6.9 ml of the NaOH solution. Please give all relevant reaction equations (with correct stoichiometry). Calculate the exact concentration (in mol / L) of the NaOH solution. Please calculate the weight-% of acetic acid in the sample solution. Which indicator would you use for this titration/at which pH range would you expect the equivalence point?

Which element did Mendeleev predict would have an atomic mass of 68 and be a soft metal? a gallium b erbium c potassium d magnesium

Atoms, Ions and Molecules Identifying common polyatomic ions Complete the following table: Some polyatomic ions name chemical formula chlorate anion hydronium cation CN^- nitrate anion

3) Graph of y=B(t) a) What is the domain of B(t)? Write it in reduced interval notation. b) What is the range of B(t)? Write it in reduced interval notation. c) Evaluate B(2). d) Pretend that ε>0 is a very small positive number. You don't know its specific value. It is just really small. Explain why this statement is false: When t ∈(2-ε, 2+ε), then B(t) is close to -6.

Draw the Lewis structure of NO2-.

A recent study of patients found that of 95 alcoholic patients, 82 had elevated cholesterol levels, and of 305 nonalcoholic patients, 64 had elevated cholesterol levels. If a patient is selected at random, find the probability that the patient is the following. Round your answers to three decimal places. Part 1 of 3 P( alcoholic with elevated cholesterol) = Part 2 of 3 P( nonalcoholic) =

When the following molecule is hydrogenated using H2 gas and a Pt / Pd catalyst, what will the product be?

Prepare general journal entries to record these transactions using the following titles: Cash (101); Accounts Receivable (106); Office Supplies (108); Office Equipment (163); Automobiles (164); Building (170); Land (172); Accounts Payable (201); Notes Payable (250); Common Stock (307); Dividends (319); Consulting Revenue (403); Salaries Expense (601); and Utilities Expense (602). The company purchased land valued at 45,000 and a building valued at 160,000. The purchase is paid with 30,000 cash and a note payable for 175,000. Note: Enter debits before credits.

A molecule of the compound responsible for the odor of garlic

8 In which process are microbes genetically changed to produce animal proteins? A. adaptation B. variation C. genetic engineering D. selective breeding

What are the configurations for the two chirality centers? A. a=R, b=R B. a=S, b=S C. a=R, b=S D. a=S, b=R

At a drug rehab center 32% experience depression and 30% experience weight gain. 13% experience both. If a patient from the center is randomly selected, find the probability that the patient (Round all answers to four decimal places where possible.) Tip a. experiences neither depression nor weight gain. b. experiences depression, given that the patient experiences weight gain. c. experiences weight gain, given that the patient experiences depression. d. Are depression and weight gain mutually exclusive? O no O yes e. Are depression and weight gain independent? O yes O no Calculator Scratchwork Area

acid strong or weak? species present at 10^-6 mol/L or greater when dissolved in water --- H2CO3 weak H2S weak HClO2 weak HI strong

dissolved in a liter of water. acid strong or weak? species present at (10^-6 mol/L) or greater when dissolved in water --- --- --- (mathrmH2 mathrmCO3) weak (mathrmH2 mathrm~S) weak (mathrmHClO2) weak HI strong

Given lim as x approaches 11 of f(x)=-5 and lim as x approaches 11 of g(x)=-12, evaluate lim as x approaches 11 of [5f(x)-2g(x)]. lim as u approaches +1 of [5f(x)-2g(x)]=-1 lim as u approaches ++ of [5f(x)-2g(x)]=-49 lim as v approaches . of [5f(x)-2g(x)]=1 lim as x approaches +... of [5f(x)-2g(x)]=49

Question 2 Under which of the following conditions would one mole of Ne have the highest entropy, S? 137°C and 25 L 27°C and 25 L 137°C and 35 L 27°C and 35 L

Multiple Select Question Select all that apply Calcium absorption in the small intestine is achieved with the help of calcitonin. hydroxyapetite. calcium-binding protein. Vitamin D.

Which genetic method attempts to predict how an individual will react towards drugs? Pharmacogenomics Crispr GWAS Gene therapy

drop the chemical formula to classify each as a compound or an element. Compound Element Chemical Formula H-O-H, O=C=O drop the correct answers into the boxes. You can also click the correct answer, then the box where it should go. Reset my answers.

Select the correct VSEPR shape for the molecular compound. CF4 □ PCl3 □ CH2S □ CO2 □ SeF2 □

50.09 × 100/1014 =

Decide which element probably forms a compound with oxygen that has a chemical formula most and least similar to the chemical formula of the compound formed by oxygen and strontium.

6. Which of the following is an example of a destructive force? - A) Glacier formation - B) Sediment deposition - C) River erosion - D) Mountain building

Write the expanded structural formula of 2-pentanol.

With the exception of water, matter when heated a Solidifies b. Contracts c. Expands d Condense

The diagonals of this rhombus are 7 kilometers and 30 kilometers. What is the area of the rhombus?

Calculate the amount of heat needed to melt 182 g of solid ethanol (CH3CH2OH) and bring it to a temperature of -16.0°C. Round your answer to 3 significant digits. Also, be sure your answer contains a unit symbol.

Question 4 What stretching frequencies (in cm^-1) are present in the structure below? 1745 1800 1715

Which of the following carbonyls have a stretching frequency around 1745 cm^-1? Caution: More than one answer is possible. none of these

27. Which of the following should you use to extinguish a small fire in a beaker or flask? a) Water b) Fire extinguisher (Class A) c) A fire blanket or a lid d) None of the above 28. What should you do if you experience a chemical splash in your eye? a) Rinse with water immediately for at least 15 minutes and seek medical help b) Wait to see if the pain subsides c) Rub your eyes to alleviate the irritation d) Use an eye drop solution and continue working 29. Where is the emergency eyewash station located in most labs? a) Near the main entrance b) Next to the chemical storage area c) Near the sink or in a designated area d) In the storage closet with safety equipment 30. What should you do if you catch fire while in the laboratory? a) Run to the exit immediately b) Drop to the floor and roll to smother the flames c) Use a fire extinguisher to put out the flames d) Wait for the instructor to take care of the situation

Balance the entire chemical reaction using an atom inventory. Remember to balance each element in the reaction. Al + Cl2 -> AlCl3 When the equation is balanced, what is the coefficient for chlorine, Cl2?

How many barium atoms are in the compound below? Ba(MnO4)2

A student needs to determine the density of an irregularly shaped object. This student prepares a solution mixture where the object is suspended. The collected data is shown in the table below. Liquid Density (g/mL) Volume (mL) Glycerol 1.2610 4.57 Isopropanol 0.797 3.27 Determine the density of the object. Round your answer to 3 significant digits.

H3PO4 Express your answers using four significant figures. Enter your answers numerically separated by commas. mass % of H, P, O = %

Covalent bonds form salts, whereas ionic bonds form molecules. True False

A selenium ion ( Se^2- ) is in its ground state. How many electrons are in a neutral selenium atom? How many electrons are in a selenium ion ( Se^2- )? Complete the ground-state electron configuration of a selenium ion ( Se^2- ) using noble gas notation.

A chemistry student needs 25.0 g of ethanolamine for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of ethanolamine is 1.02 g/cm^(-3). Calculate the volume of ethanolamine the student should pour out.

Match the pH value on the left with the correct description on the right. (i) Instructions pH 7 pH 3 pH 11 basic (alkaline) neutral

A chemistry student must write down in her lab notebook the concentration of a solution of sodium thiosulfate. The concentration of a solution equals the mass of what's dissolved divided by the total volume of the solution. Here's how the student prepared the solution: - The label on the graduated cylinder says: empty weight: 9.050 g - She put some solid sodium thiosulfate into the graduated cylinder and weighed it. With the sodium thiosulfate added, the cylinder weighed 76.3 g . - She added water to the graduated cylinder and dissolved the sodium thiosulfate completely. Then she read the total volume of the solution from the markings on the graduated cylinder. The total volume of the solution was 124.99 mL . What concentration should the student write down in her lab notebook? Be sure your answer has the correct number of significant digits. g · mL^-1 × 10

A chemist needs to know the mass of a sample of aniline to 4 significant digits. He puts the sample on a digital scale. This is what the scale shows: If this measurement is precise enough for the chemist, round it to 4 significant digits. Otherwise, press the "No solution" button.

Experiments were done on a certain pure substance X to determine some of its properties. There's a description of each experiment in the table below. In each case, decide whether the property measured was a chemical or physical property of X, if you can. If you don't have enough information to decide, choose can't decide in the third column. property experiment physical or chemical? --------- 0 A sample of solid X is carefully weighed and put inside a vented flask. The flask is heated until oxygen gas starts being produced. After no more oxygen gas is produced, the contents of the flask are removed and weighed, and from the decrease in weight the value of O may be calculated. - O physical - O chemical - O (can't decide) R Into one chamber of an electrochemical cell, a solution of X is introduced, along with a metal electrode. In the other chamber a solution of a known oxidizing reagent O is introduced, along with another metal electrode The voltage across the electrodes is proportional to the tendency of O to react with X. By measuring this voltage, the value of R may be calculated. - O physical - O chemical - O (can't decide) E A thin sample of X is put between metal plates. A radio-frequency electric current is applied to the plates and passes through the sample. From the measured voltage across the plates the value of E may be calculated. - O physical - O chemical - O (can't decide)

Thé diagram shows three lines with some marked angle measures. Find the missing angle measures marked with question marks.

Al2O3(s) -> 2 Al(s) + 3/2 O2(g) ΔH° = 1675 kJ / molrxn Calculate the energy required to decompose 400 g of Al2O3. Answer in kJ.

Part B A covalent compound is composed of a nitrogen atom, a hydrogen atom, and a carbon atom. How many electrons should the Lewis structure of the covalent compound contain? Express your answer numerically as an integer. View Available Hint(s)

Chemical Reactions Identifying the correct sketch of a compound in aqueous solution Imagine a small amount of each compound in the table below is dissolved in water. Pick the sketch that best shows what the solution would look like, at the atomic level. The large number of faint red and white molecules in the background of each sketch represent the water solvent. Also, the colors of the solute atoms may not mean the same element in each sketch. For example, solute oxygen atoms could be colored yellow in the first sketch but blue in the second. Chlorine atoms could be colored blue in the first sketch but yellow in the second. And so on. Note for advanced students: the sizes of the atoms and any bond angles may not be accurate. compound pick a sketch OCl₃ (Drag the slider to choose an image) NH₃ (Drag the slider to choose an image)

1.5.2 Test (CST): Humans and the Environment Question 17 of 25 Which of these methods of commercial fishing is linked to excessive bycatch? A. Trolling B. Handline fishing C. Seining D. Long-line fishing SUBMIT

Identify the base SI unit for temperature. Kelvin Celsius Fahrenheit Centigrade

Carbon

Which of these is the BEST science question using the criteria we just learned? Does consuming food with higher salt content lead to poorer health outcomes in the form of high blood pressure? Which food has the lowest salt content? Which food is the healthiest? Is food with lower salt content healthier?

Learning Objective: Can you compare and contrast the different signaling pathways? Question: Interpret the model and determine if the following statement is true or false. True or False: If cortisol levels are low, the production of CRH will be low. True False

Write the elemental symbol for cobalt.

Write the name of the element family to which each of the elements in the following table belongs. Your answer should be a word or a short (2 or 3 word) phrase, with no numbers in it. element family strontium cesium

Consider the structure shown below: 1. One thing is incorrect about this Lewis structure. What is it? (5 pts) 2. Draw the correct Lewis structure for this compound (5 pts)

Copper(I) oxide can be oxidized to copper(II) oxide: Cu2O(s) + 1/2 O2(g) → 2 CuO(s) ΔHrxno = -146.0 kJ Given ΔHfo of Cu2O(s) = -146.0 kJ/mol, find ΔHfo of CuO(s). Be sure your answer has the correct number of significant figures. kJ/mol 18

What degree are these structures and is it vinyl or aryl

Calculate the value of [OH-] from the given [H3O+] in each solution and label the solution as acidic, basic, or neutral. Note: The ion product of water = 1.0 x 10^-14. [ [H3O+]=1.0 x 10^-3 M [OH-]= square M ] This solution is square (Choose one).

Identify the molecules or ions below as Lewis acids, Lewis bases, or neither. If there is more than one possible site in the molecule/ion, focus on the central or the charged atom. c) FeCl3

In the laboratory, a student dilutes 13.3 mL of a 11.8 M hydrobromic acid solution to a total volume of 150.0 mL. What is the concentration of the diluted solution? Concentration = M

Select all that apply Which of the following chemical symbols are correct? The chemical symbol for carbon is C. The chemical symbol for argon is Ar. The chemical symbol for iron is I. The chemical symbol for cobalt is CO.

Question 12 of 22 Translate each number into standard notation, maintaining the same number of significant figures. 4.52 × 10^3= 8.11 × 10^-2=

C2H6 lewis Structure

Calculate the pH for the following weak acid. A solution of HCOOH has 0.20 M HCOOH at equilibrium. The Ka for HCOOH is 1.8 x 10^-4. What is the pH of this solution at equilibrium? Express the pH numerically.

CIO2 is the chlorite anion. Once you have the anion named, the rules are as follows: 1. If the acid contains an anion with a name that ends in -ide, then change the -ide to For example: HCl is hydrochloric acid. 2. If the acid contains an anion with a name that ends in -ate, then change the -ate to For example: HNO3 is nitric acid. 3. If the acid contains an anion with a name that ends in -ite, then change the -ite to - For example: HClO2 is chlorous acid. (Note: Use of rule number 3 is far less common than rules 1 and 2.) What is the name of the acid with the formula HClO3? hydrochloric acid chlorous acid hydrochlorous acid chloric acid

5. Convert 4.5 μg (micrograms) to grams. 4.5 × 10^-6 g 6. Convert 3 mL to μL (microliters). 3000 7. Convert 80 μL (microliters) to milliliters. 0.08 8. Convert 0.8 mL to μL (microliters). 800

Part D Calcium's atomic number is 20, It forms ions with 18 electrons. What is the electrical charge of a calcium ion? +1 +2 -1 -2

Write the chemical formula for this molecule:

The only electrons that are important when considering bonding behavior are those in the shell. This shell is called the shell. middle, binding outermost; binding next to last; valence innermost; valence outermost; valence

N2^2=2.1767 times 10^-18 / 5.4471 times 10^-19

Alternative energy sources like solar and wind power a. are always available b. are only replenished with human intervention c. are renewable d. are more versatile than fossil fuels

Which lipid class is utilized to transmit signals locally? Steroids Polyunsaturated cis-fatty acid triglycerides Saturated triglycerides Eicosanoids Ketones

Multiple Choice Question Solution A has a pH of 2. It is basic neutral acidic

For each of the following transactions that occur in their lives, identify whether it is included in the calculation of U.S. GDP as part of consumption (C), investment (I), government purchases (G), exports (X), or imports (M) : Check all that apply. Transaction The Pennsylvania Department of Transportation, a state administration, repairs a bridge along PA highway 23, which feeds into the center of Conshohocken. Frances gets a new smart bird feeder made in the United States. Frances's father in Mexico orders a Martin guitar, made in Pennsylvania, from the producer's website. Dmitri's employer upgrades all of its computer systems using U.S.-made parts. Dmitri buys a bottle of French champagne.

An atom or molecule that has gained or lost electrons is called a(n) □

NOTICE! Travelers intending to embark on the Atlantic voyage are reminded that a state of war exists between Germany and her allies and Great Britain and her allies; that the zone of war includes the waters adjacent to the British Isles: that, in accordance with formal notice given by the Imperial German Government, vessels flying the flag of Great Britain, or any of her allies, are liable to destruction in those waters and that travelers sailing in the war zone on ships of Great Britain or her allies do so at their own risk. IMPERIAL, GERMAN EMBASSY, Washington, D. C., April 22, 1915. Source: New York Times, May 1, 1915 (adapted) Which technological innovation of World War I is most closely associated with this German notice? A) tanks B) airplanes C) submarines D) machine guns 9. The immediate cause of World War I was the A) assassination of Archduke Ferdinand B) Japanese alliance with Germany C) treaty agreement at Versailles D) German invasion of Poland

Select the correct answer. What happens when an electron absorbs energy? A. The electron moves from a lower energy orbital to a higher energy orbital. B. The electron falls into the nucleus. C. The electron moves from a higher energy orbital to a lower energy orbital. D. The electron loses its charge.

Select the correct answer. Which subatomic particle has negligible mass and travels around outside the nucleus? A. proton B. neutron C. electron D. orbital

What do all of the elements below have in common?

The nurse is reinforcing medication instructions to a client with peptic ulcer disease. Which represents correct information given by the nurse? (1) Antacids coat the lining of the stomach. 2 Omeprazole will coat the ulcer to help it heal. 3 Sucralfate changes the acidity of fluid in the stomach.

Identify the Electron Configuration for Aluminum (Al) 1s^2 2s^2 2p^6 3s^2 3p^1 1s^2 2s^2 2p^6 3s^2 4p^1 1t^2 2p^2 2p^6 3f^2 3p^3

Rate the molar enthalpies of vaporization of the following substances in increasing order: CH₄, C₂H₆, and C₃H₈. CH₄<C₂H₆<C₃H₈ C₃H₈<CH₄<C₂H₆ C₂H₆<CH₄<C₃H₈ CH₄<C₃H₈<C₂H₆

Part D Which of the following is the driving force for the sodium-potassium pump? a concentration gradient an electrical gradient ATP hydrolysis a hydrostatic pressure gradient

A scientific law Multiple Choice is an educated guess. is an absolute truth. is a generalization based upon experiments or observation. represents the majority opinion of scientists in a vote.

Question 11 Which trade barrier is being utilized if the United States prohibits the importation of paint that contains lead? 0 tariff subsidy quota standard

The allows the FDA to regulate the safety of cosmetics as well as drugs. The defined what are, how they may be used, and how they may be obtained. Prior to the , drug manufactures did not have to show that their drugs treated the conditions they claimed. are held to a high standard for safety because they are not taken with the supervision of a Controlled substances Over-the-counter drugs Placebos Prescription drugs

Types of Chemical Reactions Decomposition Reaction - AB → A+B - Example: HgO → Hg+O2 How many oxygen do you have in the REACTANTS/PRODUCTS side respectfully? 1 / 1 2/1 2 / 2 1/2

Part D Cs with atomic number 55 and mass number 137 Enter your answers as integers separated by commas. Np, Nn, Ne= Part E Pt with atomic number 78 and mass number 194 Enter your answers as integers separated by commas. Np, Nn, Ne=

Complete the table below, using the diagram of an atom shown at right. name symbol charge (in multiples of e) approximate mass (amu) location on diagram -------------------------------------------------------------------------------------------- neutron (1) (choose one) v (choose one) c e- (choose one) c (choose one) ~ proton (choose one) ~ (choose one) v

織維の強度を強めるため，ある化学的処理方法が開発された。この処理を施した 8本の綫維と，処理を施さなかった 6 本の織維の強度を調べたところ，以下のような結果を得た。処理あり処理なし標本数 8 6 標本平均 563 519 標本分散 1006 1736 この科学的処理方法が有効かどうかを調べるため，処理あり，処理なしの場合の強度の母分散は等しいと想定して，有意水準 1% の検定 H0: μ1-μ2=0 v.s. H1: μ1-μ2>0 を行う。ここに，μ1, μ2 はそれぞれ処理あり，処理なしの場合の強度の母平均を表している。（1）共通の母分散の推定量の値 s^2 を，小数第 3 位まで求めよ．（2）検定統計量の値 t を，小数第 2 位まで求めよ．（3）㤲却域は t t>1 である．イに入る数値を求めよ。（4）この検定の結論を述べよ。

Which of the following equations best represents the chemical changes that occur during ocean acidification? A CO2 + Ca+ + CO3 2- → CaCO3 (B) 6 CO2 + 6 H2 O → C6 H12 O6 + 6 O2 (C) CO2 + H2 O → 2 H+ + CO3 2- (D) CH4 + 2 O2 → CO2 + 2 H2 O

What are atoms like? Select True or False to correctly classify each statement about atoms. - Every element is made of its own type of atoms. True False - All atoms are too small to be seen with the unaided eye. - All atoms are made of even smaller particles. - A compound has the same properties as the atoms that form it. - A molecule is the name for a very large atom.

5. The granola bar contains 520 mg of sodium. What should be listed under the % Daily Value for this nutrient? a. 52% b. 46% c. 100% d. 23% e. 26% 6. Which health claim would require FDA approval before appearing on the granola bar box? a. "Supports heart function." b. "Promotes healthy blood vessels." c. "A disease diet low in total fat may reduce the risk of some cancers." d. "Encourages improved heart health." e. "Maintains a healthy heart"

description Does any element with Z ≤ 92 match the description? If you checked yes, give the symbol of an element with Z ≤ 92 that matches. --------- An element in Period 5 and Group 1A. Yes No Rb A semimetal in Group 8A. Yes No

A scientist claims that 4% of viruses are airborne. If the scientist is accurate, what is the probability that the proportion of airborne viruses in a sample of 662 viruses would be greater than 6%? Round your answer to four decimal places.

Which of the following statements about renewable and nonrenewable energy sources is true? Much of the energy used to power day-to-day activities is in the form of chemical energy. Coal produces 39% of the country's heating and transportation fuel. Nonrenewable energy can be replenished in a relatively short amount of time. In the United States, about 20% of energy comes from renewable energy.

Balance the following equation. What is the coefficient in front of water? Methane and oxygen --> carbon dioxide and water

How many molecules are in 89.0 g of tetraphosphorus decoxide? 2.59 × 103 1.89 × 10^23 7.19 × 10^31

Which molecule, composed of adenine, ribose, and three phosphate groups, functions as an energy-transfer molecule? Adenosine triphosphate Triglyceride Cyclic adenosine monophosphate Cholesterol

Mc Graw Hill 36 of 103 Concepts completed (i) Multiple Choice Question The amount of energy needed to raise the temperature of 1 gram of water by 1 degree Celsius is called a kilocalorie. a joule. a calorie. Need help? Review these concept resources.

Name the type of bond that holds amino acids together in a protein molecule. Peptide bond Hydrogen bond Ionic bond Phosphodiester bond

Tests that take place in the lab, such as in a test tube or Petri dish, outside of a living host, are referred to as whereas tests that take place in a living host, such as in a patient, are described as - Multiple Choice in vitro; in loco in loco; in vivo in vitro; in vivo in loco; in vitro

Predict the missing component in the nuclear equation. [ 94^239 mathrmPu rightarrow mathrmX+2^4 mathrmHe ] [ 92^235 mathrmU ] [ 92^235 mathrmNp ] [ 92^235 mathrmAm ]

When moving from left to right across a period, ionization energy is increasing? By which other trend is this caused? a) Increase of electrical conductivity b) Decrease of atomic radius c) Less electrons in the outer shell d) Decrease in atomic mass

The orbits of the eyes are formed by . cranial bones only facial bones only several facial and cranial bones

Homework-7 Chapter 19 20 Question 6 of 16 (1 point) Question Attempt: 1 of Unlimited Part 1 of 2 Name the highlighted functional group. group amino acid

Reaction of a ketone with 2 moles of an alcohol will produce which one of the following functional groups? An alcohol An acetal A gem diol

Decide whether each pair of elements in the table below will form an ionic compound. If they will, write the empirical formula of the compound formed in the space provided. element #1 element #2 Forms ionic compound? empirical formula of ionic compound --- --- --- --- rubidium Iodine yes fluorine sodium yes oxygen bromine yes oxygen sodium yes

Items (4 items) (Drag and drop into the appropriate area) NaF NaI NaCl NaBr

What is the name of S2O3? Capitalize the first word, space, lowercase the second word. Spelling counts!

Identify the number of atoms found in each chemical below: Al2(NO3)3 lithium atom(s) carbon atom(s) oxygen atom(s) ? aluminum atom(s) nitrogen atom(s) oxygen atom(s)

23 of 103 Concepts completed Multiple Choice Question What forms when two or more atoms bond together? a molecule an atomic nucleus an element an orbital (3) Need help? Review these concept resources. Rate your corifidence to submit your answer. High Medium Low Reading O 2025 McGraw Hill. All Rights Reserved. Privacy Center Terms of Use MacBook Air

Which is the thermodynamic enolate of 2-methylcyclohexanone? I II III IV Multiple Choice IV

What is the chemical formula for Fe2O3?

A solution is prepared at 25°C that is initially 0.86 M in propanoic acid (HC2H5CO2), a weak acid with Ka=1.3 x 10^-5, and 1.2 M in potassium propanoate (KC2H5CO2). Calculate the pH of the solution. Round your answer to 2 decimal places. pH=

Question 2 (1 point) Lemon juice has a pH=2 and Drano has a pH=9, which one contains more hydrogen ions? A) Lemon juice B) Tomato juice

Chemical formulas can have three components. a) The element symbols, which are represented by a single uppercase letter, or by an uppercase letter followed by a lowercase letter, tell you the types of elements in the compound. b) The subscript numbers written on the right-hand side of each element symbol. This tells you the number of atoms of this element in the molecule. If an element symbol has no subscript next to it, it means there is one atom of that element in the molecule. c) The charge symbols which surround some groups of atoms indicated by a superscript number and sign on the right-hand side of that bracket. The charge numbers of all of the atoms inside the bracket need to be considered. Record the number of each atom in each molecule, then record the total number of atoms in the molecule.

9) C8H18 + O2 → CO2 + H2O 10) FeCl3 + NaOH → Fe(OH)3 + NaCl 11) P + O2 → P2O5

Write the chemical symbol for the following element: 16 Protons, 18 Electrons, 17 Neutrons

Anhydrides are more reactive than acid chlorides, but less reactive than other carboxylic acid derivatives.

In the following equation for a chemical reaction, the notation (s), (l), or (g) indicates whether the substance is in the solid, liquid, or gaseous state. Fe₂O₃(s) + 3H₂(g) + energy → 2Fe(s) + 3H₂O(g) Identify each of the following as a product or a reactant: H₂(g) H₂O(g) Fe(s) Fe₂O₃(s) When the reaction takes place energy is The reaction is Submit Answer Study Entire Group

What was transferred from the hydrochloric acid to the water molecule? a) An electron b) H^+ c) A hydrogen atom d) A water molecule

b. If this mass were dissolved in 1.00 L of water, what would the molarity of the solution be?

If capillary hydrostatic pressure increases, then the likelihood of edema increases.

Question 25 2 pts When neutralizing acids using a sodium bicarbonate extraction, why do you have to vent the separatory funnel immediately after inversion with the liquid mixture present inside? To remove impurities from the mixture To introduce oxygen and enhance extraction To prevent excessive pressure inside the seperatory funnel due to gas build up there is actually no need to vent

Which statement describes an ionic bond? A. Electrons are transferred from one atom to another. B. Electrons are mobile within a metal. C. Electrons are shared between atoms. D. Electrons transition from an inner shell to a valence shell.

Which step of the titration curve uses the given calculations to determine the pH ? After the equivalence point At the half-equivalence point At the equivalence point Before any titrant is added

Question 12 (5 points) Review question #8-4: Using above balances two chemical equations from question 9 (Review question #8-1) and result from question 11 (Review question #8-3): A reaction container holds 5.33 g of P4 and 3.77 g of O2 and reaction A occurs. If enough oxygen is available then the P4O6 reacts further to undergo reaction B. If 7.12 g of P4O6 were obtained what is the percent yield (%)? 95.1 121 75.3 82.4

How do compounds with no unpaired electrons interact with external magnetic fields? Select the correct answer below: They are weakly attracted by magnetic fields. They are weakly repelled by magnetic fields. They are not affected by magnetic fields. They can gain unpaired electrons, becoming attracted to the magnetic field.

Which two electron configurations represent elements that would have similar chemical properties? (1) 1s^2 2s^2 2p^4, (2) 1s^2 2s^2 2p^5, (3) [Ar] 4s^2 3d^10 4p^3, (4) [Ar] 4s^2 3d^10 4p^4 Select one: A. (1) and (3) B. (1) and (2) C. (1) and (4) D. (2) and (4) E. (2) and (3)

Which of the following is the empirical formula for hexane, C6H14? Select one: A. C0.43H B. C6H14 C. C12H28 D. CH2,3 E. C3H7

Tammy, who turns eighty years old this year, has just learned about blood pressure problems in the elderly and is interested in how her blood pressure compares to those of her peers. She has uncovered an article in a scientific journal that reports that the mean systolic blood pressure measurement for women over seventy-five is 132.1 mmHg, with a standard deviation of 6.5 mmHg. Assume that the article reported correct information. Complete the following statements about the distribution of systolic blood pressure measurements for women over seventy-five. (a) According to Chebyshev's theorem, at least (Choose one) of the measurements lie between 119.1 mmHg and 145.1 mmHg. (b) According to Chebyshev's theorem, at least 8/9 (about 89%) of the measurements lie between mmHg and mmHg. (Round your answer to 1 decimal place.)

Nitromethane (CH3NO2) burns in air to produce significant amounts of heat. 2 CH3NO2(l) + 3 / 2 O2(g) -> 2 CO2(g) + 3 H2O(l) + N2(g) ΔHrnn^ρ = -1418 kJ How much heat is produced by the complete reaction of 5.56 kg of nitromethane?

Metals are the largest of the three classes of elements. TRUE FALSE

HNO3 + S → H2SO4 + NO You now have these half-reaction equations: 3 e^- + HNO3 → NO S → H2SO4 + 6 e^- Which factor will you use for the top equation? Which factor will you use for the bottom equation?

Add the appropriate coefficient to balance the following chemical equations. 16. Cu(NO3)2(aq) + NaOH(aq) -> Cu(OH)2(s) + NaNO3(aq) 17. H3PO4(aq) + KOH(aq) -> H2O(l) + K3PO4(aq)

Which of the following is associated with metabolic syndrome? low triglycerides high HDL insulin resistance low blood pressure

Describe Functions of Buffers Complete the sentences describing the functions of buffers. 1. Chemical buffers are compounds that will bind (Click to select) when they are in abundance in a solution. This prevents an unwanted drop in pH. 2. Chemical buffers are also able to add (Click to select) to a solution if the pH starts to get too high.

Question 1 (5 points) Review question #1-1: Consider the following redox reaction: Cu(s) + 4 HNO3(aq) à Cu(NO3)2(aq) + 2 NO2(g) + 2 H2O(l) If 5.48 g of Cu are allowed to react with excess HNO3, what is the theoretical yield (g) of Cu(NO3)2 in grams?

What was the 1986 earthquake in California, along the San Andreas Fault, an example of?

Use substitution to determine whether the given ordered pairs are solutions of the given equation. [ (-frac56,-frac47), (0, frac67) ; 6 a+7 b=6 ] Is the ordered pair (-frac56,-frac47) a solution of the equation 6 a+7 b=6 ? Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. No because after substituting for a and b, it gives the result neq 6. (Type an integer or a simplified fraction.) B. Yes because after substituting for a and b, it gives the result 6=6.

Question 29 (0.5 points) The following chemicals are involved in electron transport. Which of these chemicals has the strongest pull on electrons? O2 FADH2 NADH ubiquinone Question 30 (0.5 points) Which term refers to cellular respiration that occurs in the presence of oxygen? catabolic respiration anaerobic respiration fermentation aerobic respiration

Use the References to access important values if needed for this question. It is often necessary to do calculations using scientific notation when working chemistry problems. For practice, perform each of the following calculations. 9.24 × 10^5 + 4.15 × 10^4 = (7.62 × 10^-4 + 1.00 × 10^-8) / (1.86 × 10^-4) = 4.58 × 10^6 / ((9.24 × 10^5)(4.15 × 10^4)) = Submit Answer Retry Entire Group 4 more group attempts remaining

What reagents are necessary to perform the following reaction? → Multiple Choice O₃ H₂, Lindlar's Na, NH₃ KMnO₄

What is the value of the bond angles in COH2? Enter the bond angle of the molecule. What is the value of the bond angle in ICl2-? Enter the bond angle of the molecule.

Write the complete ground-state electron configuration of magnesium.

What does homogeneous mean? What do you think this means for the appearance of the solutions that you will use? The mass of a volumetric flask is 40.638 g. After adding 15.0 mL of 95% ethanol and adding enough water to complete the volume to 50.00 mL, the flask weighed 88.219 g. What is the density of the mixture?

The main advantage of fixed I / O is; Lower cost Increased flexibility Greater selection of modules Faster replacement of I/O modules

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