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Thermochemistry
Test Description: Introduction to thermochemistry, including specific heat capacity, standard heat of formation, and heats of reaction.
Instructions: Answer all questions to get your test result.
1) Which quantities must be conserved in a balanced chemical reaction?
A
Charge
B
Mass
C
All of the above
D
Energy
2) What is the specific heat capacity of an object that has a mass of 400 g, and is raised 27 degrees Celsius by 4500 Joules of energy?
A
0.961 J/gC
B
0.568 J/gC
C
0.417 J/gC
D
0.712 J/gC
3) How much energy is required to melt 92g of a substance whose heat of fusion is 0.84 J/g?
A
75.0 J
B
80.4 J
C
74.6 J
D
77.3 J
4) To find the heat of reaction, what information is required?
A
specific heat capacities of products and reactants
B
heats of formation of products and reactants
C
mass of products and reactants
D
all of the above
5) What is the heat of reaction for the following reaction? 2C2H6(g) + O2(g) --> 4CO2(g) + 6H2O(g)
A
826.6 cal
B
-745.8 cal
C
-826.6 cal
D
745.8 cal
6) What is the standard heat of formation for any element in its elemental form?
A
Depends on the element
B
Zero
C
42 J
D
Negative
7) In the case of dissolution, which of the following is considered the environment?
A
The water
B
The room
C
The container
D
The salt
8) How many joules are in 745.3 calories?
A
3115.4
B
3254.0
C
3576.4
D
3367.0
9) How much energy, in calories, are required to convert 84 g of ice to water at standard conditions?
A
6712 cal
B
12985 cal
C
117274 cal
D
8458 cal
10) Heat generally flows in which direction?
A
Heat does not flow
B
Low temperature to high temperature
C
Away
D
High temperature to low temperature
*select an answer for all questions
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