Thermochem Test Review

___________________ is the capacity to do work or supply heat.

• energy

• heat changes

• specific heat

• thermochemistry

Ice cream melting is an example of an __________ process. (heat enters the system from the surroundings)

• endothermic

• exothermic

what does c stand for?

• heat capacity

• specific heat

• mass

• temperature

Sweating is an __________________ process because heat is released.

• endothermic

• exothermic

What device is used to measure the amount of heat involved in a chemical reaction or physical process?

• barometer

• calorimeter

• thermometer

The specific heat of aluminum is 0.21 J/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
• 0.105 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?

• 400 J
• 210 J
• 80 J
• 4.18 J

What type of reaction is shown in the picture?

• endothermic
• exothermic

What is the specific heat of an unknown substance if 100.0 g of it at 200.0 °C reaches an equilibrium temperature of 27.1 °C when it comes in contact with a calorimeter of water.  The water weighs 75. g and had an initial temperature of 20.00 °C?  (Specific heat of water is 4.18 J/g°C) (show your work)

• 0.111 J/g°C
• 1.29 J/g°C
• 0.129 J/g°C
• 22225.85 J

Compared to the potential energy of the products, the potential energy of the reactants above is?

• greater than
• less than
• the same
• impossible to determine