Question 1

Consider the reaction shown:
304.0 kcal + 4 PCl3(l)→ P4(s)+ 6 Cl2(g)
When 50.00 g of PCl3 react,________ kcal will be ________.

Accepted Answer

A) 304.0;produced 
B) 27.67;produced 
C) 304.0;consumed 
D) 110.7;consumed 
E) 27.67;consumed 
A) 304.0;produced 
B) 27.67;produced 
C) 304.0;consumed 
D) 110.7;consumed 
E) 27.67;consumed E

Question 2

Write the equilibrium expression for the following reaction:
4 HNO3(l) 4 NO2(g)+ 2 H2O(g)+ O2(g)

Accepted Answer

A) [NO2]4 [H2O]2 [O2]/[HNO3]4 
B) 1/[NO2]4 [H2O]2 [O2] 
C) [HNO3]4/[NO2]4 [H2O]2 [O2] 
D) [NO2]4 [H2O]2 [O2] 
E) [NO2]4 + [H2O]2 + [O2] 
A) [NO2]4 [H2O]2 [O2]/[HNO3]4 
B) 1/[NO2]4 [H2O]2 [O2] 
C) [HNO3]4/[NO2]4 [H2O]2 [O2] 
D) [NO2]4 [H2O]2 [O2] 
E) [NO2]4 + [H2O]2 + [O2] D

Question 3

Select the correct figure to match the description.
-A slow reaction with a large negative free energy change

Accepted Answer

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

Question 4

Select the correct figure to match the description.
-A fast reaction with a large negative free energy change

Accepted Answer

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

Question 5

Which of the following can affect the activation energy of a reaction?

Accepted Answer

A) increase in concentration of products 
B) increase in concentration of reactants 
C) surface area of reactants 
D) use of a catalyst 
E) temperature of the reaction 
A) increase in concentration of products 
B) increase in concentration of reactants 
C) surface area of reactants 
D) use of a catalyst 
E) temperature of the reaction

Question 6

Consider the reaction shown:
N2 + O2 → 2 NO ΔH = 43.2 kcal
When 50.0 g of N2 react,________ kcal will be ________.

Accepted Answer

A) 43.2;produced 
B) 77.1;consumed 
C) 77.1;produced 
D) 2160;consumed 
E) 2160;produced 
A) 43.2;produced 
B) 77.1;consumed 
C) 77.1;produced 
D) 2160;consumed 
E) 2160;produced

Question 7

Based on the reaction shown,which statement is true?
P4(s)+ 10 Cl2(g)→ 4 PCl5(s)ΔH = -435.2 kcal

Accepted Answer

A) When 1 mol P4(s)reacts,435.2 kcal are released. 
B) When 1 mol PCl5(s) is produced,435.2 kcal are released. 
C) When 30.97 g P4(s)react,435.2 kcal are released. 
D) When 123.88 g P4(s)react,435.2 kcal are consumed. 
E) When 208.22 g PCl5(s) are produced,435.2 kcal are consumed. 
A) When 1 mol P4(s)reacts,435.2 kcal are released. 
B) When 1 mol PCl5(s) is produced,435.2 kcal are released. 
C) When 30.97 g P4(s)react,435.2 kcal are released. 
D) When 123.88 g P4(s)react,435.2 kcal are consumed. 
E) When 208.22 g PCl5(s) are produced,435.2 kcal are consumed.

Question 8

In the reaction A + B → AB,which of the following will not increase the rate?

Accepted Answer

A) adding A 
B) adding B 
C) increasing the temperature 
D) decreasing the temperature 
E) adding a catalyst 
A) adding A 
B) adding B 
C) increasing the temperature 
D) decreasing the temperature 
E) adding a catalyst

Question 9

Which statement best describes the way a catalyst works?

Accepted Answer

A) It decreases the value of ΔH. 
B) It increases the value of ΔH. 
C) It decreases the value of Eact. 
D) It increases the value of Eact. 
E) It increases the value of ΔG. 
A) It decreases the value of ΔH. 
B) It increases the value of ΔH. 
C) It decreases the value of Eact. 
D) It increases the value of Eact. 
E) It increases the value of ΔG.

Question 10

Match the following.
-A process or reaction which consumes heat

Accepted Answer

A) exothermic 
B) activation energy 
C) chemical equilibrium 
D) endergonic 
E) exergonic
F)endothermic 
A) exothermic 
B) activation energy 
C) chemical equilibrium 
D) endergonic 
E) exergonic
F)endothermic

Question 11

A reaction that is spontaneous can be described as

Accepted Answer

A) proceeding in both the forward and reverse directions. 
B) having the same rate in both the forward and reverse directions. 
C) releasing heat to the surroundings. 
D) proceeding without external influence once it has begun. 
E) increasing in disorder. 
A) proceeding in both the forward and reverse directions. 
B) having the same rate in both the forward and reverse directions. 
C) releasing heat to the surroundings. 
D) proceeding without external influence once it has begun. 
E) increasing in disorder.

Question 12

Which of the following will affect all reaction rates?

Accepted Answer

A) the temperature of the reactants 
B) the concentrations of the reactants 
C) the presence of a catalyst 
D) All are correct. 
A) the temperature of the reactants 
B) the concentrations of the reactants 
C) the presence of a catalyst 
D) All are correct.

Question 13

Select the correct figure to match the description.
-A slow reaction with a large positive free energy change

Accepted Answer

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

Question 14

A reaction is said to be ________ if the bonds formed during the reaction are stronger than the bonds broken.

Accepted Answer

A) exothermic 
B) endothermic 
C) exergonic 
D) endergonic 
E) spontaneous 
A) exothermic 
B) endothermic 
C) exergonic 
D) endergonic 
E) spontaneous

Question 15

-In the reaction energy diagrams shown,reaction B is ________,and it occurs ________ reaction B.

Accepted Answer

A) endergonic;faster than 
B) exergonic;faster than 
C) endergonic;slower than 
D) exergonic;slower than 
E) exergonic;at the same rate as 
A) endergonic;faster than 
B) exergonic;faster than 
C) endergonic;slower than 
D) exergonic;slower than 
E) exergonic;at the same rate as

Question 16

In order to determine if a reaction is at equilibrium which of the following must be true?

Accepted Answer

A) The concentrations of the reactants and products must be equal. 
B) The concentration of the products must be greater than the reactants. 
C) The forward and reverse reactions have stopped. 
D) The rate at which the forward and reverse reactions are proceeding are equal. 
E) All of the above are true. 
A) The concentrations of the reactants and products must be equal. 
B) The concentration of the products must be greater than the reactants. 
C) The forward and reverse reactions have stopped. 
D) The rate at which the forward and reverse reactions are proceeding are equal. 
E) All of the above are true.

Question 17

Which of the following contains potential energy?

Accepted Answer

A) person riding a bicycle 
B) a book on a table 
C) a bouncing ball 
D) a kid jumping rope 
E) dancing 
A) person riding a bicycle 
B) a book on a table 
C) a bouncing ball 
D) a kid jumping rope 
E) dancing

Question 18

Consider the reaction shown:
452 kcal + 4 PCl5(s)→ P4(s)+ 10 Cl2(g)
This reaction is ________ because the sign of ΔH is ________.

Accepted Answer

A) endothermic;positive 
B) exothermic;positive 
C) endothermic;negative 
D) exothermic;negative 
E) exothermic;neither positive nor negative 
A) endothermic;positive 
B) exothermic;positive 
C) endothermic;negative 
D) exothermic;negative 
E) exothermic;neither positive nor negative

Question 19

When a reaction system is at equilibrium

Accepted Answer

A) there is no more chemistry happening. 
B) the amounts of reactants and products are exactly equal. 
C) the reaction rate in the forward direction is at a maximum. 
D) the reaction rate in the reverse direction is at a minimum. 
E) the rates of the reaction in the forward and reverse directions are exactly equal. 
A) there is no more chemistry happening. 
B) the amounts of reactants and products are exactly equal. 
C) the reaction rate in the forward direction is at a maximum. 
D) the reaction rate in the reverse direction is at a minimum. 
E) the rates of the reaction in the forward and reverse directions are exactly equal.

Question 20

Calculate the equilibrium constant for the reaction below if a tank was found to contain 0.106 M O2,0.00652 M SO3, and 0.00129 M SO2.
2 SO3(g) 2 SO2(g)+ O2(g)

Accepted Answer

A) 6.78 × 10-2 
B) 1.34 × 10-2 
C) 4.15 × 10-3 
D) 4.35 × 10-2 
E) 9.66 × 10-3 
A) 6.78 × 10-2 
B) 1.34 × 10-2 
C) 4.15 × 10-3 
D) 4.35 × 10-2 
E) 9.66 × 10-3

Exam 7: Chemical Reactions: Energy, rates, and Equilibrium

Consider the reaction shown: 304.0 kcal + 4 PCl3(l)→ P4(s)+ 6 Cl2(g) When 50.00 g of PCl3 react,________ kcal will be ________.

Write the equilibrium expression for the following reaction: 4 HNO3(l)4 NO2(g)+ 2 H2O(g)+ O2(g)

Select the correct figure to match the description. -A slow reaction with a large negative free energy change

Select the correct figure to match the description. -A fast reaction with a large negative free energy change

Which of the following can affect the activation energy of a reaction?

Consider the reaction shown: N2 + O2 → 2 NO ΔH = 43.2 kcal When 50.0 g of N2 react,________ kcal will be ________.

Based on the reaction shown,which statement is true? P4(s)+ 10 Cl2(g)→ 4 PCl5(s)ΔH = -435.2 kcal

In the reaction A + B → AB,which of the following will not increase the rate?

Which statement best describes the way a catalyst works?

Match the following. -A process or reaction which consumes heat

A reaction that is spontaneous can be described as

Which of the following will affect all reaction rates?

Select the correct figure to match the description. -A slow reaction with a large positive free energy change

A reaction is said to be ________ if the bonds formed during the reaction are stronger than the bonds broken.

-In the reaction energy diagrams shown,reaction B is ________,and it occurs ________ reaction B.

In order to determine if a reaction is at equilibrium which of the following must be true?

Which of the following contains potential energy?

Consider the reaction shown: 452 kcal + 4 PCl5(s)→ P4(s)+ 10 Cl2(g) This reaction is ________ because the sign of ΔH is ________.

When a reaction system is at equilibrium

Calculate the equilibrium constant for the reaction below if a tank was found to contain 0.106 M O2,0.00652 M SO3, and 0.00129 M SO2. 2 SO3(g)2 SO2(g)+ O2(g)

Matter and Measurements

Atoms and the Periodic Table

Ionic Compounds

Molecular Compounds

Classification and Balancing of Chemical Reactions

Chemical Reactions: Mole and Mass Relationships

Gases, liquids, and Solids

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Chemistry: Alkanes

Alkenes, alkynes, and Aromatic Compounds

Some Compounds With Oxygen, sulfur, or a Halogen

Aldehydes and Ketones

Amines

Carboxylic Acids and Their Derivatives

Amino Acids and Proteins

Enzymes and Vitamins

Carbohydrates

The Generation of Biochemical Energy

Carbohydrate Metabolism

Lipids

Lipid Metabolism

Protein and Amino Acid Metabolism

Nucleic Acids and Protein Synthesis

Genomics

Chemical Messengers: Hormones, neurotransmitters, and Drugs

Body Fluids

Filters

Consider the reaction shown: 304.0 kcal + 4 PCl₃(l)→ P₄(s)+ 6 Cl₂(g) When 50.00 g of PCl₃ react, kcal will be .

Write the equilibrium expression for the following reaction: 4 HNO₃(l)4 NO₂(g)+ 2 H₂O(g)+ O₂(g)

Consider the reaction shown: N₂ + O₂ → 2 NO ΔH = 43.2 kcal When 50.0 g of N₂ react, kcal will be .

Based on the reaction shown,which statement is true? P₄(s)+ 10 Cl₂(g)→ 4 PCl₅(s)ΔH = -435.2 kcal

-In the reaction energy diagrams shown,reaction B is ,and it occurs reaction B.

Consider the reaction shown: 452 kcal + 4 PCl₅(s)→ P₄(s)+ 10 Cl₂(g) This reaction is because the sign of ΔH is .

Calculate the equilibrium constant for the reaction below if a tank was found to contain 0.106 M O₂,0.00652 M SO_3, and 0.00129 M SO₂. 2 SO₃(g)2 SO₂(g)+ O₂(g)