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- 1. Multiple ChoiceHeat flows from _______ to ______ objectscooler to warmerwarmer to warmerwarmer to coolercooler to cooler
- 2. Multiple ChoiceHeat is measured injoulesgramsdegrees celcius
- 3. Multiple ChoiceEnergy can not be created or destroyed, it can only be transferred refers to the....law of conservation of energylaw of conservation of masslife factslaw of conservation of chemistry
- 4. Multiple ChoiceThe specific heat(c) of copper is 0.39 J/g °C. What is the temperature change(∆t) when 100 Joules of heat(Q) is added to 20 grams?12.82 °C24.12°C351 °C
- 5. Multiple ChoiceH2 + 2 C + N2 + 270.3 kJ --> 2 HCN
Is this reaction endothermic or exothermic?EndothermicExothermic - 6. Multiple ChoiceA chemical reaction that absorbs heat from the surroundings is said to be __________ and has a __________ ΔH at constant pressure.endothermic; positiveendothermic; negativeexothermic; negativeexothermic; positive
- 7. Multiple Choice
What kind of graph is this?endothermicexothermic - 8. Multiple Choice
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A calorimeter holds 125 g water at 22.0°C. A 45 g sample of silver at 130.0°C is added to the water, and the final temperature of the water and silver is 24.2°C. The specific heat of water is 4.18 J/g°C. What is the specific heat of silver?
0.241 J/g°C
2.16 J/g°C
51.8 J/g°C
558 J/g°C
- 9. Multiple Choice
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How does an exothermic reaction compare with an endothermic reaction?
Both changes absorb energy as reactants become products.
Both changes release energy as reactants become products.
An exothermic reaction absorbs energy, and an endothermic reaction releases energy.
An endothermic reaction absorbs energy, and an exothermic reaction releases energy.
- 10. Multiple Choice
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What observation would indicate that an endothermic reaction is occurring in a beaker?
The beaker glows.
The contents of the beaker become a solid.
The contents of the beaker change color.
The beaker feels cool.
- 11. Multiple Choice
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Which statement correctly describes an endothermic process?
Energy is absorbed.
Energy is released.
Matter is absorbed.
Matter is released.
- 12. Multiple Choice
Where is chemical potential energy stored?
in atoms
in thermal energy
in chemical reactions
in chemical bonds
- 13. Multiple ChoiceHow much energy is required to heat up 12kg of copper from 10 °C to 120 °C. The specific heat capacity is 390 J/kg °C.46800 J561600 J514800 J
- 14. Multiple ChoiceWhat happens to particles as they heat up?They slow downNothingThey don't moveThey speed up
- 15. Multiple ChoiceWhat type of reaction is this?EndothermicExothermic
- Answer choicesTagsAnswer choicesTags