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Thermochemistry Test
Test Description: Test
Instructions: Answer all questions to get your test result.
1) Endothermic reactions will always drop in temperature
A
True
B
False
2) A reaction starts with less energy than what it ends with.
A
False
B
True
3) In an exothermic reaction the system gains energy in the form of heat
A
True
B
False
4) Endothermic reactions absorb energy from the surroundings
A
False
B
True
5) The change in temperature is a chemical property.
A
False
B
True
6) Energy is not given off to the environment
A
True
B
False
7) Which of the following is not a type of energy?
A
chemical
B
kinetic
C
potential
D
acidic
8) What is chemical energy?
A
potential energy stored in chemical bonds
B
energy used when turning on a metal burner
C
energy used by a roller coaster going down hill
D
energy from fire and explosions
9) What is heat?
A
measured in degrees Celsius
B
the amount of thermal energy in something
C
how warm or cold something is
D
what our bodies give off to other people
10) What happens to energy when things happen?
A
sometimes we waste our energy
B
energy is transferred or conserved
C
when things happen we “use up our energy”
D
it goes away
11) Which of the following is not a way energy is transferred?
A
concentration
B
convection
C
radiation
D
conduction
12) What sign does ∆H have in exothermic reactions?
A
negative
B
positive
C
none of these
D
neutral
13) What is the definition of enthalpy?
A
Energy that transfers from one object to another because of a temperature difference between them
B
Change in heat content for a reaction at constant pressure
C
The quantity of heat required to raise the temperature of a sample of a substance one degree Celsius
D
The unavailability of a system’s thermal energy to do work
14) Considering the following equation, how much energy would be released if 50.0g of water were reacted?2NH3 + 4H2O 2NO2 + 7H2 ∆H= -142.5 kJ
A
+ 99.0 kJ
B
+6.85 kJ
C
-6.85 kJ
D
-99.0 kJ
15) Consider the following equation, how much energy would be released if 10.0g of C2H5OH were burned?C2H5OH + 3O2 2CO2 + 3H2O ∆H= -1234.7 kJ
A
-290 kJ
B
+ 290 kJ
C
-268.4 kJ
D
+268.4 kJ
16) A 50-gram piece of silver is dropped into a container of water. As it cools, the silver gives off 200 calories of heat. What is the silver’s temperature change? (The specific heat capacity of silver is 0.056 cal/g°C).
A
4.5 °C
B
560 °C
C
71.4 °C
D
5.6 x 10-6 °C
17) A 20-gram piece of copper is dropped into a container of water. As it cools, the water changes from 40 °C to 60 °C. How much heat did the copper give off? (The specific heat capacity of copper is 0.092 cal/g°C).
A
184 calories
B
4,347.8 calories
C
36.8 calories
D
54.35 calories
18) A piece of sugar free gum is burned in a bomb calorimeter containing 500 g of water. The temperature of the water increases from 25 ºC to 35 ºC. How many calories did the sugar free gum have?
A
5 calories
B
30,000 calories
C
470 calories
D
5000 calories
19) A piece of sugar free gum is burned in a bomb calorimeter containing 500 g of water. The temperature of the water increases from 25 ºC to 35 ºC. How many Calories did the sugar free gum have?
A
470 calories
B
30,000 calories
C
5 calories
D
5000 calories
*select an answer for all questions
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