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Study Quiz 2
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1
Which of the following is true?
A)In an exothermic reaction, the products are more energetically stable than the reactants.
B)In an endothermic reaction, the products are more energetically stable than the reactants.
C)In an endothermic reaction, the overall difference in potential energy is the amount of energy that is released by the reaction.
D)In an exothermic reaction, the overall difference in potential energy is the amount of energy that is absorbed by the reaction.
2
Which of the following is true?
A)The chemical species that exists at the transition state is highly stable.
B)The chemical species that exists at the transition state is called the activated complex.
C)Both A and B.
D)Neither A or B. The chemical species that exists at the transition state is called the activated complex.
3
If ∆ E of a reaction is 230 kJ and the activation energy of the forward reaction is 150 kJ, what is the activation energy of the reverse reaction?
A)80 kJ
B)—80 kJ
C)—330 KJ
D)380 KJ
4
A single step in a series of steps that makes up an overall reaction is called a(n)
A)reaction mechanism
B)elementary reaction
C)reaction intermediate
D)transitional mechanism
5
Reaction intermediates are
A)single molecular events
B)series of steps in an overall reaction
C)molecules formed in an elementary reaction and consumed in a subsequent elementary reaction
D)substances that increase the rate of a chemical reaction without being consumed by the reaction
6
Which is true about the following reaction?
C   +   D → CD, ∆ E= 50 kj
A)It is unimolecular.
B)It is exothermic.
C)Both A and B
D)Neither A or B
7
Molecularity refers to
A)the number of product particles produced
B)the total number of reactant and product particles
C)the number of reactant particles involved in an elementary reaction
D)none of the above
8
The rate-determining step
A)has an activation energy barrier that is greater than the activation energy barrier of the other steps in a reaction
B)is the fastest step in a reaction
C)is always the last step in a series
D)all of the above





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