AnswersCR SS Chemistry S2 201819 2026Enthalpy and Phase Changes

Enthalpy of Reaction Answers

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When two intermediate chemical equations are combined, the same substance that appears in the same phase can be canceled out, provided that

A
it is a reactant in one intermediate reaction and a catalyst in the other reaction.
B
it is a product in one intermediate reaction and a catalyst in the other reaction.
C
it is a reactant in one intermediate reaction and a product in the other reaction.
D
it is a reactant in both of the intermediate reactions.
2
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Consider the following intermediate chemical equations.What is the enthalpy of the overall chemical equation NO(g) + O(g) NO(g)?

Question illustration
A
-305 kJ
B
-304.1 kJ
C
-93.7 kJ
D
588.7 kJ
3

Jason combines the two intermediate steps shown.Which best describes what Jason should do with the oxygen molecules?

Question illustration
A
Place two of them as products.
B
Place two of them as reactants.
C
Cancel them out because there is one in each equation.
D
Double them because there is one in each equation.
4

Consider the following intermediate chemical equations.In the final chemical equation, HF and O are the products that are formed through the reaction between and F. Before you can add these intermediate chemical equations, you need to alter them by multiplying the

Question illustration
A
second equation by 2 and reversing the first equation.
B
first equation by 2 and reversing it.
C
first equation by (1/2) and reversing the second equation.
D
second equation by 2 and reversing it.
5

How should the enthalpy of an intermediate step be manipulated when used to produce an overall chemical equation?

A
Multiply the enthalpy by 1 if the chemical equation is reversed.
B
Multiply the enthalpy by –1 if the chemical equation is reversed.
C
Add 2 to the enthalpy if the coefficients must be doubled.
D
Add 2 to the enthalpy if the coefficients must be cut in half.
6

Consider the following intermediate chemical equations.When you combine the intermediate chemical equations, which substance do you cancel out?

Question illustration
A
P
B
Cl
Option B
C
Upper P upper C l subscript 3.
Option C
D
PCl
Option D
7

Consider the following enthalpy diagram.What is the overall enthalpy change DHrxn for the system?

Question illustration
A
-1,300 kJ
B
-300 kJ
C
300 kJ
D
1,300 kJ
8

Consider the following intermediate chemical equations.What is the enthalpy of the overall chemical reaction ?

Question illustration
A
-205.7 kJ
B
-113.4 kJ
C
-14.3 kJ
D
78.0 kJ
9

Consider the following intermediate chemical equations.In the final chemical equation, NaCl and O are the products that are formed through the reaction between and Cl. Before you can add these intermediate chemical equations, you need to alter them by

Question illustration
A
multiplying the second equation by 2.
B
multiplying the first equation by 2.
C
multiplying the first equation by (1/2).
D
multiplying the second equation by (1/4).
10

Consider the following enthalpy diagram and enthalpies of intermediate and overall chemical reactions.Which of the following statements is true?

Question illustration
A
The overall chemical reaction is exothermic.
B
There are two intermediate reactions in this system.
C
The third intermediate reaction is endothermic.
D
The longest arrow represents the overall chemical reaction.

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