AnswersCR03101 ChemistryLab: Reaction Rate

Reaction Pathways Answers

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1
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Consider the reaction pathway graph below.Which statement describes how this graph would change if the reaction could be made to go faster?

Question illustration
A
The hill would be taller.
B
The hill would be shorter.
C
C would be higher than A + B.
D
C would be equal with A + B.
2
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Consider the reaction pathway graph below.Which statement accurately describes this graph?

Question illustration
A
It represents an endothermic reaction because the product has more energy than the reactants.
B
It represents an exothermic reaction because the product has more energy than the reactants.
C
It represents an endothermic reaction because the reactants have more energy than the product.
D
It represents an exothermic reaction because the reactants have more energy than the product.
3

Consider the reaction pathway graph below.Which inference is supported by evidence in the graph?

Question illustration
A
A and C show that the reaction enthalpy is less than the activation energy.
B
G and E show that this reaction is an endothermic process with heat release.
C
B and F show that the activated complex has less energy than the reactants.
D
E and D show that the energy of the products is less than that of the reactants.
4

What happens if the amount of energy that is absorbed by the reactants is less than the activation energy?

A
The reaction does not occur.
B
The reaction occurs very quickly.
C
The reaction occurs very slowly.
D
The reaction occurs spontaneously.
5

Consider the reaction pathway graph below.Which conclusion can be accurately drawn from the graph?

Question illustration
A
Hrxn for the complete reaction is negative, but Ea is positive.
Option A
B
Hrxn for the complete reaction is positive, but Ea is negative.
Option B
C
The breakdown of ozone is an exothermic process.
D
The breakdown of ozone is an endothermic process.
6

Consider the reaction pathway graph below.What inference is supported by the graph?

Question illustration
A
The energy of the activated complex (A) is greater than that of the products (C).
B
The energy of the activated complex (B) is greater than that of the reactants (A).
C
The energy of the products (A) is greater than that of the reactants (C).
D
The energy of the reactants (B) is greater than that of the activated complex (A).
7

Which statement best describes the reaction pathway graph for endothermic reactions?

A
mainly downhill
B
always linear
C
always parabolic
D
mainly uphill
8

Which statement best describes how to read a reaction pathway graph for an endothermic reaction?

A
Reactants absorb a minimum amount of energy and then release a larger amount of energy as products form.
B
Reactants release a minimum amount of energy and then absorb a larger amount of energy as products form.
C
Reactants absorb a minimum amount of energy and then release a smaller amount of energy as products form.
D
Reactants release a minimum amount of energy and then absorb a smaller amount of energy as products form.
9

A chemical reaction has Hf,reactants = –1,023 kJ and Hf,products = –935.3 kJ. Which graph can be used to represent this reaction pathway?

Question illustration
A
mc010-3.jpg
Option A
B
mc010-4.jpg
Option B
C
mc010-5.jpg
Option C
D
mc010-6.jpg
Option D
10

Consider the reaction pathway graph below. Which inference is supported by evidence in the graph?

Question illustration
A
The energy required to make the activated complex is greater than A + C.
B
This is an exothermic reaction where the total release of energy equals A + C.
C
The products need more energy to form than the reactants as shown by F.
D
This is an endothermic reaction because most of the energy is released at A.

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Reaction Pathways Answers — CR03101 Chemistry