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- 1. Multiple Choice
5.0 g of copper was heated from 20°C to 80°C. How much energy was used to heat Cu? (Specific heat capacity of Cu is 0.092 J/g °C)
27.6 J
36.8J
9.2 J
0.91 J
- 2. Multiple Choice
Calculate the specific heat capacity of titanium if a 43.56 g sample absorbs 0.476 kJ as its temperature changes from 20.13 C to 41.06 C
0.001 J/g°C
434.0 J/g°C
0.522 J/g°C
0.266 J/g°C
- 3. Multiple Choice
A student must use 225 g of hot water in a lab procedure. If the specific heat of water is 4.184 J/g°C Calculate the amount of heat required to raise the temperature of water from 20.0 C to 100.0 C.
94140 J
75312 J
18828 J
0.672 J
- 4. Multiple Choice
Maria finds that it takes exactly 3,748 Joules to raise the temperature of her coffee from 18°C to 80°C. If the mass of her coffee is 89 g, what is the specific heat of the coffee?
0.526 J/g°C
42.11 J/g°C
60.45 J/g°C
0.679 J/g°C
- 5. Multiple Choice
The specific heat of a substance (C), whose units are J/g°C, is defined as
The number of Joules required to raise the temperature of 1 gram of the substance 1 °C.
The change in temperature when you add 1 Joule of energy.
The number of grams created when the substance cools down 1°C.
How hot or cold that specific amount of substance is.
- 6. Multiple Choice
Is the following change of state an endothermic process or an exothermic process? H2O(l) + E --> H2O(g)
Exothermic
Endothermic
Neither endothermic or exothermic
Both endothermic and exothermic
- 7. Multiple Choice
When Julio dissolved Sodium Hydroxide in water, he noticed that the temperature of the water increased drastically. He could conclude that this dissolving process, shown below, was… NaOH(s) --> Na+ (aq) + OH-(aq)
Exothermic
Endothermic
Neither endothermic or exothermic
Both endothermic and exothermic
- 8. Multiple Choice
Iron has a specific heat of 0.449 J/g°C. How much heat is transferred to a 8.00 g piece of iron when it is heated from 15.0 °C to 45.0 °C?
13.5 J
53.9 J
107.8 J
161.6 J
- 9. Multiple Choice
A 100 g block of metal absorbs 900 Joules of thermal energy when its temperature changes from 20oC to 40oC. Calculate the specific heat of the metal.
1800000 J/g°C
0.23 J/g°C
9.00 J/g°C
0.45 J/g°C
- 10. Multiple Choice
A 21.0 g piece of an unidentified metal was heated from 19.2 oC to 66.2 oC. If 641.6J of heat energy was absorbed by the metal in the process, what is the identity of the metal? Specific Heat Table is on the board
Copper
Silver
Iron
Calcium
- 11. Multiple Choice
How much thermal energy is needed to change the temperature of 250g of Iron from 19 oC to 112 oC if the specific heat of Iron is .110 J/kg oC?
522.5 J
3080.0 J
2557.5 J
24.4 J
- 12. Multiple Choice
According to the diagram, what is ΔH for the reaction?
80 kJ
-80 kJ
240 kJ
-160 kJ
- 13. Multiple Choice
Which potential energy diagram represents the reactions Energy + A + B → C + D?
A
B
C
D
- 14. Multiple Choice
Plants absorb light energy and convert it to __________ energy during photosynthesis.
Electrical
Thermal
Kinetic
Chemical
- 15. Multiple Choice
A sample of water absorbs 50 kJ of energy when it is heated from 20oC to 60oC. The specific heat of water is 4.1J/g oC. What is the mass of the water?
6150.0 g
6.15 g
0.41 g
460.5 g
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