Thermodynamics: Work and Heat

Question 1

What is the heat capacity (C) of a substance?

Answer 1

This quantifies the amount of heat required to raise the temperature of a substance by 1 Kelvin.

Question 2

What is the equation for heat capacity (C)?

Answer 2

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Question 3

What does latent heat refer to?

Answer 3

Latent heat is the range of amounts of heat applied to a substance that does not increase temperature prior to phase change

Question 4

Why does latent heat occur?

Answer 4

The hydrogen bonds are being broken or are forming

Question 5

The internal energy of a system is an extensive property. Therefore, how much is the internal energy of 5 kg of iron in comparison to 1 kg of iron at a given temperature and pressure?

1. Twice that of 1 kg iron
2. 5 times that of 1 kg iron
3. Same as that of 1 kg iron
4. 4 times that of 1 kg iron

Answer 5

2. 5 times that of 1 kg iron

Question 6

By sign convention in thermodynamics, what is the sign of the heat quantity q when heat is transferred from the surroundings to the system?

1. positive (q > 0)
2. Negative (q < 0)
3. No sign

Answer 6

1. positive (q > 0)

Question 7

By sign convention in thermodynamics, what is the sign of work (w) when work is done by the surroundings on the system?

1. positive (q > 0)
2. Negative (q < 0)
3. No sign

Answer 7

1. positive (q > 0)

Question 8

What is internal energy (U)?

Answer 8

c