Question 1

Select the set of coefficients from the response list that correctly balances the equation. __CH4 F1F1F1S1F1F1F10 __C3H8 + __H2

Accepted Answer

A)  1, 1, 2 
B)  1, 2, 1 
C)  2, 1, 2 
D)  3, 1, 2 
A)  1, 1, 2 
B)  1, 2, 1 
C)  2, 1, 2 
D)  3, 1, 2 D

Question 2

Which of the following is the correct "setup" for the problem "How many grams of H2O will be produced from 2.1 moles of O2 and an excess of H2S?" according to the reaction 2H2S + 3O2   2H2O + 2SO2

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)    C

Question 3

To determine the formula mass of a compound you should:

Accepted Answer

A)  Add up the atomic masses of all the atoms present. 
B)  Add up the atomic masses of all the atoms present and divide by the number of atoms present. 
C)  Add up the atomic numbers of all the atoms present. 
D)  Add up the atomic numbers of all the atoms present and divide by the number of atoms present. 
A)  Add up the atomic masses of all the atoms present. 
B)  Add up the atomic masses of all the atoms present and divide by the number of atoms present. 
C)  Add up the atomic numbers of all the atoms present. 
D)  Add up the atomic numbers of all the atoms present and divide by the number of atoms present. A

Question 4

Which set of coefficients balances the equation C4H10 + O2 F1F1F1S1F1F1F10 CO2 + H2O?

Accepted Answer

A)  1, 6, 4, 5 
B)  1, 7, 4, 5 
C)  1, 3, 4, 5 
D)  2, 13, 8, 10 
A)  1, 6, 4, 5 
B)  1, 7, 4, 5 
C)  1, 3, 4, 5 
D)  2, 13, 8, 10

Question 5

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: (1) In balancing an equation, formula subscripts are adjusted as needed to obtain the balance.
(2) 1.00 mole of C contains the same number of atoms as does 12.0 g of C.
(3) Both a microscopic and macroscopic levels of interpretation exist for a chemical formula with the former involving atoms and the latter involving molecules.

Accepted Answer

A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true. 
A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true.

Question 6

In which of the following unbalanced equations are five moles of reactants required to produce two moles of products?

Accepted Answer

A)  Na + N2 F1F1F1S1F1F1F10 NaN3 
B)  Al + S F1F1F1S1F1F1F10 Al2S3 
C)  N2 + H2 F1F1F1S1F1F1F10 NH3 
D)  more than one correct response 
E)  no correct response 
A)  Na + N2 F1F1F1S1F1F1F10 NaN3 
B)  Al + S F1F1F1S1F1F1F10 Al2S3 
C)  N2 + H2 F1F1F1S1F1F1F10 NH3 
D)  more than one correct response 
E)  no correct response

Question 7

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: (1) Avogadro's number is part of the conversion factor needed to solve a "moles of A to grams of A" problem.
(2) The sum of the coefficients in the balanced equation for the production of water from hydrogen gas and oxygen gas is five.
(3) 2.00 moles of NH3 molecules have a mass of 34.0 grams.

Accepted Answer

A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true. 
A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true.

Question 8

One mole of H2SO4 contains

Accepted Answer

A)  two moles H atoms 
B)  four moles S atoms 
C)  seven moles of atoms 
D)  more than one correct response 
E)  no correct response 
A)  two moles H atoms 
B)  four moles S atoms 
C)  seven moles of atoms 
D)  more than one correct response 
E)  no correct response

Question 9

Which of following statements concerning theoretical yield, actual yield, and percent yield is correct?

Accepted Answer

A)  Theoretical yield is a calculated number. 
B)  Actual yield is a calculated number. 
C)  A percent yield of greater than 50% is very difficult to obtain. 
D)  Percent yield is calculated by dividing the theoretical yield by the actual yield. 
A)  Theoretical yield is a calculated number. 
B)  Actual yield is a calculated number. 
C)  A percent yield of greater than 50% is very difficult to obtain. 
D)  Percent yield is calculated by dividing the theoretical yield by the actual yield.

Question 10

Select the correct numerical value for the number of moles of atoms in two moles of SO2.

Accepted Answer

A)  1 
B)  2 
C)  6 
D)  12 
A)  1 
B)  2 
C)  6 
D)  12

Question 11

A compound with the formula TeCln has a formula mass of 269.41 amu. What is the value for n in the formula TeCln?

Accepted Answer

A)  2 
B)  3 
C)  4 
D)  6 
A)  2 
B)  3 
C)  4 
D)  6

Question 12

A mole of a chemical substance represents

Accepted Answer

A)  the formula mass of that substance expressed in atomic mass units 
B)  Avogadro's number of grams of that substance 
C)  the mass of that substance that will combine with 1.00 gram of carbon 
D)  more than one correct response 
E)  no correct response 
A)  the formula mass of that substance expressed in atomic mass units 
B)  Avogadro's number of grams of that substance 
C)  the mass of that substance that will combine with 1.00 gram of carbon 
D)  more than one correct response 
E)  no correct response

Question 13

Which of the following quantities must be known before the percent yield of a product Q can be calculated?

Accepted Answer

A)  theoretical yield of Q 
B)  actual yield of Q 
C)  number of other products produced besides Q 
D)  more than one correct response 
E)  no correct response 
A)  theoretical yield of Q 
B)  actual yield of Q 
C)  number of other products produced besides Q 
D)  more than one correct response 
E)  no correct response

Question 14

Select the set of coefficients from the response list that correctly balances the equation. __CO + O2 F1F1F1S1F1F1F10 CO2

Accepted Answer

A)  1, 1, 2 
B)  1, 2, 1 
C)  2, 1, 2 
D)  3, 1, 2 
A)  1, 1, 2 
B)  1, 2, 1 
C)  2, 1, 2 
D)  3, 1, 2

Question 15

Which of the following statements concerning Avogadro's number is correct?

Accepted Answer

A)  It has the value 6.02 F1F1F1S1F1F1F10 10-23. 
B)  It denotes the number of molecules in one mole of any molecular substance. 
C)  It is the mass, in grams, of one mole of any substance. 
D)  It denotes the number of atoms in one mole of any substance. 
A)  It has the value 6.02 F1F1F1S1F1F1F10 10-23. 
B)  It denotes the number of molecules in one mole of any molecular substance. 
C)  It is the mass, in grams, of one mole of any substance. 
D)  It denotes the number of atoms in one mole of any substance.

Question 16

Using the balanced equation for the combustion of ethane: 2C2H6 + 7 O2 F1F1F1S1F1F1F10 4CO2 + 6H2O, how many moles of CO2 produced at the same time nine moles of H2O are produced?

Accepted Answer

A)  6 
B)  7 
C)  8 
D)  14 
A)  6 
B)  7 
C)  8 
D)  14

Question 17

Which of the following samples has the largest mass, in grams?

Accepted Answer

A)  5 moles of CO2 
B)  6 moles of CN 
C)  7 moles of H2O 
D)  8 moles of H2 
A)  5 moles of CO2 
B)  6 moles of CN 
C)  7 moles of H2O 
D)  8 moles of H2

Question 18

The "setup" for the problem, "What is the mass, in grams, of 5.69 F1F1F1S1F1F1F10 1019 atoms of Xe?" which follows is correct, except numbers in the middle conversion factor have been replaced by the letters A and B. What are the numerical values of A and B, respectively?

Accepted Answer

A)  1 and 6.02 F1F1F1S1F1F1F10 1023 
B)  1 and 131.29 
C)  6.02 F1F1F1S1F1F1F10 1023 and 1 
D)  131.29 and 6.02 F1F1F1S1F1F1F10 1023 
A)  1 and 6.02 F1F1F1S1F1F1F10 1023 
B)  1 and 131.29 
C)  6.02 F1F1F1S1F1F1F10 1023 and 1 
D)  131.29 and 6.02 F1F1F1S1F1F1F10 1023

Question 19

In which of the following pairings of masses does the first listed mass contain more moles of substance than the second listed mass?

Accepted Answer

A)  18.02 g H2O and 18.02 g NH3 
B)  44.01 g CO2 and 44.01 g CO 
C)  105 g CH4 and 105 g NO2 
D)  more than one correct response 
E)  no correct response 
A)  18.02 g H2O and 18.02 g NH3 
B)  44.01 g CO2 and 44.01 g CO 
C)  105 g CH4 and 105 g NO2 
D)  more than one correct response 
E)  no correct response

Question 20

Select the set of coefficients from the response list that correctly balances the equation. __N2 + O2 F1F1F1S1F1F1F10 NO

Accepted Answer

A)  1, 1, 2 
B)  1, 2, 1 
C)  2, 1, 2 
D)  3, 1, 2 
A)  1, 1, 2 
B)  1, 2, 1 
C)  2, 1, 2 
D)  3, 1, 2

Exam 6: Chemical Calculations: Formula Masses, Moles, and Chemical Equations

Select the set of coefficients from the response list that correctly balances the equation. __CH4  __C3H8 + __H2

Which of the following is the correct "setup" for the problem "How many grams of H2O will be produced from 2.1 moles of O2 and an excess of H2S?" according to the reaction 2H2S + 3O2 2H2O + 2SO2

To determine the formula mass of a compound you should:

Which set of coefficients balances the equation C4H10 + O2  CO2 + H2O?

In which of the following unbalanced equations are five moles of reactants required to produce two moles of products?

One mole of H2SO4 contains

Which of following statements concerning theoretical yield, actual yield, and percent yield is correct?

Select the correct numerical value for the number of moles of atoms in two moles of SO2.

A compound with the formula TeCln has a formula mass of 269.41 amu. What is the value for n in the formula TeCln?

A mole of a chemical substance represents

Which of the following quantities must be known before the percent yield of a product Q can be calculated?

Select the set of coefficients from the response list that correctly balances the equation. __CO + O2  CO2

Which of the following statements concerning Avogadro's number is correct?

Using the balanced equation for the combustion of ethane: 2C2H6 + 7 O2  4CO2 + 6H2O, how many moles of CO2 produced at the same time nine moles of H2O are produced?

Which of the following samples has the largest mass, in grams?

The "setup" for the problem, "What is the mass, in grams, of 5.69  1019 atoms of Xe?" which follows is correct, except numbers in the middle conversion factor have been replaced by the letters A and B. What are the numerical values of A and B, respectively?

In which of the following pairings of masses does the first listed mass contain more moles of substance than the second listed mass?

Select the set of coefficients from the response list that correctly balances the equation. __N2 + O2  NO

Basic Concepts About Matter

Measurements in Chemistry

Atomic Structure and the Periodic Table

Chemical Bonding: the Ionic Bond Model

Chemical Bonding: the Covalent Bond Model

Gases, Liquids, and Solids

Solutions

Chemical Reactions

Acids, Bases, and Salts

Nuclear Chemistry

Saturated Hydrocarbons

Unsaturated Hydrocarbons

Alcohols, Phenols, and Ethers

Aldehydes and Ketones

Carboxylic Acids, Esters, and Other Acid Derivatives

Amines and Amides

Carbohydrates

Lipids

Proteins

Enzymes and Vitamins

Nucleic Acids

Biochemical Energy Production

Carbohydrate Metabolism

Lipid Metabolism

Protein Metabolism

Filters

Select the set of coefficients from the response list that correctly balances the equation. CH₄  C₃H₈ + __H₂

Which of the following is the correct "setup" for the problem "How many grams of H₂O will be produced from 2.1 moles of O₂ and an excess of H₂S?" according to the reaction 2H₂S + 3O₂ 2H₂O + 2SO₂

Which set of coefficients balances the equation C₄H₁₀ + O₂  CO₂ + H₂O?

One mole of H₂SO₄ contains

Select the correct numerical value for the number of moles of atoms in two moles of SO₂.

A compound with the formula TeCl_n has a formula mass of 269.41 amu. What is the value for n in the formula TeCl_n?

Select the set of coefficients from the response list that correctly balances the equation. __CO + O₂  CO₂

Using the balanced equation for the combustion of ethane: 2C₂H₆ + 7 O₂  4CO₂ + 6H₂O, how many moles of CO₂ produced at the same time nine moles of H₂O are produced?

The "setup" for the problem, "What is the mass, in grams, of 5.69  10¹⁹ atoms of Xe?" which follows is correct, except numbers in the middle conversion factor have been replaced by the letters A and B. What are the numerical values of A and B, respectively?

Select the set of coefficients from the response list that correctly balances the equation. __N₂ + O₂  NO