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

Enthalpy of Reaction Answers

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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.
2
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Consider the following intermediate chemical equations.Which overall chemical equation is obtained by combining these intermediate equations?

Question illustration
A
Upper C upper H subscript 4 plus 2 upper O subscript 2 (g) right arrow upper C upper O subscript 2 (g) plus 2 upper H subscript 2 upper O (l).
Option A
B
Upper C upper H subscript 4 plus 2 upper O subscript 2 (g) right arrow upper C upper O subscript 2 (g) plus 2 upper H subscript 2 upper O (g).
Option B
C
Upper C upper H subscript 4 plus 2 upper O subscript 2 (g) right arrow upper C upper O subscript 2 (g) plus 4 upper H subscript 2 upper O (g) plus 2 upper H subscript 2 upper O (l).
Option C
D
Upper C upper H subscript 4 plus 2 upper O subscript 2 (g) right arrow upper C upper O subscript 2 (g) plus 6 upper H subscript 2 upper O (g).
Option D
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

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
6

What is enthalpy?

A
the total concentration of the system
B
the total heat content of the system
C
the total pressure of the system
D
the total disorder of the system
7

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).
8

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
9

What is the final chemical equation from the following intermediate chemical equations?

Question illustration
A
Upper P subscript 4 upper O subscript 6 (s) plus 2 upper O subscript 2 (g) right arrow upper P subscript 4 upper O subscript 10 (s).
Option A
B
Upper P subscript 4 upper O subscript 6 (s) plus 8 upper O subscript 2 (g) right arrow 2 upper P subscript 4 (s) plus upper P subscript 4 upper O subscript 10 (s).
Option B
C
Upper P subscript 4 upper O subscript 6 (s) plus 15 upper O subscript 2 (g) right arrow upper P subscript 4 (s) plus upper P subscript 4 upper O subscript 10 (s).
Option C
D
Upper P subscript 4 upper O subscript 6 (s) StartFraction 5 over 3 EndFraction upper O subscript 2 (g) right arrow upper P subscript 4 upper O subscript 10 (s).
Option D
10

If a chemical reaction is reversed, what happens to the enthalpy of the reaction?

A
The enthalpy of the reaction becomes zero.
B
The enthalpy of the reaction doubles.
C
The sign of the enthalpy of the reaction reverses.
D
The enthalpy of the reaction is halved.

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Enthalpy of Reaction Answers — SY2026-27 …