Chemistry Homework Questions & Answers Archive

Find all asymptotes, x-intercepts, and y-intercepts for the graph of the rational function and sketch the graph of the function. f(x) = (5-x^2)/(x^2-36) Find all vertical asymptotes. Select the correct choice below and, if necessary, fill in the answer box(es) within your choice. A. The equation of the vertical asymptote is □ (Type an equation.) B. There are two vertical asymptotes. The leftmost asymptote is □ The rightmost asymptote is □ (Type equations.) C. There are no vertical asymptotes.

Which of the statements are true? Fats that contain more saturated fatty acid residues than unsaturated fatty acid residues are more likely to be solid at room temperature. Saturated fats have lower melting points than unsaturated fats. Triacylglycerols (triglycerides) contain ester bonds. Triacylglycerols (triglycerides) are carboxylic acids. Unsaturated fats are more likely than saturated fats to be liquid at room temperature.

Give the IUPAC name for the following compound. (A) (E,R)-2-bromo-3-pentenoic acid (B) (Z,R)-2-bromo-3-pentenoic acid (C) (E,S)-2-bromo-3-pentenoic acid (D) (Z, S)-2-bromo-3-pentenoic acid

General purpose media are characterized by allowing the growth of a broad range of microbes.

Multiple Choice Question What name is given to an atom or group of atoms within a molecule that is largely responsible for the properties and reactivity of the molecule? Polyatomic group Functional group Reactive group Organic group

When looking at an aqueous solution of a weak base, a higher pH corresponds to: Select the correct answer below: a higher concentration of hydronium a less concentrated solution a higher concentration of hydroxide a more dilute solution

Which atom should be larger? Francium (Fr), Barium atom (Ba), Barium ion (Ba+2), Uranium (U)

A lamp has two light bulbs with an average lifespan of 1000 hours. Assuming we can model the probability of failure of these bulbs by an exponential density function with mean μ=1000, find the probability that both of the lamp's bulbs fail within 500 hours. Express the answer as a decimal rounded to four decimal places.

Identify the reaction type for the following reaction. 2 H2O(l) → 2 H2(g) + O2(g) single-displacement double-displacement decomposition synthesis

Balance the given chemical reaction. Al2(SO4)3(aq) + KOH(aq) -> Al(OH)3( s) + K2 SO4(aq) balanced equation:

Enter the elements in the order: C, H, O Using only the information found within the chemical equation, determine the molecular formula of methane + 2O₂ → CO₂ + 2H₂O

Chapter 4 Question 46 - Multiple Choice What is the charge on the ion formed by aluminum? 3+ none of the above

Tin (Sn) exists in Earth's crust as SnO2. Calculate the percent composition by mass of O and Sn in SnO2. Round your answer to 4 significant digits. Part 1 of 2 %O

Fill in the name and empirical formula of each ionic compound that could be formed from the ions in this table: Some ionic compounds cation anion empirical formula name of compound Pb^2+ I^- Pb^4+ I^- K^+ I^- Ca^2+ I^-

Identify the solutions that will form a precipitate when mixed with aqueous sodium carbonate, Na2CO3(aq). Check all that apply. Note: Reference the Solubility of ionic compounds in water table for additional information. copper(II) nitrate, Cu(NO3)2(aq) sulfuric acid, H2SO4(aq) silver nitrate, AgNO3(aq) sodium chloride, NaCl(aq) potassium carbonate, K2CO3(aq) sodium hydroxide, NaOH(aq) None of the above

vledge Library courses/1530/welcome-to-popeyes/lessons/26750:3588/module-1-section-3-maintaining-your-restaurant ig your Restaurant ining Your Restaurant A car in the drive-thru has leaked oil. Which chemical best cleans this mess? Glass Cleaner Degreaser Bathroom Cleaner Sanitizer SUBMIT Search

2 C2H2(g) + 5 O2(g) → 4 CO2(g) + 2 H2O(g) NO=

KOH + H3PO4 → K3PO4 + H2O

Calculate ΔHrxn for the following reaction: SrO(s) + CO2(g) → SrCO3(s) Use the following reactions and the given values of ΔH for them: Sr(s) + CO2(g) + 1/2 O2(g) → SrCO3(s), ΔH = -819.5 kJ 2 Sr(s) + O2(g) → 2 SrO(s), ΔH = -1096.0 kJ Express the enthalpy change in kilojoules to four significant figures.

The figure to the right shows the results of a survey in which 1000 adults from Country A, 1005 adults from Country B, 1019 adults from Country C, 996 adults from Country D, and 997 adults from County E were asked whether national identity is strongly tied to birthplace. National Identity and Birthplace People from different countries who believe national identity is strongly tied to birthplace Country A 30% Country B 22% Country C 25% Country D 54% Country E 13% Construct a 99% confidence interval for the population proportion of adults who say national identity is strongly tied to birthplace for each country listed. The 99% confidence interval for the proportion of adults from Country A who say national identity is strongly tied to birthplace is (0.263,0.337). (Round to three decimal places as needed.) The 99% confidence interval for the proportion of adults from County B who say national identity is strongly tied to birthplace is (0.186,0.254). (Round to three decimal places as needed.) The 99% confidence interval for the proportion of adults from County C who say national identity is strongly tied to birthplace is (0.215,0.285). (Round to three decimal places as needed.)

A chemist dissolves 60 mg of pure sodium hydroxide in enough water to make up 70 mL of solution. Calculate the pH of the solution. (The temperature of the solution is 25 °C.) Be sure your answer has the correct number of significant digits.

13. A sealed tank contains the following mixture of gases: 2.0 grams of helium, 48.0 grams of oxygen, 14.0 grams of nitrogen, 64.0 grams of disulfur trioxide, and 9.0 grams of hydrogen gas. If the total pressure is 800.0 kPa , then find the partial pressure of each gas in atmospheres.

Calcium carbonate frequently deposits in home water pipes. Should a homeowner expect more CaCO3 buildup in hot water pipes or cold water pipes? Briefly explain.

An atom of the isotope chlorine-37 consists of how many protons, neutrons, and electrons? (p= proton, n= neutron, e= electron) 18 p, 37 n, 18 e 17 p, 20 n, 17 e 17 p, 20 n, 18 e 37 p, 37 n, 17 e 37 p, 20 n, 37 e

Complete the following sentences. Part: 0 / 2 Part 1 of 2 random variables can take on any value in an interval. Discrete Categorical Continuous Qualitative

Write the IUPAC names for the following two structures:

What is the product of the following reaction?

PbBr2 soluble insoluble Ni(OH)3 soluble insoluble Bi(NO3)3 soluble insoluble

(ln(high[OH^-])/ln(low[OH^-]))/(ln(slope of proper order plot with high[OH^-])/ln(slope of proper order plot with low[OH^-]))

Green plants use light from the Sun to drive photosynthesis. Photosynthesis is a chemical reaction in which water (H2O) and carbon dioxide (CO2) chemically react to form the simple sugar glucose (C6H12O6) and oxygen gas (O2). What mass of oxygen gas is produced by the reaction of 8.5 g of carbon dioxide? Be sure your answer has the correct number of significant digits. g × 10

Determine the density of NH3 gas at 435 K and 1.00 atm. A) 0.851 g / L B) 0.321 g / L C) 0.477 g / L D) 2.10 g / L E) 2.24 g / L A sample of nitrogen gas had a volume of 500 mL, a pressure in its container of 740 Torr, and a temperature of 25°C. What was the new volume of the gas when the temperature was changed to 50°C and the new pressure was 760 Tom? A) 528 mL B) 408 mL C) 244 mL D) 452 mL E) 976 mL

Calculate the concentrations of each ion present in a solution that results from mixing 39.4 mL of a 0.72 M NaClO3(aq) solution with 73.5 mL of a 0.68 M Na2SO4(aq). Assume that the volumes are additive. - M ClO3^- - M SO4^2- - M Na+

Mannitol, a carbohydrate, is supplied as a 25% (w/v) solution. This hypertonic solution is given to patients who have sustained a head injury with associated brain swelling. What volume should be given to provide a dose of 34 g ? Be sure your answer has the correct number of significant figures. mL 100

Is the overall reaction endothermic or exothermic?

Water vapor is added to a cylinder containing 0.39 atm of nitrogen and 0.19 atm of oxygen to give a total pressure of 0.94 atm of gas. What is the partial pressure of each gas in the final mixture? Be sure each of your answer entries has the correct number of significant figures. Part 1 of 3 PN2= atm Part 2 of 3 PO2= atm Part 3 of 3 PH2O= atm

프로판 (C3H8) 과 수소 (H2) 가 75 몰%와 25 몰%인 혼합 가스가 25 % 초과 공기에서 연소되었다. C3H8 과 H2 의 전환율이 각각 90 % 와 85 % 이었다. 반응한 C3H8 의 95 % 는 CO2 를 생성하였고, 나머지는 CO 를 생성하였다. 원소 기준으로 질량 수지를 계산하시오. a) 연소 반응식 (4점) b) 흐름도 작성 및 자유도 분석 (4점) c) 이론적 산소량 (4점) d) 연소가스 총 몰수 (4점) e) CO 농도(ppm) (4점)

Both water and sulfur dioxide are products from the reaction of Sulfuric acid (H2SO4) with Copper metal as shown 2 H2SO4 + Cu -> SO2 + 2 H2O + CuSO4 How many grams of H2O will be produced at the same time that 10 grams of SO2 is produced

Which of the following compounds upon hydrolysis would yield CH3CH2OH and CH3CH2CHO?

EXPERIMENT 6. Analysis of Vinegar Post-Lab Questions: The federal government defines vinegar as a solution with a minimum of 40 grams of acetic acid per liter of vinegar. 1. Calculate the mass percentage of acetic acid that must be in vinegar. Assume vinegar has a density of 1.00 g / mL. 2. Does the vinegar that you tested comply with federal guidelines?

An analytical chemist weighs out 0.051 g of an unknown monoprotic acid into a 250 mL volumetric flask and dilutes to the mark with distilled water. He then titrates this solution with 0.0600 M NaOH solution. When the titration reaches the equivalence point, the chemist finds he has added 14.2 mL of NaOH solution. Calculate the molar mass of the unknown acid. Round your answer to 2 significant digits. g/mol

The change in state from liquid to solid is called . a.) condensation b.) freezing c.) melting d.) sublimation

What are the intermolecular forces present between these two molecules? (B) Hydrogen Bonds (C) Dipole-Dipole Attractions (D) Covalent Bonds

Consider the following unbalanced particulate representation of a chemical equation: N = blue O = red Write a balanced chemical equation for this reaction, using the smallest integer coefficients possible. Do not include states.

Calculating an equilibrium constant from a heterogeneous equilibrium Ni(CO)4(g) ⇌ Ni(s) + 4CO(g) At a certain temperature, a 3.76 L reaction vessel containing a mixture of nickel carbonyl, nickel, and carbon monoxide at equilibrium has the following composition: Ni(CO)4 0.277 g Ni 10.0 g CO 1.96 g Calculate the value of the equilibrium constant, Kc, for this reaction. Round your answer to 3 significant digits.

12:06 AM Sun Oct 20 learning.mheducation.com Done AA Multiple Select Question Select all that apply What can happen during the reduction of an atom or molecule? One or more electrons are added to the atom or molecule. The net charge of the atom or molecule decreases due to addition of negatively charged electron(s). The net charge of the atom or molecule increases due to addition of negatively charged electron(s). One or more electrons are removed from the atom or molecule. Need help? Review these concept resources. Rate your confidence to submit your answer. High Medium Low 2024 McGraw Hill. All Rights Reserved. Privacy Center Terms of Use

If 42 grams of sodium hydroxide is dissolved in enough water to make a 0.75 L solution. What is the resulting molar concentration?

35.0 mL of 0.255 M nitric acid is added to 45.0 mL of 0.328 M Mg(NO3)2. What is the concentration of nitrate ion in the final solution?

Write the molecular equation for the reaction of copper metal with aqueous silver nitrate. Include physical states.

Analysis of pH measurements of solutions after the addition of NaOH Initial pH pH after 5 drops NaOH pH after 10 drops NaOH Total pH change Buffer (Y or N) --- --- --- --- --- --- H2O 5.60 11.50 11.80 -6.1 Choose. Choose... 0.1 M NaCl 6.39 12.19 12.52 -6.1 Choose... Choose... High pH buffer 9.92 10.07 10.17 -0.2 Choose... Choose... Low pH buffer 4.15 4.62 4.86 -0.6 Choose... Choose..

If atoms with the electron-dot symbols shown below are combined, what is the formula of the onic compound that is formed? X · Ÿ.

What is the concentration (M) of a NaCl solution prepared by dissolving 9.3 g of NaCl in sufficient water to give 350 mL of solution? (A) 18 (B) 0.16 (C) 0.45 (D) 27 (E) 2.7 x 10^-2

Which one of the following is a diprotic acid? (A) nitric acid (B) chloric acid (C) phosphoric acid (D) hydrofluroric acid (E) sulfuric acid

Atomic mass has a decimal because it is the average of all the isotopes for a particular element. The atomic number of an element is the number of in its nucleus. A number of electrons; protons B mass; protons C mass; neutrons D protons; neutrons

Compound A reacts with Compound B to form only one product, Compound C, and it's known the usual percent yield of C in this reaction is 69%. Suppose 9.5 g of A are reacted with excess Compound B, and 10.0 g of Compound C are successfully isolated at the end of the reaction. What was the theoretical yield of C? Round your answer to the nearest 0.1 g. How much B was consumed by the reaction? Round your answer to the nearest 0.1 g.

What is the IUPAC name of the substance shown in the following line drawing?

How many moles of Ag are in 47.6 grams of Ag2O?

situation chemical reaction? chemical equation --- --- --- A strip of solid silver metal is put into a beaker of 0.057 M Cu(NO3)2 solution. yes no A strip of solid copper metal is put into a beaker of 0.084 M AgNO3 solution. yes

Provide the correct IUPAC name for Cr2O3.

The covalent bond between chlorine and iodine is a polar one. Which of the following properly represents the direction of polarity in this bond? -Cl-1+ +Cl^-- δ-Cl^δ+ δ+ δ+ Cl-1 δ-

How many grams of sodium Fluoride are in 700 mL of 3.0 M of solution of sodium fluoride, NaF Molar mass = 42 g / mol? (A) 88 g (B) 67 g (C) 9.8 g (D) 2.1 g (E) 26 g

A reaction in which two aqueous solutions combine to form a solid (insoluble) product is called a reaction.

A student sets up and solves the following equation to solve a problem in solution stoichiometry. Fill in the missing part of the student's equation. (0.36 (1 mL / 10^-3 L)(1.26 g / mL)) / (65.37 g / mol) = 6.9 mol

Select all that apply What are the two chemical categories of endocrine hormones? Neurohormones Bound Free Water-soluble Lipid-soluble

mass of the resulting strontium fluoride precipitate. mass: 8 Assuming complete precipitation, calculate the final concentration of each ion. If the ion is no longer in solution, enter a 0 for the concentration. [Na+] = M [NO3] = M [St^2] = M [F-] = M

Question 10 1 pts Select all TRUE statements. Chiral resolution is necessary separate a mixture of diastereomers. Chiral mixtures of products can only be synthesized from chiral starting materials. Achiral reagents can lead to chiral products but it will be an achiral mixture.

If the half-life of I-131 is 25.4 days, how many moles of I-131 would be left in Mr. Miller's body after 68 days if he was infused with 5.6 grams? (Round your answer to four decimal places)

How many chiral atoms are in the following molecule?

Which of the following is true of the ionization energy of the elements? a) Ionization energy generally decreases as we move left to right and decreases as we move top to bottom in the periodic table. b) Ionization energy generally decreases as we move left to right and increases as we move top to bottom in the periodic table. c) Ionization energy generally increases as we move left to right and decreases as we move top to bottom in the periodic table. d) Ionization energy generally increases as we move left to right and increases as we move top to bottom in the periodic table.

1. How many moles of acetate ions are present in a sample that contains 4.05 moles of chromium(II) acetate, Cr(CH3COO2) ? moles CH3COO^- 2. How many moles of Cr(CH3COO)2 are present in a sample that contains 3.41 moles of acetate ions? moles Cr(CH3COO)2

A chemistry student needs 75.0 g of 2-ethyltoluene for an experiment. She has available 0.50 kg of a 40.5% w / w solution of 2-ethyltoluene in acetone. Calculate the mass of solution the student should use. If there's not enough solution, press the "No solution" button. Round your answer to 3 significant digits.

Question 37 1 pts If a probation officer checks self-reports of drug use with urine tests she is using: Face validation Discriminant validation Construct validation Criterion validation

A 21.33 mL solution containing 1.607 g Mg(NO3)2 is mixed with a 32.75 mL solution containing 1.137 g NaOH. Calculate the concentrations of the ions remaining in solution after the reaction is complete. Assume volumes are additive. If a species fully precipitates, type 0. Be sure your answer has the correct number of significant digits. M Mg2+ M NO3- M Na+ M OH-

NH2 H H-C-H H

When performing a titration, the substance of unknown concentration is called: Select the correct answer below: analyte titrant acid base

A hormone binds a receptor and activates the CAMP signal transduction pathway ultimately leading to the cell response. If you wanted to develop a drug to block this pathway, the drug would need to inhibit phosphodiesterase, protein phosphatases remove phosphates from proteins initially activated by protein kinase A, adenylyl cyclase, hormone release from the receptor.

5. Iron(III) ions are changed into iron(II) ions with different reducing agents in Part II. What did you observe when potassium ferricyanide is mixed with the iron(II) ion? What did you observe when potassium ferricyanide is mixed with the iron(III) ion?

What is the common name of the following compound?

The primary intent of DNA technology is to improve the genetic material from one organism

In a certain chemical reaction Compound A combines with Compound B to produce Compound C (and no other products). Measurements were taken of the amounts of A and B present before and after a reaction that produced some C: Compound initial amount final amount A 1.5 g 0 g B 1.5 g 1.0 g Calculate the theoretical yield of C. Round your answer to the nearest 0.1 g. Suppose the percent yield of C in this reaction was 56%. Calculate the actual amount of C that was isolated at the end of the reaction. Round your answer to the nearest 0.1 g.

Select all of the following reactions that produce a precipitate. Check all that apply. Note: Reference the Solubility of ionic compounds in water table for additional information. - BaCl2(aq) + H2SO4(aq) → - NaOH(aq) + HCl(aq) → - KCH3CO2(aq) + FeBr3(aq) → - Zn(s) + CuSO4(aq) → - KOH(aq) + Pb(CH3CO2)2(aq) → None of the above

Write the equilibrium constant expression, (K), for the following reaction. Please enter the compounds in the order given in the reaction. If either the numerator or denominator is blank, please enter 1 ((mathrmCH3)3 mathrm~N(mathrmaq)+mathrmH2 mathrmO(mathrml) rightleftharpoons(mathrmCH3)3 mathrmNH^+(mathrmaq)+mathrmOH^-(mathrmaq)) (K=) Submit Answer Retry Entire Group 9 more group attempts remaining

Calculate the mass in grams of 1.13 mol of KMnO4. Be sure your answer has the correct number of significant figures. g KMnO4 × 10

Study this chemical reaction: Pt + O2 -> PtO2 Then, write balanced half-reactions describing the oxidation and reduction that happen in this reaction. oxidation: reduction:

The radioactive isotope used in the Calvin experiments was carbon-12 nitrogen-15 carbon-14 boron-8

Identify the element with atomic number 80: Element name Atomic number 80 Number of electrons Number of protons Element name For each atomic number below, fill in the table for the name of the element, the number of protons, and the number of electrons.

Question 3 2.5 pts Which of the following absorption terms describes a drug molecule that moves from an area of high concentration to an area of low concentration? Active transport Passive Transport Facilitative passive transport Pinocytosis

Flammable solvents should be used —. Select one: with adequate ventilation in glass containers while wearing synthetic clothing to clean benchtops

What is the balanced chemical equation for the combustion of methane?

What is the empirical formula of a compound composed of 3.25% hydrogen (H), 19.36% carbon (C), and 77.39% oxygen (O) by mass?

Calculate the percent composition by mass of each element in KClO3.

Given the equation C2H6(g)+O2(g) → CO2(g)+H2O(g) (not balanced). determine the number of liters of O2 consumed at STP when 76.7 grams of C2H6 is burned. 3.42 L 181 x 10^5 1 57.1 L 224 L

5 square 2 square square g If this measurement is precise enough for the chemist, round it to 6 significant digits. Otherwise, press the "No solution" button.

Name each compound and determine the charge an each ion in the compounds. Spelling counts. Li2O name of Li2O: Li charge O charge: CaS name of CaS: Ca charge: S charge

Answer parts (a)-(e) for the function shown below. f(x)=x^3-2x^2-x+2 The y-intercept is y=2. (Type an integer or a decimal.) d. Determine whether the graph has y-axis symmetry, origin symmetry, or neither. Choose the correct answer below. A. origin symmetry B. y-axis symmetry C. neither e. Use the graphing tool to graph the function. If necessary, find a few additional points and graph the function. Use the maximum number of turning points to check whether it is drawn correctly.

Which of the following is an agent of mechanical digestion in the mouth? a.) Saliva b.) Peristalsis c.) Teeth d.) Salivary amylase

Arrange the following elements in order of increasing (1 = smallest, 4 = largest) atomic radius: Ge, N, P, Si. N Ge P Si

A chemistry student needs 15.0 g of thiophene for an experiment. She has available 120 g of a 26.2% w/w solution of thiophene in ethanol. Calculate the mass of solution the student should use. If there's not enough solution, press the "No solution" button. Round your answer to 3 significant digits. g

Multiple Select Question Select all that apply - disinfection of food preparation equipment - disinfection of drinking water - skin and wound cleansing

What is the sign of ΔS for a system that increases its disorder?

What are the products of the reaction: HC2H3O2 + NaOH -----> HCl + NaOH ------>

Residuos Peligrosos Tabla de identificación de los residuos peligrosos generados Número interno Residuo Actividad Sector Cantidad Ton/año Clasificación SEGUNDS148 LISTASI,II,II,Art 88,89y 90 (Lista A) Clasificación Art 90 Características dePeligrosidad TC, TA, LIX, INF, CO,RE ------------------------ Respell Aguas delavado conaceitesy refrigerantes Aseo industrial pisofábricay lavadoras Fábrica 180 Tóxico crónico Arrastra la clasificación según el Decreto Supremo 148 y la clasificación según el artículo 90 donde correspondan. 19 A4070 II, 17 A4060 1,18 A4090

Answer the quiz question. Lower your LabPad and take a look at the PC screen again to explore the graph. A regression formula is obtained from the standard curve. This formula describes the relationship between concentration and absorbance data. We can use this regression formula to calculate the concentration of unknown samples. In this case, which regression type best describes our absorbance data? a) Linear b) Exponential c) Power d) log -log

Which of the following species are IR inactive? Select all that apply. N ≡ N H2O CO2 CCl4 O=0

The base peak in the mass spectrum of an amine is often due to This cleavage yields a(n) ion. dehydration; resonance-stabilized a-cleavage; resonance-stabilized a-cleavage; radical dehydration; radical

All of the following are correct about the indirect ELISA, except Multiple Choice it can detect antibodies in a serum sample. it is the common screening test for antibodies to Helicobacter. color development indicates that antibody was not present in the patient's serum. it is the common screening test for antibodies to Hepatitis A. a known antigen is adsorbed to the surface of a well.

The organic portion of the heme group in hemoglobin is known as Protoporphyrin Proline Protozoa Porin

In the laboratory, a general chemistry student measured the pH of a 0.334 M aqueous solution of aniline, C6H5NH2 to be 9.034. Use the information she obtained to determine the Kb for this base. Kb(experiment) =

Which of the following statements about equilibrium of chemical reactions is correct?

The amount of energy needed to boost an electron to a higher orbital determines the of light that a pigment will absorb.

How many electrons must each of the atoms below lose to achieve a noble gas electron configuration? Li electrons Sr Al electrons Ba What is a polyatomic ion?

When a man observed a sobriety checkpoint conducted by a police department, he saw 656 drivers were screened and 9 were arrested for driving while intoxicated. Based on those results, we can estimate that P(W)=0.01372, where W denotes the event of screening a driver and getting someone who is intoxicated. What does P(W̅) denote, and what is its value? What does P(W̅) represent? A. P(W̅) denotes the probability of driver being intoxicated. B. P(W̅) denotes the probability of a driver passing through the sobriety checkpoint. C. P(W̅) denotes the probability of screening a driver and finding that he or she is not intoxicated. D. P(W̅) denotes the probability of screening a driver and finding that he or she is intoxicated. P(W̅)= (Round to five decimal places as needed.)

Which best explains the role of plant pigments in photosynthesis? Multiple Choice convert heat to electricity provide electrons absorb light energy produce photon energy reduce NADP

Use the References to access important values if needed for this question. Write a net ionic equation to show why solid potassium hydroxide, KOH(s), forms a basic solution when it dissolves in water.

What is the predicted hybridization of the carbon atom indicated in the cycloalkene shown? A sp B sp^2 C sp^3 D sp^3d E sp^3d^2

Question 8 2 pts What is the electron configuration of N ? If there are no electrons in an orbital enter O (do not leave it blank) 1 s 2 s 2 p 3 s 3 p

In the simulation, select the Macro mode. Then choose each of the following solutions from the dropdown list provided in the upper left corner. The beaker will automatically fill up to the 0.50 L mark with the solution, and the pH scale displayed on the left side of the beaker will indicate the pH of the solution at 25°C. Classify the following solutions as acids, bases, or neutral based on their pH values as shown in the simulation. - blood - drain cleaner - hand soap - milk - coffee - soda pop - vomit - battery acid - orange juice - water Acid Base Neutral

This type of farming protects the soil from erosion by plowing perpendicular to the slope, following the contours of the land instead of up and down hills along the slope of the land, which can prevent the formation of gullies.

Classify each of the compounds as soluble or not soluble: - manganese(II) carbonate - aluminum nitrate - ammonium sulfate

Qué residuos sólidos tienden a ser maleables: I. Plásticos II. Orgánicos III. Metálicos IV. Iónicos

Which statement is false for a competitive inhibitor? It is irreversible. α′=1. It is often structurally similar to the substrate. It does not change Vmax.

Chemical Reactions Finding mole ratios from chemical formulae Brookelyn This is the chemical formula for talc (the main ingredient in talcum powder): Mg3(Si2O5)2(OH)2 An analytical chemist has determined by measurements that there are 35 moles of silicon in a sample of talc. How many moles of hydrogen are in the sample? Be sure your answer has the correct number of significant digits. mol × 10

Question 4 2 Points Calculate the volume of 2.09 M Nal that would be needed to precipitate all of the Hg^+2 ion from 272 mL of a 2.02 M Hg(NO3)2. The equation for the reaction is 2 Nal(aq) + Hg^2(NO3)2(aq) -> Hgl2(s) + 2 NaNO3(aq)

No Charge ( 0 ) 3. We can use a chart called the periodic table to find information about all the elements. 4. A molecule is made up of at least different atoms. 5. A field of science that studies atoms and molecules is called 6. How many atoms are in two water molecules (H2O) ? 7. Name an example of an element: 8. Name an example of a molecule: . 9. Which two subatomic particles make up the nucleus of an atom? a. b. 10. Draw a model of an atom on the back of this page and label the 3 different subatomic particles.

This is the chemical formula for nickel tetracarbonyl (a powerfully poisonous liquid used in nickel refining): Ni(CO)4 A chemical engineer has determined by measurements that there are 16. moles of nickel in a sample of nickel tetracarbonyl. How many moles of carbon are in the sample? Be sure your answer has the correct number of significant digits.

For many purposes we can treat ammonia (NH₃) as an ideal gas at temperatures above its boiling point of -33 °C. Suppose the temperature of a sample of ammonia gas is raised from 61.0°C to 94.0°C, and at the same time the pressure is increased by 15.0%. Does the volume of the sample increase, decrease, or stay the same? O increase O decrease If you said the volume increases or decreases, calculate the percentage change in the volume. Round your answer to the nearest percent. O stays the same

At a certain university, 16% of students fail general chemistry on their first attempt. Professor Brown teaches at this university and believes that the rate of first-time failure in his general chemistry classes is 33%. He samples 96 students from last semester who were first-time enrollees in general chemistry and finds that 15 of them failed his course. Using α=0.05, can you conclude that the percentage of failures differs from 33%?

A solution is another name for what combination/process of substances? a formation reaction a homogeneous mixture an alloy a combination reaction a heterogeneous mixture

Problem 2: (14% of Assignment Value) A 2.5 g copper penny is given a charge of -2.1 nC. - Part (a) ✔️ Which statement best describes the numbers of protons and electrons in the penny when it is charged as indicated? Electrons were added, and the number of electrons exceeds the number of protons. ✔️ Correct: - Part (b) ✔️ How many electrons were transferred in order to create the charge on the penny? Ne=1311 x 10^10 Ne=1.311 x 10^10 electrons ✔️ Correct! Part (c) By what percentage do the transferred electrons change the mass of the penny? (Express your result as a positive percentage for an increase, negative for a decrease.) (Δm/m)= %

For the following reaction, 25.2 grams of sulfur dioxide are allowed to react with 5.49 grams of oxygen gas. sulfur dioxide (g)+ oxygen (g) → sulfur trioxide (g) What is the maximum mass of sulfur trioxide that can be formed? Mass = 8 What is the FORMULA for the limiting reactant? What mass of the excess reagent remains after the reaction is complete? Mass = g

Select all that apply The molecular ion produced when an organic molecule is bombarded by a high-energy stream of electrons Select all that apply. shares the molecular mass of the compound is a radical cation is likely to fragment once formed is negatively charged is highly stable

The nitroblue-tetrazolium (NBT) test is the primary test for chronic granulomatous disease. In this test, first NBT is added to cells. NADPH oxidase then takes an electron from NADPH and donates it to NBT. When NBT receives an electron, it forms an insoluble blue compound (formazan). Based on this information, is NBT oxidized or reduced? (NCLEX-HESI-TEAS Style) View Available Hint(s) NBT is reduced. NBT is oxidized.

Gaseous water and solid calcium oxide are produced by the decomposition of solid calcium hydroxide. Write a balanced chemical equation for this reaction.

If uranium-238 has a half-life of 3.69 × 10^9 years, how many millennium (1000 years) will it take for 4 grams of depleted uranium to be depleted by 0.9 grams of its original mass? (Round to the nearest whole number)

Trace metals in drinking water affect the flavor and an unusually high concentration can pose a health hazard. Ten pairs of data were taken measuring zinc concentration in bottom water and surface water of a water source. Location Zinc concentration in bottom water Zinc concentration in surface water --------- 1 .430 .415 2 .266 .238 3 .567 .390 4 .531 .410 5 .707 .605 6 .716 .609 7 .651 .632 8 .589 .523 9 .469 .411 10 .723 .612 Do the data support that the zinc concentration is less on the surface than the bottom of the water source, at the alpha=0.1 level of significance? Note: A normal probability plot of difference in zinc concentration between the bottom and surface of water indicates the population could be normal and a boxplot indicated no outliers. a. Express the null and alternative hypotheses in symbolic form for this claim. Assume mud=mu1-mu2, where mu1 is the population mean zinc concentration in the bottom of water and mu2 is the mean zinc concentration in the surface of water. H0: mud Select an answer 0 Ha: mud Select an answer 0 b. What is the significance level? alpha= c. What is the test statistic? Round to 3 decimal places. 20= d. What is the p-value? Round to 4 decimal places. p= e. Make a decision. O Do not reject the null Reject the null f. What is the conclusion? There is sufficient evidence to support the claim that the zinc concentration is less on the surface than the bottom of the water source. There is not sufficient evidence to support the claim that the zinc concentration is less on the surface than the bottom of the water source.

A process that releases heat is called a(n) process. Select the correct answer below: endothermic exothermic energetic electric

Question 12 Lead(IV) chromate has the following formula:

True or False: Specific heat is the amount of energy required to raise the temperature of 1 g of a substance by 1°C.

You are given a container filled with clumps of iron and sand. You can separate the iron from the sand using a magnet. Therefore this is a a. homogeneous mixture b. compound c. heterogeneous mixture d. solution

Elemental phosphorus occurs as tetratomic molecules, P4. What mass of chlorine gas is needed to react completely with 495. g of phosphorus to form phosphorus pentachloride? Be sure your answer has the correct number of significant figures. P4 + 10Cl2 -> 4PCl5

Solving for a gaseous reactant 3 / 5 Kassi The great French chemist Antoine Lavoisier discovered the Law of Conservation of Mass in part by doing a famous experiment in 1775. In this experiment Lavoisier found that mercury(II) oxide, when heated, decomposed into liquid mercury and an invisible and previously unknown substance: oxygen gas. 1. Write a balanced chemical equation, including physical state symbols, for the decomposition of solid mercury(II) oxide ( HgO ) into liquid mercury and gaseous dioxygen. 2. Suppose 23.0 mL of dioxygen gas are produced by this reaction, at a temperature of 130.0°C and pressure of exactly 1 atm. Calculate the mass of mercury(II) oxide that must have reacted. Round your answer to 3 significant digits. g

SO₃ tetrahedral

This is the chemical formula for talc (the main ingredient in talcum powder): Mg3(Si2O5)2(OH)2 An analytical chemist has determined by measurements that there are 0.0251 moles of silicon in a sample of talc. How many moles of hydrogen are in the sample? Be sure your answer has the correct number of significant digits. mol

What kind of intermolecular forces act between two bromine (Br2) molecules? Note: If there is more than one type of intermolecular force that acts, be sure to list them all, with a comma between the name of each force.

The following chemical reaction takes place in aqueous solution: FeBr2(aq) + Na2S(aq) → FeS(s) + 2 NaBr(aq) Write the net ionic equation for this reaction.

The data collected is Eye Color. Would you consider the data collected Quantitative or Qualitative?

Orientation, apprentice programs, and job simulation are all activities included in a performance appraisal the recruitment process training and development the selection process

If 952 g C6H12O6 reacts according to the following equation, how many liters of C2H5OH can be produced, assuming 100% yield? Density of C2H5OH is 0.789 g / mL C6H12O6 is 180.2 g / mol. C6H12O6(s) → 2 C2H5OH(l) + 2 CO2(g) Hint: you must convert C2H5OH to LC2H5OH as last step. Hint: 1000 mL=1 L 7.32 L 551 L 0.0925 L 0.217 L 93.0L 0.617 L 4.04 L 1.59 L

An unknown element contains 56 protons, 54 electrons, and has a mass number 135. What is the charge on this ion? -2 -1 +2 +1

Consider the following data for cobalt: atomic mass: 58.933 g/mol electronegativity: 1.88 electron affinity: 63.7 kJ/mol ionization energy: 760.4 kJ/mol heat of fusion: 16.2 kJ/mol Does the following reaction absorb or release energy? (1) Co(g) → Co+(g) + e− Is it possible to calculate the amount of energy absorbed or released by reaction (1) using only the data above? If you answered yes to the previous question, enter the amount of energy absorbed or released by reaction (1): kJ / mol Does the following reaction absorb or release energy? (2) Co(g) + e− → Co−(g) Is it possible to calculate the amount of energy absorbed or released by reaction (2) using only the data above? If you answered yes to the previous question, enter the amount of energy absorbed or released by reaction (2): kJ / mol

d. 135 g of iodine

The major source of chloride in the American diet is cooked meat. eggs. yogurt. table salt.

If you want to make a 0.5 M solution of MgSO4, how many grams of MgSO4 would you need? Assume the volume of the solution is one liter.

Uno de los residuos proveniente de la construcción es el yeso. Este residuo es considerado un sólido: (A) Iónico y cristalino (B) Orgánico (C) Metálico (D) Maleable y dúctil

6.29: Rank the following species in order of (a) Ge, Ge+, Ge^- (b) Ne, O^2-, Na^+, F^2, N^3-, Mg^2+

Which statement is true concerning the 2 -step reaction below? (C) a The overall reaction is Substitution. b The overall reaction is Addition. c The overall reaction is Elimination. d The overall reaction is a rearrangement.

element mass % carbon 17.9 % hydrogen 2.26 % chlorine 79.7 % Write the empirical chemical formula of X.

A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains 7.80 kg of water at 27.4 °C. During the reaction 57.5 kJ of heat flows out of the flask and into the bath. Calculate the new temperature of the water bath. You can assume the specific heat capacity of water under these conditions is 4.18 J ⋅ g^-1 ⋅ K^-1. Round your answer to 3 significant digits.

Which one of the following is an exothermic process? - boiling soup - water evaporating - condensation of water vapor - ice melting - Ammonium thiocyanate and barium hydroxide are mixed at 25°C: the temperature drops

Using VSEPR theory, predict the electron group geometry, molecular shape, and the bond angles in a molecule that contains 5 electron groups (2 bonds and 3 lone pair electrons). trigonal bipyramidal, trigonal bipyramidal, 90° and 120° trigonal bipyramidal, trigonal bipyramidal, 180° trigonal bipyramidal, linear, 180°

Only one of the following processes will occur measurably at room temperature. Which one? a. : F-C:C: b. : N ≡ C: frown CH3 -> -1: c. : N ≡ N: bumpy CH3 II: d. : O=0: - 1 CH2 = CH2

Which method would be LEAST effective at sterilizing a glass hockey stick to use in the spread-plate method? A. Gamma radiation B. Ultrahigh-temperature pasteurization C. Soaking in Ethanol D. Autoclaving

In the absence of oxygen, some organisms produce ethanol (alcohol) and ATP from pyruvate and NADH. What is the name of this anaerobic pathway? A. Electron Transport System B. Glycolysis C. Fermentation D. Krebs Cycle

REPORT SHEET FOR CALORIMETRY: ENTHALPIES OF REACTIONS A. Enthalpy of Solution Record data for your trials in the table below. Assume the calorimeter is perfect and that it has a calorimeter constant of zero.

This Scientist proposed a model of the Periodic Table where Elements are arranged by Atomic Mass. Moseley Mendeleev Newlands Dobereiner

9 2 points What word describes solutions with a high concentration of hydroxide ions? Buffers Acids Bases Electrolytes

What are the oxidation numbers of each element? a. Cs2O b. Al3O3 c. TO2 d. PtCl2 e. SnF2 f. SbF6-

Which statement is true about crystal lattice energy? It increases as the size of the ions increases. It increases as the charge on the ions decreases. It is the energy that ions absorb when they form a crystal. It is a measure of the strength of the bonds between ions.

Solve the following multi-step mole conversion problem: 0.192 kilograms of SO2 is equal to how many liters of SO2 at STP? *Record your answer to three significant digits and include leading zeros ( 0.5 , not .5 )

Question 10 3 pts Name the given molecule: Name:

Carbon is stored in the atmosphere as- A. O 2 B. NH 3 C. CO 2 D. C 6 H 12 O 6

Solve the rational inequality and graph the solution set on a real number line. Express the solution set in interval notation. (2x+5)/(5x-2) ≤ 1 Move all terms to the left side of the inequality and then define the left side of the inequality as f(x). Then list the intervals determined by the real zeros of f and the real numbers for which f is undefined. Complete the following table. (Type your answers in interval notation. Use ascending order. Type an integer or a simplified fraction.)

Question 8 A reaction vessel contained 0.100 M N2 and O2 initially, determine the equilibrium concentration for nitrogen monoxide in the equilibrium below. N2 + O2 ↔ 2 NO Kp=0.100 0.100 0.0272 none of the above 0.0136 0.0316

Which gases contribute to the greenhouse effect? nitrogen and helium carbon dioxide and methane carbon dioxide and helium nitrogen and methane

The following data was collected at room temperature for the reaction: 2 A(aq) + B(aq) → 3 C(aq) Trial [A](M) [B](M) Initial Rate (M / s) 1 0.1 0.1 2 2 0.3 0.3 6 3 0.1 0.3 2 4 0.2 0.4 4 What is the overall order of the reaction? a. 0th b. 1st c. 2nd d. 3rd e. Can't tell from this information alone

- An electrostatic potential map of boron trifluoride is shown - Is BF3 likely to be a nucleophile or an electrophile? Why? - Draw a Lewis structure for BF3 - Nucleophile or electrophile or both? Where? - Water - Amine - Bromide ion

Which of the compounds H2C2O4, Ca(OH)2, KOH, and HI, behave as bases when they are dissolved in water? A) Ca(OH)2 and KOH B) H2C2O4 and HI C) only HI D) only KOH

Write the pressure equilibrium constant expression for this reaction. 2 H2(g)+O2(g) → 2 H2O(l)

Buffer capacity is a measure of a buffer solution's resistance to changes in pH as strong acid or base is added. Suppose that you have 135 mL of a buffer that is 0.100 M in both acetic acid (CH3COOH) and its conjugate base (CH3COO^-). Calculate the maximum volume of 0.500 M HCl that can be added to the buffer before its buffering capacity is lost.

Mass, and Volume are both good examples of intensive properties (a property that does not depend on the quantity of matter)

Vraag 13: Op watter alkyne in Figuur 13 kan jy Markovnikov se reël toepas?

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