Thermochemistry Pre-Exam Review

Hot water rises and cold water sinks. Is this:

• Convection

• Conduction

• Radiation

The sun shines down on this family as the play on the beach.

• conduction
• convection
• radiation

Cold Pack on Person

• Heat is transferred from the cold pack to the person.

• Heat is transferred from the person to the cold pack

• The cold pack is getting colder. The person is getting warmer.

What is the symbol for Thermal Energy?

• Q
• t
• m
• C

The amount of energy required to raise the temperature 1ºC for every kilogram is called____?

• Thermal Energy
• Specific Heat
• Temperature
• Kinetic Energy

A material was cooled from 100ºC to 40ºC.  What is the temperature change?

• 60ºC
• 40ºC
• -60ºC
• -40ºC

What is the change in temperature when 50,000 Joules of energy is added to 200 grams of water at 25 C?

• 0.016 C
• 1,500 C
• 63 C
• 0.4 C

What unit do you use to measure Thermal Energy?

• J/Kg ºC
• Kg
• ºC
• J

The specific heat of aluminum is 0.21 cal/g°C.  How much heat(Q) is released when a 10 g piece of aluminum foil is taken out of the oven and cools from 100° to 50°?

• 105 J
• 10.5 J
• 1.05 J
• 50 J

20 g of water. specific heat of water is 4.18 J/g°C.  temperature changes from 25° C to 20° C, how much heat energy (Q) moves from the water to the surroundings?

• 418 Joules
• 209 J
• 83 J
• 4.18 J