AnswersSY2026-27 - 2003340 Chemistry 1 Sem 2 CRWriting and Balancing Chemical Equations

Reaction Pathways Answers

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Iron(II) chloride is formed from the reaction between iron and copper(II) chloride.Fe + CuCl2 FeCl2 + CuIf the reactants have Hf = –256 kJ mol–1 and the products have Hf = –321 kJ mol–1, which reaction pathway graph would have a similar shape to this reaction?

Question illustration
A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D
2
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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.
3

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

A
mainly downhill
B
always linear
C
always parabolic
D
mainly uphill
4

Consider the reaction pathway graph below.Which statement best describes this graph?

Question illustration
A
This is an exothermic reaction with a positive Hrxn.
Option A
B
This is an exothermic reaction with a negative Hrxn.
Option B
C
This is an endothermic reaction with a positive Hrxn.
Option C
D
This is an endothermic reaction with a negative Hrxn.
Option D
5

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.
6

Which statement best describes how activation energy influences a reaction?

A
The greater the activation energy, the greater the enthalpy of reaction.
B
The lower the activation energy, the more energy is released.
C
The greater the activation energy, the lower the reaction rate.
D
The lower the activation energy, the lower the energy of the products.
7

Consider the diagram below.What does C represent?

Question illustration
A
enthalpy of reaction
B
activation energy
C
activated complex
D
energy of the reactants
8

Consider the reaction pathway graph below.Which process would produce a similar pathway?

Question illustration
A
condensation
B
dehydration
C
decomposition
D
melting
9

Consider the reaction pathway graph below.Which can be used to determine the H?

Question illustration
A
E and D
B
A and B
C
F only
D
G only
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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