Question 1

A 100-g sample of the compound below contains less than 6.02 × 1023 molecules.

Accepted Answer

A) True 
 B)False

Question 2

The molar mass of dibromomethane (CH2Br2)is larger than the molar mass of dichloromethane (CH2Cl2).

Accepted Answer

A) True 
 B)False

Question 3

The balanced reaction: 4 Fe(s)+ 3 O2(g)→ 2 Fe2O3(s)is an oxidation-reduction reaction.

Accepted Answer

A) True 
 B)False

Question 4

Identify the correct classification for the reaction 2 PbSO4 → 2 PbSO3 + O2

Accepted Answer

A) Combination 
B) Decomposition 
C) Single Replacement 
D) Double Replacement 
E) None of the choices are correct. 
A) Combination 
B) Decomposition 
C) Single Replacement 
D) Double Replacement 
E) None of the choices are correct.

Question 5

A student runs the reaction: LiOH + CO2 → LiHCO3. The reaction consumes 45.0 g LiOH and produces 72.8 g of LiHCO3. Which of the statements concerning this reaction is true?

Accepted Answer

A) The actual yield of the product is 72.8 g LiHCO3. 
B) The theoretical yield of the product is 72.8 g LiHCO3. 
C) The theoretical yield of the product is 117.8 g LiHCO3. 
D) The percent yield of the reaction is 61.8%. 
A) The actual yield of the product is 72.8 g LiHCO3. 
B) The theoretical yield of the product is 72.8 g LiHCO3. 
C) The theoretical yield of the product is 117.8 g LiHCO3. 
D) The percent yield of the reaction is 61.8%.

Question 6

How many iron atoms are in 0.32 mol of Fe2O3?

Accepted Answer

A) 3.9 × 1023 iron atoms 
B) 3.9 iron atoms 
C) 6.02 × 1023 iron atoms 
D) 1.9 × 1023 iron atoms 
E) 1.1 × 10-24 iron atoms 
A) 3.9 × 1023 iron atoms 
B) 3.9 iron atoms 
C) 6.02 × 1023 iron atoms 
D) 1.9 × 1023 iron atoms 
E) 1.1 × 10-24 iron atoms

Question 7

The molar mass of CaCO3 is greater than the molar mass of Ca(NO3)2.

Accepted Answer

A) True 
 B)False

Question 8

Complete the following table using the given balanced equation and the initial quantities of reactants. Equation: S8 + 12 O2 → 8 SO3

Accepted Answer

A) 16 molecules formed 
B) 8 molecules formed 
C) 32 molecules formed 
D) 1 molecule formed 
A) 16 molecules formed 
B) 8 molecules formed 
C) 32 molecules formed 
D) 1 molecule formed

Question 9

Combustion reactions are redox reactions.

Accepted Answer

A) True 
 B)False

Question 10

Consider the oxidation of sodium metal to sodium oxide described by the balanced equation: 4 Na + O2 → 2 Na2O. What is the theoretical yield of Na2O in grams from 9.0 mol of O2?

Accepted Answer

A) 11 g of Na2O 
B) 410 g of Na2O 
C) 1,100 g of Na2O 
D) 280 g of Na2O 
E) 560 g of Na2O 
A) 11 g of Na2O 
B) 410 g of Na2O 
C) 1,100 g of Na2O 
D) 280 g of Na2O 
E) 560 g of Na2O

Question 11

How many moles of sulfur trioxide are formed from 3 moles of oxygen using the given balanced equation? 2 SO2 + O2 → 2 SO3

Accepted Answer

A) 1 mol of SO3 
B) 2 mol of SO3 
C) 3 mol of SO3 
D) 5 mol of SO3 
E) 6 mol of SO3 
A) 1 mol of SO3 
B) 2 mol of SO3 
C) 3 mol of SO3 
D) 5 mol of SO3 
E) 6 mol of SO3

Question 12

The reaction: Mg(s)+ 2 HBr(aq)→ MgBr2(s)+ H2(g)is an oxidation-reduction reaction.

Accepted Answer

A) True 
 B)False

Question 13

A balanced chemical equation tells the number of ________ of each reactant that combine and the number of ________ of each product formed.

Accepted Answer

A) grams; grams 
B) grams; moles 
C) moles; grams 
D) moles; moles 
A) grams; grams 
B) grams; moles 
C) moles; grams 
D) moles; moles

Question 14

The conversion factor shown below was obtained from the balanced chemical equation: 4 KO2(s)+ 2 CO2(g)→ 2 K2CO3(s)+ 3 O2(g). This conversion factor would be used to calculate which of the following?

Accepted Answer

A) The amount of KO2 required to react with a certain amount of O2 
B) The amount of O2 that can react with a certain amount of KO2 
C) The amount of O2 that can be produced from a certain amount of KO2 
D) The amount of KO2 that is required to produce a certain amount of O2 
A) The amount of KO2 required to react with a certain amount of O2 
B) The amount of O2 that can react with a certain amount of KO2 
C) The amount of O2 that can be produced from a certain amount of KO2 
D) The amount of KO2 that is required to produce a certain amount of O2

Question 15

How many moles of chloroethylene (C2H3Cl)contain 5.47 × 1026 molecules?

Accepted Answer

A) 3.29 × 1050 mol of C2H3Cl 
B) 5.47 × 1026 mol of C2H3Cl 
C) 909 mol of C2H3Cl 
D) 5450 mol of C2H3Cl 
A) 3.29 × 1050 mol of C2H3Cl 
B) 5.47 × 1026 mol of C2H3Cl 
C) 909 mol of C2H3Cl 
D) 5450 mol of C2H3Cl

Question 16

In a redox reaction,the ________ agent is the substance that gets oxidized.

Accepted Answer

The answer of In a redox reaction,the ________ agent is...

Question 17

A 100-g sample of the compound below contains greater than one mole of molecules.

Accepted Answer

A) True 
 B)False

Question 18

What is the molar mass of the compound show below?

Accepted Answer

A) 90.13 amu 
B) 90.13 g/mol 
C) 93.13 amu 
D) 93.13 g/mol 
E) 91.14 g/mol 
A) 90.13 amu 
B) 90.13 g/mol 
C) 93.13 amu 
D) 93.13 g/mol 
E) 91.14 g/mol

Question 19

What is the mass of 3.81 mol of PH3?

Accepted Answer

A) 34.0 g 
B) 3.81 g 
C) 8.92 g 
D) 130. g 
E) 0.112 g 
A) 34.0 g 
B) 3.81 g 
C) 8.92 g 
D) 130. g 
E) 0.112 g

Question 20

If a synthesis has four steps and each step has a 75% yield (0.75 written as a decimal),what is the overall percent yield?

Accepted Answer

A) 75% 
B) 19% 
C) 56% 
D) 32% 
E) 42% 
A) 75% 
B) 19% 
C) 56% 
D) 32% 
E) 42%

Exam 5: Chemical Reactions

A 100-g sample of the compound below contains less than 6.02 × 1023 molecules.

The molar mass of dibromomethane (CH2Br2)is larger than the molar mass of dichloromethane (CH2Cl2).

The balanced reaction: 4 Fe(s)+ 3 O2(g)→ 2 Fe2O3(s)is an oxidation-reduction reaction.

Identify the correct classification for the reaction 2 PbSO4 → 2 PbSO3 + O2

A student runs the reaction: LiOH + CO2 → LiHCO3. The reaction consumes 45.0 g LiOH and produces 72.8 g of LiHCO3. Which of the statements concerning this reaction is true?

How many iron atoms are in 0.32 mol of Fe2O3?

The molar mass of CaCO3 is greater than the molar mass of Ca(NO3)2.

Complete the following table using the given balanced equation and the initial quantities of reactants. Equation: S8 + 12 O2 → 8 SO3

Combustion reactions are redox reactions.

Consider the oxidation of sodium metal to sodium oxide described by the balanced equation: 4 Na + O2 → 2 Na2O. What is the theoretical yield of Na2O in grams from 9.0 mol of O2?

How many moles of sulfur trioxide are formed from 3 moles of oxygen using the given balanced equation? 2 SO2 + O2 → 2 SO3

The reaction: Mg(s)+ 2 HBr(aq)→ MgBr2(s)+ H2(g)is an oxidation-reduction reaction.

A balanced chemical equation tells the number of ________ of each reactant that combine and the number of ________ of each product formed.

The conversion factor shown below was obtained from the balanced chemical equation: 4 KO2(s)+ 2 CO2(g)→ 2 K2CO3(s)+ 3 O2(g). This conversion factor would be used to calculate which of the following?

How many moles of chloroethylene (C2H3Cl)contain 5.47 × 1026 molecules?

In a redox reaction,the ________ agent is the substance that gets oxidized.

A 100-g sample of the compound below contains greater than one mole of molecules.

What is the molar mass of the compound show below?

What is the mass of 3.81 mol of PH3?

If a synthesis has four steps and each step has a 75% yield (0.75 written as a decimal),what is the overall percent yield?

Matter and Measurement

Atoms and the Periodic Table

Ionic Compounds

Covalent Compounds

Energy Changes,reaction Rates,and Equilibrium

Gases,liquids,and Solids

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Molecules and Functional Groups

Alkanes

Unsaturated Hydrocarbons

Organic Compounds That Contain Oxygen,halogen,or Sulfur

The Three-Dimensional Shape of Molecules

Aldehydes and Ketones

Carboxylic Acids,esters,and Amides

Amines and Neurotransmitters

Lipids

Carbohydrates

Amino Acids,proteins,and Enzymes

Nucleic Acids and Protein Synthesis

Metabolism and Energy Production

Carbohydrate,lipid,and Protein Metabolism

Filters

A 100-g sample of the compound below contains less than 6.02 × 10²³ molecules.

The molar mass of dibromomethane (CH₂Br₂)is larger than the molar mass of dichloromethane (CH₂Cl₂).

The balanced reaction: 4 Fe(s)+ 3 O₂(g)→ 2 Fe₂O₃(s)is an oxidation-reduction reaction.

Identify the correct classification for the reaction 2 PbSO₄ → 2 PbSO₃ + O₂

A student runs the reaction: LiOH + CO₂ → LiHCO₃. The reaction consumes 45.0 g LiOH and produces 72.8 g of LiHCO₃. Which of the statements concerning this reaction is true?

How many iron atoms are in 0.32 mol of Fe₂O₃?

The molar mass of CaCO₃ is greater than the molar mass of Ca(NO₃)₂.

Complete the following table using the given balanced equation and the initial quantities of reactants. Equation: S₈ + 12 O₂ → 8 SO₃

Consider the oxidation of sodium metal to sodium oxide described by the balanced equation: 4 Na + O₂ → 2 Na₂O. What is the theoretical yield of Na₂O in grams from 9.0 mol of O₂?

How many moles of sulfur trioxide are formed from 3 moles of oxygen using the given balanced equation? 2 SO₂ + O₂ → 2 SO₃

The reaction: Mg(s)+ 2 HBr(aq)→ MgBr₂(s)+ H₂(g)is an oxidation-reduction reaction.

A balanced chemical equation tells the number of of each reactant that combine and the number of of each product formed.

The conversion factor shown below was obtained from the balanced chemical equation: 4 KO₂(s)+ 2 CO₂(g)→ 2 K₂CO₃(s)+ 3 O₂(g). This conversion factor would be used to calculate which of the following?

How many moles of chloroethylene (C₂H₃Cl)contain 5.47 × 10²⁶ molecules?

What is the mass of 3.81 mol of PH₃?