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8 x 10 9 2 x 10 9 8 x 10 6 32 x 10 2 8 x 10 3

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Determine the heat capacity (in calories/C°) of a lake containing two million gallons (approximately 8 million kilograms) of water at 15C°. Select the correct answer.

- 8 x 109
- 2 x 109
- 8 x 106
- 32 x 102
- 8 x 103

- The quantity of thermal energy exchanged by two bodies in contact is directly proportional to the difference in their temperatures.
- You only need to know the amount of thermal energy a body contains to calculate its temperature.
- The temperature of a body is directly proportional to the amount of work the body has performed.
- The quantity of thermal energy exchanged by two bodies in contact is inversely proportional to the difference in their temperatures.
- Different amounts of thermal energy are transferred between two bodies in contact if different temperature scales are used to measure the temperature difference between the bodies.

- An isothermal compression of an ideal gas.
- An isobaric expansion of an ideal gas.
- An adiabatic expansion of an ideal gas.
- The freezing of a quantity of liquid at its melting point.
- The evaporation of a quantity of a liquid at its boiling point.

- The internal energy of a system cannot change if the heat transferred to the system is equal to the work done by the system.
- A system can do work externally only if its internal energy decreases.
- The internal energy of a system that interacts with its environment must change.
- No matter what other interactions take place, the internal energy must change if a system undergoes a heat transfer.
- The only changes that can occur in the internal energy of a system are those produced by non-mechanical forces.

- no heat is transferred between a system and its surroundings
- the pressure remains constant
- the temperature remains constant
- the volume remains constant
- the internal energy is not constant

How many calories of heat are required to raise the temperature of 5 kg of water from 60° to the boiling point? Select the correct answer.

- 4.2 x 105
- 2 x 105
- 7.5 x 104
- 18 x 105
- 420

- no heat is transferred between a system and its surroundings
- the pressure remains constant
- the temperature remains constant
- the volume remains constant
- the internal energy is not constant