Question 1

A compound that gains electrons in a redox reaction while causing another compound to be oxidized is called a(n)_____ agent.

Accepted Answer

The answer of A compound that gains electrons in a...

Question 2

In the balanced redox reaction: 2 Cu(s)+ S(s)$\rightarrow$Cu2S(s), how many electrons are gained or lost by each copper atom?

Accepted Answer

A) each copper atom gains two (2)electrons 
B) each copper atom gains one (1)electron 
C) each copper atom loses one (1)electron 
D) each copper atom loses two (2)electrons 
A) each copper atom gains two (2)electrons 
B) each copper atom gains one (1)electron 
C) each copper atom loses one (1)electron 
D) each copper atom loses two (2)electrons

Question 3

In redox reactions, metals tend to undergo oxidation.

Accepted Answer

A) True 
 B)False

Question 4

When the mass of a substance produced in a reaction must be calculated, first its number of moles is determined using mole ratios, and then Avogadro's number is used to convert moles to grams.

Accepted Answer

A) True 
 B)False

Question 5

Consider the balanced reaction: 4 NO2 + O2 + 2 H2O $\rightarrow$ 4 HNO3. If 100. g of NO2 is placed in a reaction vessel the theoretical yield of nitric acid (HNO3)collected will be 137 g.

Accepted Answer

A) True 
 B)False

Question 6

The conversion factor shown below was obtained from the balanced chemical equation: 4 KO2(s)+ 2 CO2(g)$\rightarrow$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 7

Combustion reactions are redox reactions.

Accepted Answer

A) True 
 B)False

Question 8

The Greek letter delta ($\Delta$)may be written over the reaction arrow in a chemical equation to indicate that

Accepted Answer

A) heat is generated when the reaction occurs. 
B) a catalyst is needed for the reaction to occur. 
C) water is needed for the reaction to occur. 
D) heat is needed for the reaction to occur. 
A) heat is generated when the reaction occurs. 
B) a catalyst is needed for the reaction to occur. 
C) water is needed for the reaction to occur. 
D) heat is needed for the reaction to occur.

Question 9

Consider the oxidation of sodium metal to sodium oxide described by the balanced equation: 4 Na + O2 $\rightarrow$  2 Na2O. If 2.55 mol of sodium reacts, and 75.0 g of Na2O is produced, what is the percent yield?

Accepted Answer

A) 94.9% yield 
B) 34.0% yield 
C) 47.5% yield 
D) 190.% yield 
A) 94.9% yield 
B) 34.0% yield 
C) 47.5% yield 
D) 190.% yield

Question 10

Which chemical equation is properly balanced?

Accepted Answer

A) SO2 + O2 + H2O $\rightarrow$  H2SO4 
B) 2 SO2 + O2 + 2 H2O $\rightarrow$  2 H2SO4 
C) SO2 + O2 + 4 H2O $\rightarrow$  2 H2SO4 
D) 4 SO2 + O2 + 4 H2O $\rightarrow$  4 H2SO4 
A) SO2 + O2 + H2O $\rightarrow$  H2SO4 
B) 2 SO2 + O2 + 2 H2O $\rightarrow$  2 H2SO4 
C) SO2 + O2 + 4 H2O $\rightarrow$  2 H2SO4 
D) 4 SO2 + O2 + 4 H2O $\rightarrow$  4 H2SO4

Question 11

How many carbon atoms are in 77.28 g of ethane (C2H6)?

Accepted Answer

A) 2.570 carbon atoms 
B) 5.140 carbon atoms 
C) 3.094 × 1024 carbon atoms 
D) 1.548 × 1024 carbon atoms 
E) 1.238 × 1025 carbon atoms 
A) 2.570 carbon atoms 
B) 5.140 carbon atoms 
C) 3.094 × 1024 carbon atoms 
D) 1.548 × 1024 carbon atoms 
E) 1.238 × 1025 carbon atoms

Question 12

To determine the overall percent yield in a synthesis that has more than one step, subtract the percent yield for each step from 100% yield.

Accepted Answer

A) True 
 B)False

Question 13

How many moles of sodium chloride (table salt, NaCl, molar mass 58.44 g/mol)are contained in a 1.00 lb box of table salt?

Accepted Answer

A) 26, 500 mol of NaCl 
B) 4.68 × 1024 mol of NaCl 
C) 58.44 mol NaCl 
D) 7.77 mol of NaCl 
E) 0.129 mol of NaCl 
A) 26, 500 mol of NaCl 
B) 4.68 × 1024 mol of NaCl 
C) 58.44 mol NaCl 
D) 7.77 mol of NaCl 
E) 0.129 mol of NaCl

Question 14

How many moles of sulfur trioxide are formed from 3 moles of oxygen using the given balanced equation? 2 SO2 + O2 $\rightarrow$  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 15

Beaker A contains 1 mole of iron atoms, and Beaker B contains 1 mole of lead atoms. Which statement concerning these two samples is known with certainty?

Accepted Answer

A) Beakers A and B contain samples with the same molar mass. 
B) Beakers A and B contain an equal number of atoms. 
C) Beakers A and B contain an equal volume of atoms. 
D) Beakers A and B contain equal masses of atoms. 
A) Beakers A and B contain samples with the same molar mass. 
B) Beakers A and B contain an equal number of atoms. 
C) Beakers A and B contain an equal volume of atoms. 
D) Beakers A and B contain equal masses of atoms.

Question 16

Write a balanced chemical equation for the reaction of acetone (C3H6O)with oxygen (O2)to form carbon dioxide (CO2)and water (H2O).

Accepted Answer

A) C3H6O + O2 $\rightarrow$  CO2 + H2O 
B) C3H6O + 4 O2 $\rightarrow$  3 CO2 + 3 H2O 
C) 3 CO2 + 3 H2O $\rightarrow$ C3H6O + 4 O2 
D) 6 C3H6O + 8 O2 $\rightarrow$  6 CO2 + 6 H2O 
A) C3H6O + O2 $\rightarrow$  CO2 + H2O 
B) C3H6O + 4 O2 $\rightarrow$  3 CO2 + 3 H2O 
C) 3 CO2 + 3 H2O $\rightarrow$ C3H6O + 4 O2 
D) 6 C3H6O + 8 O2 $\rightarrow$  6 CO2 + 6 H2O

Question 17

A chemical equation is an expression that uses chemical formulas and other symbols to illustrate what _____ constitute the starting materials in a reaction and what _____ are formed.

Accepted Answer

The answer of A chemical equation is an expression that...

Question 18

In the chemical equation 2 Co(NO3)3 + 3 (NH4)2S $\rightarrow$  Co2S3 + 6 NH4NO3 , how many nitrogen atoms are on each side of the equation?

Accepted Answer

A) 2 
B) 3 
C) 6 
D) 12 
E) 16 
A) 2 
B) 3 
C) 6 
D) 12 
E) 16

Question 19

A 200.-mg ibuprofen (C13H18O2)tablet contains greater than one mole of ibuprofen molecules.

Accepted Answer

A) True 
 B)False

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 5: Chemical Reactions

A compound that gains electrons in a redox reaction while causing another compound to be oxidized is called a(n)_____ agent.

In the balanced redox reaction: 2 Cu(s)+ S(s) →\rightarrow→ Cu2S(s), how many electrons are gained or lost by each copper atom?

In redox reactions, metals tend to undergo oxidation.

When the mass of a substance produced in a reaction must be calculated, first its number of moles is determined using mole ratios, and then Avogadro's number is used to convert moles to grams.

Consider the balanced reaction: 4 NO2 + O2 + 2 H2O →\rightarrow→ 4 HNO3. If 100. g of NO2 is placed in a reaction vessel the theoretical yield of nitric acid (HNO3)collected will be 137 g.

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

Combustion reactions are redox reactions.

The Greek letter delta ( Δ\DeltaΔ )may be written over the reaction arrow in a chemical equation to indicate that

Consider the oxidation of sodium metal to sodium oxide described by the balanced equation: 4 Na + O2 →\rightarrow→ 2 Na2O. If 2.55 mol of sodium reacts, and 75.0 g of Na2O is produced, what is the percent yield?

Which chemical equation is properly balanced?

How many carbon atoms are in 77.28 g of ethane (C2H6)?

To determine the overall percent yield in a synthesis that has more than one step, subtract the percent yield for each step from 100% yield.

How many moles of sodium chloride (table salt, NaCl, molar mass 58.44 g/mol)are contained in a 1.00 lb box of table salt?

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

Beaker A contains 1 mole of iron atoms, and Beaker B contains 1 mole of lead atoms. Which statement concerning these two samples is known with certainty?

Write a balanced chemical equation for the reaction of acetone (C3H6O)with oxygen (O2)to form carbon dioxide (CO2)and water (H2O).

A chemical equation is an expression that uses chemical formulas and other symbols to illustrate what _____ constitute the starting materials in a reaction and what _____ are formed.

In the chemical equation 2 Co(NO3)3 + 3 (NH4)2S →\rightarrow→ Co2S3 + 6 NH4NO3 , how many nitrogen atoms are on each side of the equation?

A 200.-mg ibuprofen (C13H18O2)tablet contains greater than one mole of ibuprofen molecules.

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

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

Digestion and the Conversion of Food Into Energy

Carbohydrate, Lipid, and Protein Metabolism

Filters

In the balanced redox reaction: 2 Cu(s)+ S(s) $\rightarrow$ Cu₂S(s), how many electrons are gained or lost by each copper atom?

Consider the balanced reaction: 4 NO₂ + O₂ + 2 H₂O $\rightarrow$ 4 HNO₃. If 100. g of NO₂ is placed in a reaction vessel the theoretical yield of nitric acid (HNO₃)collected will be 137 g.

The Greek letter delta ( $\Delta$ )may be written over the reaction arrow in a chemical equation to indicate that

Consider the oxidation of sodium metal to sodium oxide described by the balanced equation: 4 Na + O₂ $\rightarrow$ 2 Na₂O. If 2.55 mol of sodium reacts, and 75.0 g of Na₂O is produced, what is the percent yield?

How many carbon atoms are in 77.28 g of ethane (C₂H₆)?

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

Write a balanced chemical equation for the reaction of acetone (C₃H₆O)with oxygen (O₂)to form carbon dioxide (CO₂)and water (H₂O).

A chemical equation is an expression that uses chemical formulas and other symbols to illustrate what _ constitute the starting materials in a reaction and what _ are formed.

In the chemical equation 2 Co(NO₃)₃ + 3 (NH₄)₂S $\rightarrow$ Co₂S₃ + 6 NH₄NO₃, how many nitrogen atoms are on each side of the equation?

A 200.-mg ibuprofen (C₁₃H₁₈O₂)tablet contains greater than one mole of ibuprofen molecules.

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