Question 1

Identify the species that is oxidized and the species that is reduced in the reaction: 2 I- + Cl2 → 2 Cl- + I2.

Accepted Answer

A) I- is oxidized and Cl2 is reduced. 
B) Cl2 is oxidized and I- is reduced. 
C) I2 is oxidized and Cl- is reduced. 
D) Cl2 is oxidized and Cl- is reduced. 
E) I2 is oxidized and I- is reduced. 
A) I- is oxidized and Cl2 is reduced. 
B) Cl2 is oxidized and I- is reduced. 
C) I2 is oxidized and Cl- is reduced. 
D) Cl2 is oxidized and Cl- is reduced. 
E) I2 is oxidized and I- is reduced.

Question 2

How many moles of carbon dioxide are in 211 g of carbon dioxide?

Accepted Answer

A) 929 mol of CO2 
B) 4.79 mol of CO2 
C) 167 mol of CO2 
D) 0.209 mol of CO2 
A) 929 mol of CO2 
B) 4.79 mol of CO2 
C) 167 mol of CO2 
D) 0.209 mol of CO2

Question 3

To multiply two numbers in scientific notation,multiply the coefficients together and multiply the exponents in the powers of 10.

Accepted Answer

A) True 
 B)False

Question 4

The electric current generated in batteries used for portable electronic devices and pacemakers results from redox reactions.

Accepted Answer

A) True 
 B)False

Question 5

Consider the unbalanced chemical equation: NH3 + O2 → NO + H2O. It requires 55.4 g of NH3 to completely react with 156 g of O2.

Accepted Answer

A) True 
 B)False

Question 6

The balanced reaction: 4 NO2 + O2 + 2 H2O → 4 HNO3 states that four moles of nitrogen dioxide react with each mole of oxygen.

Accepted Answer

A) True 
 B)False

Question 7

One mole of oxygen molecules contains more atoms than one mole of lead atoms.

Accepted Answer

A) True 
 B)False

Question 8

The mass of one ethanol (C2H6O)molecule is 7.65 × 10-23 grams.

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

The combustion of hexane (C6H14),a component of gasoline,is represented by the balanced chemical equation: 2 C6H14(l)+ 19 O2(g)→ 12 CO2(g)+ 14 H2O(g). If 1.0 mole of hexane undergoes combustion,________ moles of O2 are required.

Accepted Answer

Question 11

A mole is a quantity that contains 6.02 × 10-23 atoms,molecules,or ions.

Accepted Answer

A) True 
 B)False

Question 12

How many grams of oxygen gas are required to completely react with 77.28 g of ethane (C2H6)in the balanced redox reaction: 2 C2H6(g)+ 7 O2(g)→ 4 CO2(g)+ 6 H2O(g)?

Accepted Answer

A) 77.28 g of O2(g) 
B) 23.50 g of O2(g) 
C) 143.9 g of O2(g) 
D) 8.995 g of O2(g) 
E) 287.8 g of O2(g) 
A) 77.28 g of O2(g) 
B) 23.50 g of O2(g) 
C) 143.9 g of O2(g) 
D) 8.995 g of O2(g) 
E) 287.8 g of O2(g)

Question 13

Sodium fluoride can be produced from the reaction between sodium metal and fluorine gas. Which of the following represents the balanced chemical equation for this reaction?

Accepted Answer

A) 2 Na(s)+ F2(g)→ 2 NaF(s) 
B) Na+(s)+ F-(g)→ NaF(s) 
C) Na(s)+ F2(g)→ NaF2(s) 
D) 2 Na(s)+ F2(g)→ Na2F2(s) 
A) 2 Na(s)+ F2(g)→ 2 NaF(s) 
B) Na+(s)+ F-(g)→ NaF(s) 
C) Na(s)+ F2(g)→ NaF2(s) 
D) 2 Na(s)+ F2(g)→ Na2F2(s)

Question 14

Identify the correct product that would complete the following double displacement reaction: NaOH + HBr → ___ + H2O

Accepted Answer

A) HBr 
B) NaH 
C) NaBr 
D) OBr2 
E) None of the choices are correct. 
A) HBr 
B) NaH 
C) NaBr 
D) OBr2 
E) None of the choices are correct.

Question 15

_____ results in the loss of oxygen atoms or the gain of hydrogen atoms.

Accepted Answer

The answer of _____ results in the loss of oxygen...

Question 16

One term in a balanced chemical equation contains the coefficient 4 in front of the formula Mg3(PO4)2. This term represents that there are 12 Mg atoms,4 P atoms,and 16 O atoms in this term.

Accepted Answer

A) True 
 B)False

Question 17

In the balanced redox reaction: 2 Cu(s)+ S(s)→ 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 18

The actual yield is the amount of product expected from a given amount of reactant based on the coefficients in the balanced chemical equation.

Accepted Answer

A) True 
 B)False

Question 19

In the balanced redox reaction: 2 C2H6(g)+ 7 O2(g)→ 4 CO2(g)+ 6 H2O(g),which species is reduced?

Accepted Answer

A) C2H6(g) 
B) O2(g) 
C) CO2(g) 
D) H2O(g) 
A) C2H6(g) 
B) O2(g) 
C) CO2(g) 
D) H2O(g)

Question 20

In the reaction: Ni2+(aq)+ Mg(s)→ Ni(s)+ Mg2+(aq),two electrons are transferred from Ni2 to Mg.

Accepted Answer

A) True 
 B)False

Exam 5: Chemical Reactions

Identify the species that is oxidized and the species that is reduced in the reaction: 2 I- + Cl2 → 2 Cl- + I2.

How many moles of carbon dioxide are in 211 g of carbon dioxide?

To multiply two numbers in scientific notation,multiply the coefficients together and multiply the exponents in the powers of 10.

The electric current generated in batteries used for portable electronic devices and pacemakers results from redox reactions.

Consider the unbalanced chemical equation: NH3 + O2 → NO + H2O. It requires 55.4 g of NH3 to completely react with 156 g of O2.

The balanced reaction: 4 NO2 + O2 + 2 H2O → 4 HNO3 states that four moles of nitrogen dioxide react with each mole of oxygen.

One mole of oxygen molecules contains more atoms than one mole of lead atoms.

The mass of one ethanol (C2H6O)molecule is 7.65 × 10-23 grams.

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

The combustion of hexane (C6H14),a component of gasoline,is represented by the balanced chemical equation: 2 C6H14(l)+ 19 O2(g)→ 12 CO2(g)+ 14 H2O(g). If 1.0 mole of hexane undergoes combustion,________ moles of O2 are required.

A mole is a quantity that contains 6.02 × 10-23 atoms,molecules,or ions.

How many grams of oxygen gas are required to completely react with 77.28 g of ethane (C2H6)in the balanced redox reaction: 2 C2H6(g)+ 7 O2(g)→ 4 CO2(g)+ 6 H2O(g)?

Sodium fluoride can be produced from the reaction between sodium metal and fluorine gas. Which of the following represents the balanced chemical equation for this reaction?

Identify the correct product that would complete the following double displacement reaction: NaOH + HBr → ___ + H2O

_____ results in the loss of oxygen atoms or the gain of hydrogen atoms.

One term in a balanced chemical equation contains the coefficient 4 in front of the formula Mg3(PO4)2. This term represents that there are 12 Mg atoms,4 P atoms,and 16 O atoms in this term.

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

The actual yield is the amount of product expected from a given amount of reactant based on the coefficients in the balanced chemical equation.

In the balanced redox reaction: 2 C2H6(g)+ 7 O2(g)→ 4 CO2(g)+ 6 H2O(g),which species is reduced?

In the reaction: Ni2+(aq)+ Mg(s)→ Ni(s)+ Mg2+(aq),two electrons are transferred from Ni2 to Mg.

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

Identify the species that is oxidized and the species that is reduced in the reaction: 2 I^- + Cl₂ → 2 Cl^- + I₂.

Consider the unbalanced chemical equation: NH₃ + O₂ → NO + H₂O. It requires 55.4 g of NH₃ to completely react with 156 g of O₂.

The balanced reaction: 4 NO₂ + O₂ + 2 H₂O → 4 HNO₃ states that four moles of nitrogen dioxide react with each mole of oxygen.

The mass of one ethanol (C₂H₆O)molecule is 7.65 × 10^-23 grams.

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

The combustion of hexane (C₆H₁₄),a component of gasoline,is represented by the balanced chemical equation: 2 C₆H₁₄(l)+ 19 O₂(g)→ 12 CO₂(g)+ 14 H₂O(g). If 1.0 mole of hexane undergoes combustion,________ moles of O₂ are required.

A mole is a quantity that contains 6.02 × 10^-23 atoms,molecules,or ions.

How many grams of oxygen gas are required to completely react with 77.28 g of ethane (C₂H₆)in the balanced redox reaction: 2 C₂H₆(g)+ 7 O₂(g)→ 4 CO₂(g)+ 6 H₂O(g)?

Identify the correct product that would complete the following double displacement reaction: NaOH + HBr → ___ + H₂O

One term in a balanced chemical equation contains the coefficient 4 in front of the formula Mg₃(PO₄)₂. This term represents that there are 12 Mg atoms,4 P atoms,and 16 O atoms in this term.

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

In the balanced redox reaction: 2 C₂H₆(g)+ 7 O₂(g)→ 4 CO₂(g)+ 6 H₂O(g),which species is reduced?

In the reaction: Ni²⁺(aq)+ Mg(s)→ Ni(s)+ Mg²⁺(aq),two electrons are transferred from Ni²to Mg.