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# Determine the heat capacity in calories - PowerPoint PPT Presentation

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 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

Which of the following statements is true? Select the correct answer.

• 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.

In which process will the internal energy of the system correct answer.NOT change? Select the correct answer.

• 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.

Which statement below regarding the First Law of Thermodynamics is best? Select the correct answer.

• 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