AnswersChemistry Credit Recovery BEnthalpy of Reaction

Enthalpy of Reaction Answers

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Consider the intermediate chemical reactions.The final overall chemical equation is . When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation

Question illustration
A
is halved and has its sign changed.
B
is halved.
C
has its sign changed.
D
is unchanged.
2
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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.
3

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).
4

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.
5

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.
6

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.
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 reactions.The overall chemical reaction is as follows.What is the correct enthalpy diagram using the Hess law for this system?

Question illustration
A
mc019-3.jpg
Option A
B
mc019-4.jpg
Option B
C
mc019-5.jpg
Option C
D
mc019-6.jpg
Option D
9

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
10

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

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