AnswersChemistry Credit Recovery BEnthalpy of Reaction

Enthalpy of Reaction Answers

10 verified answers
1
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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.
2
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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.
3

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
4

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
5

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
6

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
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

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.
9

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
10

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

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