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- 1. Multiple ChoiceIs the combustion of gasoline endothermic or exothermic?EndothermicExothermic
- 2. Multiple ChoiceWhat is the symbol for heat?qHJ∘C
- 3. Multiple Choice
What are chemical reactions that absorb energy?
endothermic
fast
slow
exothermic
- 4. Multiple Choice
What is the study of heat changes that accompany chemical reactions and phase changes?
energy
chemistry
work
thermochemistry
- 5. Multiple Choice
What is the formula for calculating heat?
q = mcΔT
H = ΔH x moles
H = ΔH x grams
products - reactants
- 6. Multiple Choice
Convert 42 kJ into joules
0.042 J
175.73 J
42000 J
10.04 J
- 7. Multiple Choice
What are the two main types of energy?
endothermic and exothermic
spontaneous and nonspontaneous
potential and kinetic
entropy and enthalpy
- 8. Multiple Choice
Consider the reaction: 2 H2O + energy --> 2H2 + O2
exothermic because releasing energy
exothermic because absorbing energy
endothermic because absorbing energy
endothermic because releasing energy
- 9. Multiple ChoiceThe heat required to raise the temperature of a SUBSTANCE by 1∘Ccaloriejoulespecific heat4.184 J
- 10. Multiple ChoiceThe heat required to raise the temperature of WATER 1∘Ccaloriejoulespecific heatenergy
- 11. Multiple ChoiceHeat flows from _______ to ______ objectscooler to warmerwarmer to warmerwarmer to coolercooler to cooler
- 12. Multiple Choice
A 500g piece of aluminum has a temperature of 7°C. What is the heat energy produced? Specific heat of Aluminum is 0.900 J/gºC.
3000 J
3000 g
3150 J
3150 g
- 13. Multiple Choice
What does temperature measure?
heat
average kinetic energy
space
time
- 14. Multiple Choice
How much heat does an aluminum block absorb if 10.00 grams is heated from 25.0oC to 50.0oC? *Specific heat of aluminum is 0.900 J/goC
450 J
-450 J
225 J
-225 J
- 15. Multiple ChoiceDurning a phase change the temperature of a substance_________.always increasesalways decreasesalways stays the samevaries
- 16. Multiple Choice
A 24.0 gram sample of copper was heated from 25.0oC to 500.0oC, 4378 J of heat were absorbed, what is the specific heat of copper?
0.384 J/g°C
49909200 J/g°C
2.60 J/g°C
8.77 J/g°C
- 17. Multiple Choice
The specific heat of platinum is 0.133 J/g°C. How much heat is released when a 10 g piece of platinum cools from 100°C to 50°C?
66.5 J
665 J
0.0266 J
0.665 J
- 18. Multiple Choice
The temperature of an unknown piece of metal with a mass of 30.00 g changes from 25.0°C to 35.0°C when the metal absorbs 350.0 J of energy. What is the specific heat of the metal?
1.17 J/g°C
-1.17 J/g°C
0.857 J/g°C
-0.857 J/g°C
- 19. Multiple Choice
Releasing heat into the surroundings occurs during an ___________________ reaction.
Exothermic
Endothermic
Kinetic Energy
Thermal Energy
- 20. Multiple Choice
A sample of iron receives 50 J of heat energy that raises the temperature of the iron 25.0°C. If iron has a specific heat of 0.10 J/g°C, what is the mass of the iron sample?
25g
30g
20g
50g
- 21. Multiple Choice
If 238 J of heat is absorbed by a sample of metal with a mass of 40.7 g, and it raises the temperature from 20.0°C to 32.4°C, what is the specific heat capacity of the metal?
2.34 J/g°C
0.472 J/g°C
6.13 J/g°C
0.163 J/g°C
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