Question 1

Which of the following is true about the activation energy?

Accepted Answer

A)  It may increase by decreasing the temperature.
B)  It may decrease by decreasing the temperature.
C)  It may increase by increasing the concentration of reactants.
D)  It is practically independent of both temperature and concentration of reactants.

Question 2

Given the reaction, 2A + B2 → 2AB, which of the following factors could increase the reaction rate?
I. decreasing the temperature
II.adding a catalyst
III.increasing the surface area of solid reactants

Accepted Answer

A)  I and II
B)  II and III
C)  I and III
D)  II And III
E)  III only

Question 3

If the kinetic energy of the reactant molecules is not high enough to overcome the activation energy barrier, ________.

Accepted Answer

A)  the reverse reaction will occur
B)  no reaction takes place
C)  the reaction will occur anyway
D)  the products will form at a slower rate B

Question 4

Which of the following is an endothermic reaction?

Accepted Answer

A)  melting ice
B)  freezing water
C)  sublimation of dry ice
D)  condensing water vapor A

Question 5

-In the diagram above, the containers shown (Box A and BoxB) contain exactly the same number of reactant molecules and are at the same temperature. In which box will the rate of reaction be faster?

Accepted Answer

A)  Box A
B)  Box B
C)  Rate is about the same in each box.
D)  No way to tell which is faster from this picture.

Question 6

The magnitude (size)of the energy of activation for the reverse reaction is exactly identical as it is for the forward reaction.

Accepted Answer

A) True 
 B)False

Question 7

The energy of activation may be affected by ________.

Accepted Answer

A)  increasing the concentration of the reactants
B)  higher temperature
C)  decreasing the concentration of the reactants
D)  the presence of a catalyst

Question 8

The reaction: HCl + NaOH → H2O + NaCl is a substitution reaction.

Accepted Answer

A) True 
 B)False

Question 9

Consider the reaction C → D with the following data: Energy of reactants = 30 kJ/mole;
Energy of products = 20 kJ/mole;
Energy of transition state = 60 kJ/mole.
One can say with certainty that the reaction is ________ by ________kJ/mole and the energy of activation is ________ kJ/mole.

Accepted Answer

A)  exothermic; 10; 30
B)  endothermic; 10; 30
C)  exothermic; 40; 30
D)  endothermic; 40; 30

Question 10

The value of Ea(reaction)is equal to the difference Ea(reactants)- Ea(products).

Accepted Answer

A) True 
 B)False

Question 11

Industrial chemists often have their choice of catalysts to use when designing, for example, a factory that produces ammonia. Explain why biochemists studying life processes (such as protein metabolism)do not have the same variety of choices for which enzyme they would use.

Accepted Answer

Enzymes are specifically designed, and s...

Question 12

A catalyst can be recovered at the end of the reaction.

Accepted Answer

A) True 
 B)False

Question 13

For chemical reactions to occur at all, "old" bonds must be broken and "new" bonds must form.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following does not affect the rate of a reaction?

Accepted Answer

A)  the concentration of the reactants
B)  the energy of activation
C)  the temperature
D)  the pressure

Question 15

Consider the reaction A + B → C. Doubling the concentration of A leads to doubling the rate, while doubling the concentration of B quadruples the rate. The rate equation is, therefore, ________.

Accepted Answer

A)  Rate = -k[A][B]2
B)  Rate = -k[A]
C)  Rate = - k[A]2
D)  Rate = -k[A]2[B] A

Question 16

A high energy of activation leads to more products favored in the reaction.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following may be considered as biochemical catalysts?

Accepted Answer

A)  carbohydrates
B)  DNA
C)  enzymes
D)  lipids

Question 18

When the products are higher in energy than the reactants, the reaction is endothermic.

Accepted Answer

A) True 
 B)False

Question 19

Consider the reaction X → Y with the following data: Energy of reactants = 25 kJ/mole;
Energy of products = 75 kJ/mole;
Energy of transition state = 100 kJ/mole.
The energy of activation for the reverse reaction is ________ kJ/mole.

Accepted Answer

A)  25
B)  50.
C)  75
D)  100

Question 20

In order for a chemical reaction to occur, ________.

Accepted Answer

A)  the reactants must be in sufficient concentration
B)  the products must be of lower energy than the reactants
C)  the reactants must be of lower energy than the products
D)  the reactants must possess sufficient energy to overcome the barrier of the activation energy

Exam 13: When Reactants Turn Into Products

Which of the following is true about the activation energy?

Correct AnswerverifiedShow Answer

Given the reaction, 2A + B2 → 2AB, which of the following factors could increase the reaction rate? I. decreasing the temperature II.adding a catalyst III.increasing the surface area of solid reactants

Correct AnswerverifiedShow Answer

If the kinetic energy of the reactant molecules is not high enough to overcome the activation energy barrier, ________.

Correct AnswerverifiedB

Which of the following is an endothermic reaction?

Correct AnswerverifiedA

-In the diagram above, the containers shown (Box A and BoxB) contain exactly the same number of reactant molecules and are at the same temperature. In which box will the rate of reaction be faster?

Correct AnswerverifiedShow Answer

The magnitude (size)of the energy of activation for the reverse reaction is exactly identical as it is for the forward reaction.

Correct AnswerverifiedShow Answer

The energy of activation may be affected by ________.

Correct AnswerverifiedShow Answer

The reaction: HCl + NaOH → H2O + NaCl is a substitution reaction.

Correct AnswerverifiedShow Answer

Consider the reaction C → D with the following data: Energy of reactants = 30 kJ/mole; Energy of products = 20 kJ/mole; Energy of transition state = 60 kJ/mole. One can say with certainty that the reaction is ________ by ________kJ/mole and the energy of activation is ________ kJ/mole.

Correct AnswerverifiedShow Answer

The value of Ea(reaction)is equal to the difference Ea(reactants)- Ea(products).

Correct AnswerverifiedShow Answer

Industrial chemists often have their choice of catalysts to use when designing, for example, a factory that produces ammonia. Explain why biochemists studying life processes (such as protein metabolism)do not have the same variety of choices for which enzyme they would use.

Correct AnswerverifiedEnzymes are specifically designed, and s...View AnswerShow Answer

A catalyst can be recovered at the end of the reaction.

Correct AnswerverifiedShow Answer

For chemical reactions to occur at all, "old" bonds must be broken and "new" bonds must form.

Correct AnswerverifiedShow Answer

Which of the following does not affect the rate of a reaction?

Correct AnswerverifiedShow Answer

Consider the reaction A + B → C. Doubling the concentration of A leads to doubling the rate, while doubling the concentration of B quadruples the rate. The rate equation is, therefore, ________.

Correct AnswerverifiedA

A high energy of activation leads to more products favored in the reaction.

Correct AnswerverifiedShow Answer

Which of the following may be considered as biochemical catalysts?

Correct AnswerverifiedShow Answer

When the products are higher in energy than the reactants, the reaction is endothermic.

Correct AnswerverifiedShow Answer

Consider the reaction X → Y with the following data: Energy of reactants = 25 kJ/mole; Energy of products = 75 kJ/mole; Energy of transition state = 100 kJ/mole. The energy of activation for the reverse reaction is ________ kJ/mole.

Correct AnswerverifiedShow Answer

In order for a chemical reaction to occur, ________.

Correct AnswerverifiedShow Answer

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Given the reaction, 2A + B₂ → 2AB, which of the following factors could increase the reaction rate? I. decreasing the temperature II.adding a catalyst III.increasing the surface area of solid reactants

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B

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A

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The reaction: HCl + NaOH → H₂O + NaCl is a substitution reaction.

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Consider the reaction C → D with the following data: Energy of reactants = 30 kJ/mole; Energy of products = 20 kJ/mole; Energy of transition state = 60 kJ/mole. One can say with certainty that the reaction is by kJ/mole and the energy of activation is kJ/mole.

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The value of E_a(reaction)is equal to the difference E_a(reactants)- E_a(products).

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Enzymes are specifically designed, and s...
View Answer

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A

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