Question 1

A carbohydrate sample weighing 0.235 g was found to have a fuel value of 3.84 kJ.What is the fuel value of one gram of this carbohydrate, in nutritional Calories?

Accepted Answer

A)  3,910 Cal
B)  0.535 Cal
C)  16.3 Cal
D)  643 Cal
E)  3.91 Cal

Question 2

Which statement concerning energy changes in chemical reactions is FALSE?

Accepted Answer

A)  The breaking of bonds requires energy, and the formation of bonds releases energy.
B)  Activation energy is the minimum amount of energy required to initiate a chemical reaction.
C)  A reaction is exothermic if the products have a lower energy than the reactants.
D)  A reaction is endothermic if the reactants have a lower energy than the products.
E)  The overall change in enthalpy (∆H)  for a reaction is determined by the difference in energy between the products and the activated complex.

Question 3

Ethylene glycol has a specific heat of 0.578 cal/(g•°C) .If 23.2 g of ethylene glycol absorbs 75.6 cal of heat energy, what will the temperature increase be?

Accepted Answer

A)  0.177°C
B)  1.88°C
C)  5.64°C
D)  1.01 × 103 °C
E)  3.03 × 103 °C

Question 4

Which of the following pairs of substances has the substance with the highest entropy listed first?

Accepted Answer

A)  Ni(s) , Br2(l) 
B)  Hg(l) , He(g) 
C)  Br2(l) , H2O(g) 
D)  Ne(g) , H2O(l) 
E)  Ni(s) , Br2(l)  and Ne(g) , H2O(l)  are correct.

Question 5

The rate of a chemical reaction increases with an increase in concentration of one or more of the reactants.This is best explained by which of the following statements?

Accepted Answer

A)  The increased concentration of the reactants increases the temperature of the molecules.
B)  The increased concentration of the reactants increases the activation energy of the reaction.
C)  The increased concentration of the reactants increases the speed of the molecules.
D)  The increased concentration of the reactants increases the frequency of effective collisions.
E)  The increased concentration of the reactants decreases the activation energy.

Question 6

In kinetics, the order of a reaction

Accepted Answer

A)  is the inverse of the entropy of the system.
B)  must be measured experimentally.
C)  can be deduced from the balanced equation for the reaction.
D)  depends on the rate constant.
E)  depends on the concentrations of reactants.

Question 7

A reaction that leads to an increase in the entropy of the system is always spontaneous.

Accepted Answer

A) True 
 B)False

Question 8

A catalyst increases the equilibrium constant for a reaction.

Accepted Answer

A) True 
 B)False

Question 9

Which statement concerning a reversible reaction at equilibrium is FALSE?

Accepted Answer

A)  The concentration of the products is equal to the concentration of the reactants.
B)  The forward and reverse reaction rates are equal.
C)  There is no further change in the amount of reactants and products.
D)  A stress to the system would cause the system to shift in the direction that best relieves the stress.
E)  All of the statements are true for a reversible reaction at equilibrium.

Question 10

Which of the following statements concerning the reaction below is FALSE? 2HgO(s)  → 2Hg(l)  + O2(g)  ∆H = 182 kJ

Accepted Answer

A)  There is an increase in entropy in this reaction.
B)  This reaction is endothermic.
C)  182 kJ of energy are required for every two moles of HgO that react.
D)  The energy of the reactants is greater than the energy of the products.
E)  The system absorbs energy from the surroundings in this reaction.

Question 11

Consider the reversible reaction:
 What is the correct expression for the equilibrium constant, Keq, for this reaction?

Accepted Answer

The answer of Consider the reversible reaction:
 What is the...

Question 12

When a sample of aqueous hydrochloric acid was neutralized with aqueous sodium hydroxide in a calorimeter, the temperature of 100.0 g of water surrounding the reaction increased from 25.0°C to 31.5°C.If the specific heat of water is 1.00 cal/(g•°C) , calculate the quantity of energy in calories involved in this neutralization reaction.

Accepted Answer

A)  1000 cal
B)  100.0 cal
C)  6.50 cal
D)  1250 cal
E)  650 cal

Question 13

For the reaction A(g)  → 2B(g) , Keq = 4.5 × 105.Which statement is TRUE for the system at equilibrium?

Accepted Answer

A)  [A] >> [B]
B)  There is twice as much B as there is A in the reaction vessel.
C)  There is more than 100 times more B than there is A in the reaction vessel.
D)  There is twice as much A as there is B in the reaction vessel.
E)  Changing the temperature will have no affect on the equilibrium.

Question 14

Which one of the following, if changed, would change the value of the equilibrium constant, Keq, of a reaction?

Accepted Answer

A)  concentration of reactants
B)  concentration of the products
C)  temperature
D)  catalyst
E)  size of reaction vessel

Question 15

Changing the temperature alters the value of the equilibrium constant for a reaction.

Accepted Answer

A) True 
 B)False

Question 16

A reaction that leads to a decrease in the enthalpy of the system is always spontaneous.

Accepted Answer

A) True 
 B)False

Question 17

The equilibrium constant expression for a reaction can be written if the balanced equation is known.

Accepted Answer

A) True 
 B)False

Question 18

One effect of a catalyst being added to a reaction mixture is

Accepted Answer

A)  to increase the equilibrium constant for the reaction.
B)  to slow down the rate of the reverse reaction.
C)  to raise the temperature of the mixture.
D)  to provide a new pathway for the reaction.
E)  None of the choices are correct.

Question 19

Endothermic reactions are never spontaneous.

Accepted Answer

A) True 
 B)False

Question 20

How many small calories are equivalent to one nutritional Calorie?

Accepted Answer

A)  10
B)  100
C)  1,000
D)  10,000
E)  100,000

Exam 7: Energy, Rate and Equilibrium

Which one of the following, if changed, would change the value of the equilibrium constant, Keq, of a reaction?

Correct Answer
verified

For the reaction A(g) → 2B(g) , K_eq = 4.5 × 10⁵.Which statement is TRUE for the system at equilibrium?

Correct Answer
verified

A reaction that leads to a decrease in the enthalpy of the system is always spontaneous.

Correct Answer
verified

How many small calories are equivalent to one nutritional Calorie?

Correct Answer
verified

The rate of a chemical reaction increases with an increase in concentration of one or more of the reactants.This is best explained by which of the following statements?

Correct Answer
verified

In kinetics, the order of a reaction

Correct Answer
verified

Which statement concerning energy changes in chemical reactions is FALSE?

Correct Answer
verified

A reaction that leads to an increase in the entropy of the system is always spontaneous.

Correct Answer
verified

Which of the following pairs of substances has the substance with the highest entropy listed first?

Correct Answer
verified

Which statement concerning a reversible reaction at equilibrium is FALSE?

Correct Answer
verified

Changing the temperature alters the value of the equilibrium constant for a reaction.

Correct Answer
verified

Which of the following statements concerning the reaction below is FALSE? 2HgO(s) → 2Hg(l) + O₂(g) ∆H = 182 kJ

Correct Answer
verified

A catalyst increases the equilibrium constant for a reaction.

Correct Answer
verified

A carbohydrate sample weighing 0.235 g was found to have a fuel value of 3.84 kJ.What is the fuel value of one gram of this carbohydrate, in nutritional Calories?

Correct Answer
verified

Consider the reversible reaction: What is the correct expression for the equilibrium constant, Keq, for this reaction?

Correct Answer
verified

Ethylene glycol has a specific heat of 0.578 cal/(g•°C) .If 23.2 g of ethylene glycol absorbs 75.6 cal of heat energy, what will the temperature increase be?

Correct Answer
verified

Endothermic reactions are never spontaneous.

Correct Answer
verified

Correct Answer
verified

The equilibrium constant expression for a reaction can be written if the balanced equation is known.

Correct Answer
verified

One effect of a catalyst being added to a reaction mixture is

Correct Answer
verified

Exam 7: Energy, Rate and Equilibrium

Which one of the following, if changed, would change the value of the equilibrium constant, Keq, of a reaction?

Correct AnswerverifiedShow Answer

For the reaction A(g) → 2B(g) , Keq = 4.5 × 105.Which statement is TRUE for the system at equilibrium?

Correct AnswerverifiedShow Answer

A reaction that leads to a decrease in the enthalpy of the system is always spontaneous.

Correct AnswerverifiedShow Answer

How many small calories are equivalent to one nutritional Calorie?

Correct AnswerverifiedShow Answer

The rate of a chemical reaction increases with an increase in concentration of one or more of the reactants.This is best explained by which of the following statements?

Correct AnswerverifiedShow Answer

In kinetics, the order of a reaction

Correct AnswerverifiedShow Answer

Which statement concerning energy changes in chemical reactions is FALSE?

Correct AnswerverifiedShow Answer

A reaction that leads to an increase in the entropy of the system is always spontaneous.

Correct AnswerverifiedShow Answer

Which of the following pairs of substances has the substance with the highest entropy listed first?

Correct AnswerverifiedShow Answer

Which statement concerning a reversible reaction at equilibrium is FALSE?

Correct AnswerverifiedShow Answer

Changing the temperature alters the value of the equilibrium constant for a reaction.

Correct AnswerverifiedShow Answer

Which of the following statements concerning the reaction below is FALSE? 2HgO(s) → 2Hg(l) + O2(g) ∆H = 182 kJ

Correct AnswerverifiedShow Answer

A catalyst increases the equilibrium constant for a reaction.

Correct AnswerverifiedShow Answer

A carbohydrate sample weighing 0.235 g was found to have a fuel value of 3.84 kJ.What is the fuel value of one gram of this carbohydrate, in nutritional Calories?

Correct AnswerverifiedShow Answer

Consider the reversible reaction: What is the correct expression for the equilibrium constant, Keq, for this reaction?

Correct AnswerverifiedShow Answer

Ethylene glycol has a specific heat of 0.578 cal/(g•°C) .If 23.2 g of ethylene glycol absorbs 75.6 cal of heat energy, what will the temperature increase be?

Correct AnswerverifiedShow Answer

Endothermic reactions are never spontaneous.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The equilibrium constant expression for a reaction can be written if the balanced equation is known.

Correct AnswerverifiedShow Answer

One effect of a catalyst being added to a reaction mixture is

Correct AnswerverifiedShow Answer

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verified

For the reaction A(g) → 2B(g) , K_eq = 4.5 × 10⁵.Which statement is TRUE for the system at equilibrium?

Correct Answer
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Which of the following statements concerning the reaction below is FALSE? 2HgO(s) → 2Hg(l) + O₂(g) ∆H = 182 kJ

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