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Thermochem Test Review
Test Description: Review
Instructions: Answer all questions to get your test result.
1) Endothermic reactions always raise in temperature
A
True
B
False
2) A reaction does not start with less energy than it in ends with
A
False
B
True
3) In an exothermic reaction, the system loses energy in the form of heat
A
True
B
False
4) Endothermic reactions lose energy to the surroundings
A
False
B
True
5) Change in temperature is not a chemical property
A
False
B
True
6) Energy is given off to the environment
A
False
B
True
7) Which of the following is not a type of energy?
A
kinetic
B
potential
C
chemical
D
acidic
8) What is chemical energy?
A
potential energy stored in bonds
B
energy used by a roller coaster going down hill
C
energy used when turning on a metal burner
D
energy from fire and explosions
9) What is heat Energy?
A
measured in degrees Celsius
B
how warm or cold something is
C
the amount of thermal energy in something
D
what our bodies give off to other people
10) What happens to energy when things happen?
A
when things happen we “use up our energy”
B
sometimes we waste our energy
C
it goes away
D
energy is transferred or conserved
11) Which of the following is not a way energy is transferred?
A
convection
B
radiation
C
conduction
D
concentration
12) What sign does ∆H have in exothermic reactions?
A
positive
B
neutral
C
negative
D
none of these
13) What sign does ∆H have in endothermic reactions?
A
none of these
B
positive
C
negative
D
neutral
14) What is the definition of enthalpy?
A
Change in heat content for a reaction at constant pressure
B
The unavailability of a system’s thermal energy to do work
C
Energy that transfers from one object to another because of a temperature difference between them
D
The quantity of heat required to raise the temperature of a sample of a substance one degree Celsius
15) Given the following thermochemical equation: 2NH3 + 4H2O 2NO2 + 7H2 ΔH= -142.5 kJ/mol, how much heat is released from the reaction of 20 g of H2O?
A
-99.0 kJ
B
+ 99.0 kJ
C
-6.85 kJ
D
-39.5 KJ
16) 16. 25.0 g of mercury is heated from 25°C to 155°C, and absorbs 455 joules of heat in the process. Calculate the specific heat capacity of mercury.
A
0.297 J/g0C
B
0.14 J/g0C
C
0.056 J/g0C
D
0.32 J/g0C
17) A 0.3 g piece of copper is heated and fashioned into a bracelet. The amount of energy transferred by heat to the copper is 66,300 J. If the specific heat of copper is 390 J/g 0C, what is the change of the copper's temperature?
A
602 C
B
487 C
C
587 C
D
566 C
18) 18. What mass of water will change its temperature by 3 0C when 525 J of heat is added to it? The specific heat of water is 4.18 J/g 0C
A
18.6 g
B
41.9 g
C
40.8 g
D
32.4 g
*select an answer for all questions
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