Chemistry Homework Questions & Answers Archive

1.35 mol / 3.55 L

The cell uses a hydrolysis reaction to convert sucrose (table sugar) into its component parts, glucose and fructose: sucrose → fructose + glucose. These simple sugars are then used as substrates in subsequent chemical reactions. In this example, sucrose is an example of a and glucose and fructose are examples of product; products product; reactants reactant; products reactant; reactants IDON'T KNOWYET

reaction highlighted atom is being... ------------ oxidized reduced neither oxidized nor reduced CH₄(g)+H₂O(g) → CO(g)+3H₂(g) 0 0 H₂S(aq)+2NaOH(aq) → Na₂S(aq)+2H₂O(l) FeO(s)+CO(g) → Fe(s)+CO₂(g) 0 N₂(g)+3H₂(g) → 2NH₃(g)

Fill in the blanks below with the correct units. (a) A metal fork weighs about 4 (Choose one) . (b) Deshaun's finger is about 2 (Choose one) long. (c) Today, Latoya drank a total of 6 (Choose one) of water.

Choose the general expression for the solution content of the following generic reaction: aA + bB → cC + dD

Question 5 Which of the following are organic molecules that help enzymes work correctly? Holoenzymes Coenzymes Cofactors Apoenzymes

Select the molecular solid(s). Check all that apply. LiF Sodium NH3 Diamond (C) None of the above

Experiment 10 Reaction Orders (ML 10) Concentration Trial 1 Trial 2 Trial 3 ------------ Concentration of iodide solution (mM) 100.0 100.0 100.0 Concentration of thiosulfate solution (mM) 31.5 31.5 31.5 Concentration of hydrogen peroxide solution (mM) 176.5 176.5 176.5 Temperature of iodide solution (°C) 25.0 Volume of iodide solution (I-)used (mL) 10.0 Volume of thiosulfate solution (S2O32-) used (mL) 1.0 Volume of DI water used (mL) 2.5 Volume of hydrogen peroxide solution (H2O2) used (mL) 7.5 Time (s) 17.6 Observations solution turned blue Initial concentration of iodide in reaction (mM) Initial concentration of thiosulfate in reaction (mM) Concentration of hydrogen peroxide in reaction (mM) Initial Rate (mM/s) - Temperature Concentration of iodide solution (mM) Trial 1 Trial 2 Trial 3 ------------ Concentration of thiosulfate solution (mM) 100.0 100.0 100.0 Concentration of hydrogen peroxide solution (mM) 20.1 20.1 20.1 Temperature of iodide solution (°C) 176.0 176.0 176.0 PHASE 2: Observe reaction rate with 1) Complete the following steps. Place all used glassware in Wash/Waste bin. plate. Turn on stir plate Use 10-mL graduated pipet to transfer 7.5 mL of hydrogen peroxide solution (H2O2) to Trial 1 beaker. Stop timer when solution's color changes. Record exact volume and time in Lab Data Record your observations in Lab Data Calculate initial concentration of each reactant. Record in Lab Data Calculate initial rate of the reaction. Record in Lab Data Pour Trial 1 mixture into "Chemicals for Disposal" beaker and place used beaker into Wash/Waste bin GO TO PHASE 3

Use the following information to answer the next question Some Equations C(s) + 2 H2(g) → CH4(g) ΔH = -74.8 kJ C(s) + 2 Cl2(g) → CCl4(l) ΔH = -106.4 kJ 1/2 H2(g) + 1/2 Cl2(g) → HCl(g) ΔH = -92.3 kJ The enthalpy change for the reaction CH4(g) + 4 Cl2(g) → CCl4(l) + 4 HCl(g) is -216.2 kJ -123.9 kJ -400.8 kJ -273.5 kJ

32 Which elements would you expect to gain electrons in chemical changes? (a) nitrogen (b) iodine (c) tungsten (d) strontium (e) gold

Why does salt dissolve in water?

4) Name this symbol

Select X axis variable Select Y axis variable Select graph type Create graph Display slope Save graph Determine molar absorptivity, ε. Record in Lab Data

A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar System. Mass-spectroscopic analysis produced the following data on the isotopes of tin in these samples: isotope mass (amu) relative abundance --------- ^124 mathrmSn 123.91 92.0% ^115 mathrmSn 114.90 8.0% Use these measurements to complete the entry for tin in the Periodic Table that would be used on 98765 ALEKS. Round your entry for the atomic mass to 3 significant digits. Caution: your correct answer will have the same format but not necessarily the same numbers as the entry for tin in the Periodic Table we use here on Earth.

What is a heterogeneous mixture?

F C=C N C=O H F

An aluminum atom has a mass of 4.48 x 10^-23 g and a small airplane has a mass of 5000 kg. Use this information to answer the questions below. Be sure your answers have the correct number of significant digits. What is the mass of 1 mole of aluminum atoms? Round your answer to 3 significant digits. How many moles of aluminum atoms have a mass equal to the mass of a small airplane? Round your answer to 3 significant digits.

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 Mg^2+ P^3- Mg^2+ S^2- Mg^2+ N^3- Mg^2+ O^2-

What amount of heat is required to raise the temperature of 85 g of water by 7°C? The specific heat of water is 4.184 J/g°C.

Determine a stepwise mechanism for the following reaction that illustrates why two substitution products are formed. Explain why 1-bromohex-2-ene reacts rapidly with a weak nucleophile (CH3OH) under SN1 reaction conditions, even though it is a 1° alkyl halide.

1. Define the following term: chemical energy. A) The capacity to do work. B) The energy associated with the random motion of atoms and molecules. C) The energy stored within the structural units of chemical substances. D) The energy, which comes from the sun.

Samek was driving to work when he suddenly felt paralyzed and couldn't resist falling asleep. Samek may have - damage to his K-complex - REM sleep behavior disorder (RBD) - narcolepsy - somnambulism

Which species in the table below is the strongest reducing agent? Half-reaction Sn(aq)^(4+) + 2 e^- -> Sn(aq)^(2+) V^(3+)(aq) + e^- -> V(aq)^(2+) Zn(aq)^(2+) + 2 e^- -> Zn(s) I2(s) + 2 e^- -> 2 I(aq)

Identify the two compounds below that have the same parent:

Write the identity of the missing nucleus for the following nuclear decay reaction: ? -> Be (8 protons, 4 neutrons) + e (1 proton, 0 neutrons) Express your answer as an isotope.

Ketones contain a(n) group within the carbon chain. (A) carbonyl (B) hydroxyl (C) carboxyl (D) aromatic

Which statement best compares and contrasts two physical properties of matter? Density and solubility are similar because they both involve water, but they are different because density involves dissolving a material and solubility involves floating or sinking a material. Density and solubility are similar because they both involve a material's mass and volume, but they are different because density involves floating materials and solubility involves sinking materials. Boiling points and melting points are similar because they both involve changing the heat of a material, but they are different because boiling point involves adding heat to a material and melting point involves removing heat from a material. Boiling points and melting points are similar because they both involve the change in a state of a material, but they are different because boiling point involves a change from a liquid to a gas and melting point involves a change from a solid to a liquid.

If the hydrogen ion concentration of a solution is 10^-8 molar, the solution has a pH of (A) 10.8 (B) 8 (C) 10^-8 (D) -8

Which of the following molecules has a valid Lewis structure that cannot be drawn without violating the octet rule? SbF3 NF3 IF3 PF3

Identifying Physical Properties of Matter Match each physical property of matter to the appropriate definition. buoyant force - the upward force on an object in a fluid conductivity - the ability of a substance to transfer heat or electricity density - the amount of mass in a given volume solubility - the ability of a substance to dissolve in another boiling point - the temperature at which a liquid becomes a gas

In the spectrophotometry lab experiment, you constructed a calibration curve to determine the concentration of an unknown dye using the Beer-Lambert law. A=εℓc Based on the experiment, select the CORRECT statement below: The calibration curve was used to determine the molar absorptivity, ε, which was the slope of the line. The calibration curve was used to obtain the x-axis which is the concentration of the unknown dye. The calibration curve was used to obtain the y-axis, which is the concentration of the unknown dye. The Beer-Lambert law can be used directly without generating a calibration curve for determining the concentration of an unknown dye.

Frequent face washing removes the antimicrobial secretions of: sweat glands. holocrine glands. sebaceous glands. ceruminous glands.

Here is the ground-state electron configuration of a neutral atom of an unknown Element E. Use this diagram to answer the questions below. What is Element E ? Write its chemical symbol. How many unpaired electron spins are there in this atom?

Question 14 (1 point) When the concentrations of reactant molecules are increased, the rate of reaction increases. The best explanation for this phenomenon is that as the reactant concentration increases, the average kinetic energy of molecules increases. the frequency of molecular collisions increases. the rate constant increases. the activation energy increases. the order of reaction increases. Question 15 (1 point) 18 The following mechanism has been suggested for the reaction: H2O2 + 2 H+ + 2 I- → I2 + 2 H2O H2O2 + I- → HOI + OH- OH- + H+ → H2O HOI + H+ + I- → I2 + H2O Slow Fast Fast Identify all intermediates included in this mechanism. H+ and I- H+ and HOI HOI and OH- H+ only H2O and OH-

For each reaction, write the chemical formulae of the oxidized reactants in the space provided. Write the chemical formulae of the reduced reactants in the space provided. - 2 Fe(s) + 3 Pb(NO3)2(aq) → 3 Pb(s) + 2 Fe(NO3)3(aq) - reactants oxidized: - reactants reduced: - Ca(s) + ZnCl2(aq) → Zn(s) + CaCl2(aq) - reactants oxidized: - reactants reduced: - Fel2(aq) + Mg(s) → Mgl2(aq) + Fe(s) - reactants oxidized: - reactants reduced:

A client with a gastrostomy tube (GT) receives a prescription for a 250 ml bolus feeding of Glucerna 60% enteral formula. The nurse should dilute the full-strength formula with how many ml of water? (Enter numeric value only).

Classify the following reaction as a precipitation, an acid-base reaction, or a gas-forming reaction. MgCO3(s) + 2 HCl(aq) → MgCl2(aq) + H2O(l) + CO2(g) gas-forming reaction precipitation acid-base reaction

In this reaction: Mg(s) + I2(s) -> MgI2(s) If 3.26 moles of Mg react with 3.56 moles of I2, and 1.76 moles of MgI2 form, what is the percent yield?

How many valence electrons are in a neutral atom of fluorine?

Write the full and abbreviated electron configurations for bromine. How many core and valance electrons does it have?

Safety precautions must be taken by all laboratory employees while working with chemicals that are potentially harmful.

Identify the inner electrons, outer electrons, and valence electrons in each electron configurations. nitrogen: 1s^2 2s^2 2p^3 inner electrons: outer electrons: valence electrons:

Which of the following atoms contains only three valence electrons: Ar, S, Mg, Al, or Cl ? (Enter your answers as a comma-separated list.)

In the molecule below, identify and circle a bond made up of overlapping sp^2-sp^3 atomic orbitals (AO) and identify and square a different bond made up of sp^3 - sp AO overlap. Explain your answer for both the sp^3-sp and s^2-s^3 bonds.

General Chemistry 4th Edition McQuarrie · Rock · Gallogly University Science presented by Macmillan A pictorial representation of an electronic configuration is shown. uparrow downarrow/1 s uparrow downarrow/2 s uparrow downarrow/uparrow downarrow/2 p uparrow downarrow uparrow downarrow/3 s uparrow uparrow/3 p- Give the full electron configuration. Do not use the noble gas abbreviation. electron configuration: Name the element, assuming that the configuration describes a neutral atom. element name:

The boiling point of chloroform, CHCl3, is 61.70°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in chloroform is testosterone. A student dissolves 11.39 grams of testosterone, C19H28O2 (288.4 g/mol), in 297.3 grams of chloroform. Use the table of boiling and freezing point constants to answer the questions below. Solvent Formula Kb (°C/m) Kf (°C/m) ------------ Water H2O 0.512 1.86 Ethanol CH3CH2OH 1.22 1.99 Chloroform CHCl3 3.67 Benzene C6H6 2.53 5.12 Diethyl ether CH3CH2OCH2CH3 2.02 The molality of the solution is m. The boiling point of the solution is °C.

aluminum hydrogen sulfate: rubidium sulfite: manganese hydrogen phosphate:

Use the References to access important values if needed for this question. The vapor pressure of diethyl ether (ether) is 463.57 mm Hg at 25°C. How many grams of cholesterol, C27H46O, a nonvolatile, nonelectrolyte (MW = 386.6 g/mol), must be added to 257.0 grams of diethyl ether to reduce the vapor pressure to 454.07 mm Hg? diethyl ether = CH3CH2OCH2CH3 = 74.12 g/mol. Mass = g

Below are a few body regions and their locations. Match each region to its location. hypogastric below the cartilage of the epigastric above the stomach inguinal at waist level on either side lumbar the middle section right below hypochondriac on either side of the epigastric

Balance the following reaction: C9H20O2 + O2 → CO2 + H2O

Problem 14.7 The relative rates of the reaction A+B → products in vessels (1)-(4) are 1: 1: 4: 4. Red spheres represent A molecules, and blue spheres represent B molecules. (Figure 1 ) Part A What is the order of the reaction in A? zeroth-order first-order second-order third-order Submit Request Answer Part B

Q35 In chemical notation, the symbol Ca^2+ means a calcium ion that has lost two electrons. a calcium ion that has gained two protons. a calcium ion that has gained two electrons. a calcium ion that has lost two protons. two calcium atoms.

Uniting reactants Aqueous hydrobromic acid (HBr) will react with solid sodium hydroxide (NaOH) to produce aqueous sodium bromide (NaBr) and liquid water (H2O). Suppose 42.9 g of hydrobromic acid is mixed with 28 g of sodium hydroxide. Calculate the maximum mass of sodium bromide that could be produced by the chemical reaction. Be sure your answer has the correct number of significant digits.

Liquid octane (CH3(CH2)6CH3) will react with gaseous oxygen (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O). Suppose 33. g of octane is mixed with 168. g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Be sure your answer has the correct number of significant digits.

Write the chemical formula for this molecule:

Wine goes bad soon after opening because the ethanol (CH3CH2OH) in it reacts with oxygen gas (O2) from the air to form water (H2O) and acetic acid (CH3COOH), the main ingredient of vinegar. What mass of ethanol is consumed by the reaction of 2.4 g of oxygen gas? Be sure your answer has the correct number of significant digits.

Which statement is TRUE about the chemical reaction for photosynthesis in which carbon dioxide and water react to form glucose and oxygen? (1 point) Light energy destroys some of the matter during the reaction. Glucose and oxygen have a higher total mass than carbon dioxide and water. The number of carbon atoms in the reactants and products are equal. The process of photosynthesis is a physical change.

A sample of 5.00 g of methane (CH4) is mixed with 14.5 g of chlorine (Cl2). a. Determine which is the limiting reactant according to the following equation: CH4(g) + 4 Cl2(g) → CCl4(l) + 4 HCl(g) b. The limiting reactant is . - What is the maximum mass of CCl4 that can be formed? Maximum mass = g

The atomic mass number is a whole number and indicates a specific isotope of an element. True False

Draw the Lewis electron dot structure for BeH2. What is the VSEPR shape of the particle? linear tetrahedral bent trigonal

Multiple Select Question Select all that apply Choose all of the following that are regulated when arterial sense organs monitor blood chemistry and blood pressure. Body temperature Heart rate Respiration rate Blood sugar level

Question 20 1 pts Which of the following is NOT an element of the marketing mix? product place purchase price promotion

A reaction is performed to study the reaction of ICl with hydrogen: 2 ICl + H2 -> I2 + 2 HCl The following reaction rate data was obtained in four separate experiments. Experiment [ICl]0, M [H2]0, M Initial Rate, M s^-1 1 0.257 3.20 x 10^-2 4.87 x 10^-4 2 0.514 3.20 x 10^-2 9.74 x 10^-4 3 0.257 6.40 x 10^-2 1.95 x 10^-3 4 0.514 6.40 x 10^-2 3.89 x 10^-3 What is the rate law for the reaction and what is the numerical value of k ? Complete the rate law in the box below. Remember that an exponent of ' 1 ' is not shown and concentrations taken to the zero power do not appear. (Use k for the rate constant.) Rate = k= M^-2 s^-1

Use the following information to answer the next question Sour gas is a mixture of predominantly methane gas and hydrogen sulfide gas. The Claus process can be used to remove hydrogen sulfide gas from sour gas as represented by the following equation. 8 H2 S(g)+4 O2(g) -> S8(s)+8 H2O(g) ΔH°=-1769.6 kJ 5. The enthalpy change for 1.00 mol of H2 S(g) during the Claus process, expressed in scientific notation, is ± a . b c × 10^d kJ / mol. The values of a, b, c and d are (Record your four-digit answer in the numerical-response section below.) Your answer:

What is the mass of (4.50 times 10^22) formula units of (mathrmCoSO4) ? (CoSO4, (154.99 mathrm~g / mathrmmol) ) [?] mathrmg mathrmCoSO4]

Complete the table below. For example, in the first row decide whether Sc^3+ is a cation or anion. In the second row, write the symbol for the ion that an atom of potassium is mostly likely to form and then decide what type of ion it is.

Any change in enzyme shape from its natural form that alters its function or renders the enzyme non-functional is called

The reaction of ethane (C2H6) with bromine gas (Br2) could yield which of the following products? None of the above C2H5Br C2H3Br3 HBr All of the above

Select all sublevels that are present in energy level 1. Select all sublevels that are present in energy level 2. Select all sublevels that are present in energy level 3. Select all sublevels that are present in energy level 4.

Draw the rearrangement product.

Chapter 3 Graded Homework Question 16 of 20 ( 5 points) Question Attempt: 1 of Unlimited Give the correct name for the following compounds. Part 1 of 4 Cs2CO3 Part 2 of 4 Ca(CN)2

Isotope Notation Atom, Cation, or Anion? No. of Protons No. of Neutrons e- gained, lost, or remain the same --------------- ^80 mathrmSe I ^80 mathrmSe^-2

In the laboratory you dissolve 23.9 g of cobalt(II) bromide in a volumetric flask and add water to a total volume of 500 mL. What is the molarity of the solution? M. What is the concentration of the cobalt(II) cation? M. What is the concentration of the bromide anion? M.

Isotlurane is used as an inhaled anesthetic. The image shows the Lewis dot structure of isoflurane. What is the bond angle around each carbon center? 120° 90° 109.5° 180° What is the bond angle around the oxygen center? 109.5° 180° 90° 120° What is the molecular geometry at each carbon center? bent trigonal pyramidal linear tetrahedral trigonal planar

Several tin salts are brightly colored. Give the name for each of the following ionic tin Part 1 of 4 SnBr2 (pale yellow solid): Part 2 of 4 SnCl2 (white solid): Part 3 of 4 SnBr4 (colorless solid):

Select all that apply Secondary alkyl halides may react by SN1 or SN2 reaction mechanisms. Which of the following will favor an SN1 mechanism over an SN2 mechanism? (Select all that apply.) - use of polar protic solvents - use of methanol as both the nucleophile and solvent - use of acetone as the solvent - use of a strong nucleophile

Dinitrogen pentoxide Dinitrogen trisulfide Silicon tetrachloride Oxygen difluoride Phosphorus tribromide Iodine heptafluoride

Question 28 How many H atoms are in the molecule C6H3(C3H7)2(C2H5)? (A) 10 (B) 15 (C) 22 (D) 27 Question 29 A bond where the electrons are shared equally is called a(n): (A) polar covalent (B) coordinate covalent (C) nonpolar covalent. (D) ionic

Atoms/Compounds/Elements What are Atoms? Matter is anything that has mass and takes up space (volume). All matter is made up of atoms. Atoms make up elements, which make up molecules and compounds. Atoms are the smallest, most basic unit of matter and atoms join together to make elements. Atoms are composed of three major particles: protons, neutrons, and electrons. Protons have a positive charge, neutrons have no charge (are neutral), and electrons have a negative charge. In the image, protons are blue, neutrons are red, and electrons are silver. What are the three major parts of an atom? - protons, neutrons, electrons

Identify the sentence below that describes this reaction: 2 Ba(NO3)2(s) -> 2 BaO(s) + 2 N2(g) + 2 O2(g) a. The decomposition of solid barium nitrate leads to the formation of solid barium oxide, diatomic nitrogen gas, and diatomic oxygen gas. b. The decomposition of solid barium nitrate leads to the formation of solid barium oxide, nitrogen gas atom, and an oxygen gas atom. c. The decomposition of solid barium nitrogen oxygen leads to the formation of solid barium oxygen, diatomic nitrogen gas, and diatomic oxygen gas. d. The decomposition of solid barium (II) nitrate leads to the formation of solid barium (II) oxide, diatomic nitrogen gas, and diatomic oxygen gas. e. The decomposition of solid barium nitrite leads to the formation of solid barium oxide, diatomic nitrogen gas, and diatomic oxygen gas.

Select all that apply Which of the following statements correctly describe the procedure used to calculate ΔH° for a reaction using bond enthalpies? Select all that apply. ΔH° is obtained by adding together the absolute values of the bond energies for all bonds broken and formed. ΔHbonds formed is always endothermic. The sum ΔHbonds broken is given a positive value. ΔH for the reaction is given by ΣBE(reactants) - ΣBE(products)

Some covalently bonded species do not obey the octet rule because they have an odd number of electrons. A species containing one electron is called a radical. Many radicals are highly reactive and tend to form a(n) bond with an unpaired electron on another molecule.

Which of the following would not be counted in the calculation of GDP? Select all that apply buying a brand new car washing your clothes purchasing a puppy from a farmer with a reputation for not paying taxes government spending on social security paying for a flight to Las Vegas paying for a chef to cook your meals

Predict the products of the following reaction. If no reaction will occur, use the NO REACTION button. Be sure your chemical equation is balanced! (CH2OH)2CHOH(l) + O2(g) →

Which of the following require proof in a logical system? Check all that apply. A. Corollaries B. Postulates C. Theorems D. Axioms

an alkaline earth metal.

How many molecules of ammonia are present in 3.0 g of ammonia (Formula = NH3)? 1.1 x 10^23 1.8 x 10^1 3.6 x 10^23 1.2 x 10^24 2.9 x 10^-25

Which of the following is defined by age, gender, marital status, number of children, education level, or occupation?

What is the IUPAC name of the molecule shown?

Entropy and Free Energy Calculating standard reaction free energy from standard free energies of ... Using the thermodynamic information in the ALEKS Data tab, calculate the standard reaction free energy of the following chemical reaction: 4 H2O2(l) + PbS(s) → PbSO4(s) + 4 H2O(l) Round your answer to zero decimal places.

Refer to the following incomplete precipitation reaction: Ni2(SO3)3(aq) + (NH4)3PO4(aq) → a. For the reaction above, provide the balanced molecular equation. Be sure to include states of matter and show all work.

Classify the relationship between each pair of molecules as constitutional isomers, diastereomers, enantiomers, identical molecules, or not isomers. Select the single best answer for each part.

constitutional isomers diastereomers enantiomers identical molecules not isomers

What is an integrated rate law?

Identify the subshell for electron addition in carbon to form a -1 anion.

Solve the equation by factoring. 3y^2 + 16y + 5 = 0 y= (smaller value) y= (larger value)

Provide the formula for each of the chemical names of the following ionic compounds: 1. Iron(III) sulfate 2. Copper(II) chloride 3. Potassium dichromate 4. Silver oxide 5. Magnesium phosphate

An atom with an electrical charge is a(n) Select one: a. isotope b. molecule c. ion d. compound

A 1.5 m^3 tank holds a two-phase liquid-vapor mixture of water at the saturation temperature, 100°C. The quality of the mixture is 50%. 1. Determine the specific volume of mixture in the tank, in m^3 / kg.

Numeric Entry Work - Aktiv C app.aktiv.com Question 6 of 20 How many different types of orbitals are present in the g-subshell?

Questão 08 Nas condições ambientais, é exemplo de sistema em estado de equilibrio uma A) Xícara de café bem quente. B) Garrafa de água mineral gasosa fechada. C) Chama uniforme de bico de Bunsen. D) Porção de água fervendo em temperatura constante.

Across a period, which group will have the largest atomic radius? - halogens - alkali metals - alkaline earth metals - chalcogens

Write the empirical formula for at least four ionic compounds that could be formed from the following ions: SO4^2-, IO3^-, NH4^+, Fe^3+

Question The exponents in a rate law can be found: Select the correct answer below: from the stoichiometric coefficients of the reaction from the molar masses of the compounds by experiment only none of the above FEEDBACK MORE INSTRUCTION Content attribution

What is the relationship between the two structures shown? same compound enantiomers diastereomers none of these

A rate expression for any product of a chemical reaction will always be: Select the correct answer below: positive negative zero depends on the reaction

Gesucht sei die Freie Standardbildungsenthalpie ΔGBildung^0 von festem Phenol (C6H5OH(s)). Setzen Sie voraus, dass Ihnen die Zahlenwerte der Standardverbrennungsenthalpie ΔHVerbrennung^0(C6H5OH(s)), der Standardbildungsenthalpien ΔHBildung^0(CO2(g)) und ΔHBildung^0(H2O(g)), sowie der molaren Standardentropien Sm^0(C6H5OH(s)), Sm^0(C(s)), Sm^0(H2(g)) und Sm^0(O2(g)) aus der Literatur bekannt sind.

If a sample of a certain solution is determined to have a [H3O+] concentration of 6.69 × 10^-13 moles/liter, what is its pH? Round off your answer to one decimal place.

A chemist needs 30 mL of a 12% acid solution for an experiment. The lab has available a 10% and a 25% solution. How many milliliters of the 10% and how many milliliters of the 25% solutions should the chemist mix to make the 12% solution?

Stories about the dangers of dihydrogen monoxide circulate occasionally online, and peoplecall for it to be banned. What is the formula for this compound?

Which of the following molecules are constitutional isomers?

The symbol of an unprefixed scientific unit has been left off of each measurement in the table below. Fill in the missing unit symbols. Note: by "scientific" unit we mean the SI unit, or unit approved for use with the SI, that is most often used by chemists for each measurement. - the volume of water in a tall glass = 0.5 - the length of a high-school swimming pool = 25. - the mass of a US penny = 2.5 - the world record for the 100 m freestyle swim = 44.9

Calculate the number of moles of magnesium oxide, MgO in 68.05 g of the compound.

Carry out each calculation and give the answers using the proper number of significant figures. Part 1 of 2 20.50 × 4.6= Part 2 of 2 0.707 / 18324=

Determining the strength of acids from a sketch

An ionic compound has the general form, XCl , Which option for X and y correctly completes the formula?

Driving Question: What is the concentration of methyl orange in bottle Unknown A and Unknown B?

What is the percent mass of potassium chloride in a solution made by adding 25 g of potassium chloride to 70.0 ml of water? - Your answer should have two significant figures. Provide your answer below:

Number of electron groups Bond angle Outer atoms/Lone pairs Shape 2 ? 2 / 0 ? 3 ? 3 / 0 trigonal planar (planar triangular) 4 2 / 1 ? 4 / 0 tetrahedral bond angle in a two electron group molecule: square The shape of a two electron group molecule is bond angle in a three electron group molecule: square The shape of a three electron group molecule with two outer atoms and one lone pair is

One common conversion is between the US unit of pound (Ib) and the metric unit kilogram (kg). There are 2.205 lb in 1 kg . Using this conversion factor, how many kg would an 175 lb individual be? 79.4 kg 386 kg 0.0126 kg 175 kg

Label the reactant and product in the following equation. FeCl3 + MgO → Fe2O3 + MgCl2

What is the specific heat (J / g · °C) of a metal object whose temperature increases by 3.0°C when 17.5 g of metal was heated with 38.5 J? Only enter the correct number, not units!

Which of these is an example of a chemical property? Sodium chloride has a cubic crystal structure. Fireworks are explosions of black powder. Gold is a malleable and ductile metal. The melting point of iron is 1538°C.

A galvanic cell is powered by the following redox reaction: Zn^2+(aq) + H2(g) + 2 OH^-(aq) → Zn(s) + 2 H2O(l) Answer the following questions about this cell. If you need any electrochemical data, be sure you get it from the ALEKS Data tab. Write a balanced equation for the half-reaction that takes place at the cathode.

PCl3 Trigonal pyramidal ✓ CH2S Bent CO2 ☐ SeF2 ☐

Use your periodic table to complete the table below. The row has been done for you. Element Atomic # Mass Protons Neutrons Electrons Symbol Copper 29 63.5 29 34 29 Cu Nickel 28 58.7 28 30 28 Ni Hydrogen 1 1.0 1 0 1 H Sulfur 16 32.1 16 16 16 S Oxygen 8 16.0 8 8 8 O Element Atomic # Mass Protons Neutrons Electrons Symbol Nitrogen 7 14.0 7 7 7 N Aluminum 13 27.0 13 14 13 Al Copper 29 63.5 29 34 29 Cu Match each of the positive ions listed with the total number of electrons that ion contains. Use your periodic table. The same answer may be used more than once. A) 2 B) 10 C) 21 D) 23 E) 24 F) 25 G) 36 H) 43 I) 76 J) 81 Al^+3 Cr^+3 Li^+1 Mg^+2 Sn^+2 Fe^+3 Rb^+1 Pt^+2

Gaseous ethane (CH3CH3) reacts with gaseous oxygen gas (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O). If 2.74 g of water is produced from the reaction of 10.2 g of ethane and 18.3 g of oxygen gas, calculate the percent yield of water. Round your answer to 3 significant figures.

La synthèse des phospholipides et du cholestérol est principalement effectuée par : le réticulum endoplasmique les riboson?s le complexe golgien les mitochondries le noyau

Considere la función: f(x, y)= 12x^2y-3y^3/x^2+y^2 para (x, y) ≠ (0,0) 0 para (x, y) = (0,0) a) Calcule ∂f/∂x(0,0), ∂f/∂y(0,0) b) ¿Es f diferenciable en (0,0)? Justifique adecuadamente.

A piece of metal (mass = 21.251 g) is placed in 17.00 mL of chloroform in a 25-mL graduated cylinder. The chloroform level increases to 23.48 mL. The best value for density of this metal from these data is

Write the electron configuration for a neutral atom of xenon.

34. Identify each of the following as a substance or a mixture. a. oxygen b. sodium sulfite c. smog d. a carrot e. pure milk chocolate f. rabbit fur

Identify the general outer electron configuration for each group of elements shown in this periodic table outline.

A 0.2321 g sample of a monoprotic acid neutralizes 57.08 mL of a 0.06453 M KOH solution. Calculate the molar mass of the acid. Be sure your answer has the correct number of significant digits.

Refer to the above figure. Which point(s) represents the lowest level of utility? Point A only Point C only Points A C Point B

Elemental analysis of an unknown mineral tells you that the mineral consists of 29.3% Al, 20.6% F, 15.3% Si, and 34.8% O. What is the empirical formula of this mineral?

The statement, "In a chemical reaction, matter is neither created nor destroyed" is called the Law of Conservation of Mass. Dalton's Atomic Theory. the Scientific Method, the Law of Multiple Proportions. the Law of Definite Proportions.

Salinity is lower at low latitudes (near the equator) due to [Select]

What will be the correct formula of Cadmium phosphate? CdP Cd3(PO4)2 CdPO4 Cd3P2

How many Hydrogens are in the molecule with the line structure shown here:

What is the empirical formula of the compound with the following compositions: 20.2 percent Al, 79.8 percent Cl?

Calculate the combustion energy (Delta E) for benzene, mathrmC6 mathrmH6 in mathrmkJ / mathrmmol. Express your answer in kilojoules per mole to three significant figures. Delta E= mathrmkJ / mathrmmol

7) Phosphoric acid 8) Hydrocyanic acid

35) Sterling silver contains 925 parts silver and 75 parts copper by mass. What is the percent copper in sterling silver in the sample? A) 7.5 % B) 8.1 % C) 12 % D) 93 % E) 100 % 39) Stainless steel is an alloy of iron, chromium, nickel, and manganese metals. For a 5.00 g sample is 18.0 % chromium, what is the mass of chromium in the sample? A) 0.04508 B) 0.0900 g C) 0.450 g D) 0.900 g E) 1.808

How many electrons can the d sublevel hold?

Part 2 of 3 potassium metal metalloid nonmetal Part 3 of 3

During photosynthesis, solar energy is converted to chemical energy by the chloroplasts. The process is represented by carbohydrate - oxygen → Carbon dioxide - water - energy carbohydrate - carbon dioxide → oxygen - water - energy solar energy - oxygen - water → carbohydrate - oxygen solar energy - carbon dioxide - water → carbohydrate - oxygen solar energy → carbohydrate - oxygen

Which solutions have the same molarity? Check all that apply. Solutions E and F Solutions C, D, and E Solutions C, D, and F Solutions A and F None of the above

(NH4)3PO4

Which of the following molecules will have dipole-dipole forces as the strongest intermolecular force? Choose three. CO BF3 NCl3 CO2 HF CH2F2

Which is a recommended step for your organization's procedure for handling a large chemical spill? A Clean up the spill B Do not let employees evacuate C Do not secure the area D Notify the emergency coordinator

Which statement is not part of Dalton's atomic theory? Certain groups of elements have similar properties. Atoms combine in simple whole-number ratios to form compounds. All atoms of a given element have the same mass and other properties. Each element is composed of indestructible particles called atoms.

Question 10 2 pts How many electrons would be expected in the outermost electron shell of an atom with atomic number 13 ? 1 6 3 4 2

ITEM II. Desarrollo ( 12 pts ). 9,0 g de agua líquida a 50°C 1 atm se calientan hasta obtener vapor de agua a 100°C y 0,5 atm a través de los siguientes procesos reversibles consecutivos: Calcule: a) El calor q en cal para el proceso A (2 pts) b) El trabajo (w) en cal para el proceso B (2 pts) c) ΔU en cal para el proceso C ( 2 pts) d) ΔH en cal para el proceso B(2 pt) e) ΔS en cal / K para el proceso C(2 pts) f) ΔG en cal para el proceso B(2 pts) Considere: T(K) = °C + 273; masa molar 18 g / mol ; Cv m = 1,5 R ; R = 1,987 cal mol^-1 K^-1; Cagua(1) = 1 cal g^-1 K^-1 ; ΔHvap = 540 cal g^-1

Write the chemical formula for this molecule:

Identify the most appropriate method to measure the mass of a sample of white powder. Select the single best answer. Place a weighing vessel on the balance and tare the balance. Then add the sample of white powder to the weighing vessel and record the mass. Place the weighing vessel on the balance and add the sample of white powder to the weighing vessel. Tare the balance and then record the mass. Place the sample of white powder on the balance and record the mass. Place a weighing vessel on the balance, add the sample of white powder to the weighing vessel, and then record the mass. Tare the balance. Then place a weighing vessel on the balance. Add the sample of white powder to the weighing vessel. Record the mass.

Question 8 Sodium Fluoride is a colorless or white compound often used as an insecticide and in toothpastes to prevent tooth decay. After sodium (Na) binds to fluoride (F), what charge is it left with? Sodium -10 -1 +11 +1

For each pair of compounds listed, check the box next to the one with the higher boiling point. compounds higher boiling point CI4 0 CBr4 (Circle) GeCl4 GeF4 (Circle) SiH4 (Circle) SiI4 (Circle)

MISSED THIS? Read Section 3.4. You can click on the Review link to access the section in your eText. Part A Classify each of the following compounds as ionic or molecular. Drag the appropriate compounds to their respective bins. Reset Help CF2C CO KMnO4 NI3 Cr2O3 Molecular Ionic Submit Request Answer Provide Feedback

SiO2(s) + C(s) → Si(s) + CO(g)

Complete the table below, classifying each element as an alkali metal, alkaline earth metal, transition metal, halogen, or noble gas. Symbol element name Family Name/Group# Is it metal, nonmetal, or Mg Si No family name, but 4A or IVA Br sodium Ni neon

What is the energy of the reactants?

Next, the chemist measures the volume of the unknown liquid as 0.577 L and the mass of the unknown liquid as 728 g. Calculate the density of the liquid. Be sure your answer has the correct number of significant digits. g . cm^-3 Given the data above, is it possible to identify the liquid? - yes - no - tetrahydrofuran - acetone - dimethyl sulfoxide - glycerol - pentane

Which element in hydrochlorothiazide, C7H8ClN3O4S2, has the greatest mass percentage? A carbon B chlorine C nitrogen D oxygen

Which type of bonding is never found in elements? A covalent B ionic C metallic D van der Waals' forces

You may have observed that rubbing alcohol (isopropyl alcohol) evaporates more easily than water. This indicates that the normal boiling point of water is higher than that of rubbing alcohol. Which of these two substances possesses stronger attractive forces between molecules? Briefly explain your answer.

Construct the expression for Ka for the weak acid, HPO4^2-. HPO4^2- (aq) + H2O(l) ⇌ H3O^+ (aq) + PO4^3- (aq)

Conclusion In your own words, DEFINE atomic mass and describe how to calculate it. How is it different from mass number? Explain how carbon's mass is 12.0108 , yet its mass number is 12.

When heated, lithium reacts with nitrogen to form lithium nitride: 6 Li(s) + N2(g) -> 2 Li3 N(s) Part: 0 / 2 Part 1 of 2 What is the theoretical yield of Li3 N in grams when 12.8 g of Li is heated with 34.9 g of N2? Be sure your answer has the correct number of significant digits. g

Pair of Functional Groups Similar IR Expected for: Differentiating IR Expected for: aldehyde carboxylic acid C=O stretch 1700 cm^-1 Very broad H-O stretch for acid only at 3600-2500 cm^-1 alcohol ether, both with 3 carbons alkane alkyne, both with 3 carbons alkane alcohol, both with 3 carbons ester ketone

9. Modelo en que una empresa transmite a otra una serie de conocimientos, asistencia e imagen comercial a cambio de una tarifa: a) Licencia de uso b) Transmisión de marca c) Franquicia d) Know how

How many moles of propane (C3H8) are present in 20.0 g of propane? (molar mass of C3H8=44.01 g) (A) 4.01 g (B) 18.01 g (C) 36.02 g (D) 54 g (E) 0.454 g

Indicar a qué elemento del patrimonio (activo, pasivo o patrimonio neto) corresponde: Servicio de Gas Valores recibidos de terceros (cheques) Costo de la mercadería vendida Préstamo del Banco de la Nación Argentina a pagar Sueldos a Pagar Saldo a pagar de IVA Materia Prima para producción Venta de mercadería Anticipos de sueldos Capital Social

At label 1 on the curve the predominant form of His is His^2- is - At label 2 on the curve the average net charge of His is -0.5 - At label 3 on the curve His is at its greatest buffering capacity - At label 4 on the curve pH=pKa of the carboxyl group - At label 5 on the curve histidine's carboxyl group is completely titrated with OH^- - At label 6 on the curve the predominant form of His is His^1- is -

Calculate the mass of forsterite (Mg2SiO4) that contains a million (1.000 x 10^6) magnesium atoms. Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits.

83. What is the amount, in moles, of each elemental sample? MISSED THIS? Read Section 2.9; Watch KCV 2.9 a. 11.8 g Ar c. 26.1 g Ta b. 3.55 g Zn d. 0.211 g Li 84. What is the mass, in grams, of each elemental sample? a. 2.3 x 10^-3 mol Sb b. 0.0355 mol Ba c. 43.9 mol Xe d. 1.3 mol W 85. How many silver atoms are there in 3.78 g of silver?

Classify each observation according to the order of reaction it describes. Zero-order reaction A plot of the concentration of the reactant versus time yields a straight line. First-order reaction The half-life of the reaction is independent of the initial concentration. A plot of the natural log of the concentration of the reactant versus time yields a straight line. Answer Bank As the initial concentration of the reactant increases, the half-life of the reaction becomes shorter. The rate constant has units of M · s^-1. The rate constant has units of M^-1 · s^-1.

A sample of a "suboxide" of cesium gives up 1.6907% of its mass as gaseous oxygen when gently heated, leaving pure cesium behind. Determine the empirical formula of this binary compound.

How many grams of gold (Au) are there in 93.37 moles of Au? Be sure your answer has the correct number of significant digits. g Au × 10^1

A compound containing Na, C, and O is found to have 1.06 mol Na, 0.528 mol C, and 1.59 mol O. What is the empirical formula of the compound?

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