CHEM Unit 3 Thermochemistry Review

How much heat is lost when a 520 g piece of copper cools from 275^oC to 26^oC? (the specific heat of copper is 0.38452 J/g·^oC)

• -5.0 x 10⁴ Joules

• 5.0 x 10⁴ Joules

• -5.0 x 10^-4 Joules

• 5.0 x 10^-4 Joules

Determine the specific heat of a certain metal if a 650 gram sample of it loses 45,500 Joules of heat as its temperature drops by 95^oC.

• -0.74 J/gºC

• -1.4 J/gºC

• 1.4 J/gºC

• 0.74 J/gºC

Suppose you add the same amount of thermal energy to each of the following substances. Which substance would undergo the largest change in temperature?

• gold (0.031 cal/g°C)

• ethanol (0.584 cal/g°C)

• aluminum (0.215 cal/g°C)

• water (1.000 cal/g°C)

Which letter represents a LIQUID?

• A

• E

• J

• G

Which letter represents MELTING?

• D

• B

• H

• F

Which letter represents HEAT OF VAPORIZATION?

• D

• B

• H

• F

Which letter represents the state of matter with the highest kinetic energy?

• A

• J

• E

• C

Endothermic or Exothermic?

solid→liquid→gas

• Endothermic

• Exothermic

Endothermic or Exothermic?

Heat of Condensation

• Endothermic

• Exothermic

Endothermic or Exothermic?

Ca(s) + ½O₂(g) → CaO(s) + 635.1 kJ

• Endothermic

• Exothermic