Q: Which equation correctly expresses the linear thermal expansion of a solid?

$$\\Delta L = \\alpha L_0$ \\Delta T$$

Q: Which gas law explains why a balloon expands when heated at constant pressure?

Charles's Law: $$\\frac{V}{T} = k$$

Q: A 0.5 kg sample of water is heated from 20°C to 80°C. If the specific heat capacity of water is $$4200 \\ \mathrm{J/kg\\cdot K}$$, how much heat is required?

$$Q = mc\\Delta T = 0.5 \\times 4200 \\times 60 = 126,000 \\ \mathrm{J}$$

Question 1

Which of the following best describes the Zeroth Law of Thermodynamics?

Accepted Answer

If two systems are each in thermal equilibrium with a third system, then they are in thermal equilibrium with each other.

Question 2

A metal rod is heated at one end. Which heat transfer mechanism is primarily responsible for the increase in temperature at the other end of the rod?

Accepted Answer

Conduction

Question 3

Which equation correctly expresses the linear thermal expansion of a solid?

Accepted Answer

$$\Delta L = \alpha L_0$ \Delta T$$

Question 4

A 2 kg block of ice at 0°C is placed in contact with 1 kg of water at 50°C in an insulated container. Which process will occur first?

Accepted Answer

The ice will absorb heat and begin to melt.

Question 5

Which of the following statements about specific heat capacity is correct?

Accepted Answer

Specific heat capacity is the amount of heat required to raise the temperature of 1 kg of a substance by 1 K.

Question 6

Which gas law explains why a balloon expands when heated at constant pressure?

Accepted Answer

Charles's Law: $$\frac{V}{T} = k$$

Question 7

A 0.5 kg sample of water is heated from 20°C to 80°C. If the specific heat capacity of water is $$4200 \ \mathrm{J/kg\cdot K}$$, how much heat is required?

Accepted Answer

$$Q = mc\Delta T = 0.5 \times 4200 \times 60 = 126,000 \ \mathrm{J}$$

Question 8

Which of the following is NOT a mechanism of heat transfer?

Accepted Answer

Compression

Question 9

According to the first law of thermodynamics, which equation correctly relates the change in internal energy ($$\Delta U$$), heat ($$Q$$), and work ($$W) $$done by the system?

Accepted Answer

$$\Delta U = Q - W$$

Question 10

Which of the following best describes entropy in the context of the second law of thermodynamics?

Accepted Answer

Entropy quantifies the spread or dispersal of thermal energy.

Question 11

Which process is primarily responsible for the warming of the Earth's surface by the greenhouse effect?

Accepted Answer

Absorption and re-emission of infrared radiation by greenhouse gases

Question 12

A gas is compressed in a cylinder, and its temperature increases. Which statement best explains this observation?

Accepted Answer

Work is done on the gas, increasing its internal energy.

Question 13

Which of the following is an example of heat transfer by convection?

Accepted Answer

Warm air rising above a radiator in a room

Question 14

Which of the following best describes latent heat?

Accepted Answer

The energy required to change the phase of 1 kg of a substance without changing its temperature

Question 15

If the temperature of a gas is increased at constant volume, what happens to its pressure according to Gay-Lussac's Law?

Accepted Answer

The pressure increases.

Question 16

Which of the following is a real-world consequence of the enhanced greenhouse effect?

Accepted Answer

Rising global temperatures and more extreme weather events

Question 17

A 1 kg block of aluminum (specific heat $$900 \ \mathrm{J/kg\cdot K}) $$and a 1 kg block of copper (specific heat $$390 \ \mathrm{J/kg\cdot K}) $$are both heated by 1000 J. Which block experiences the greater temperature increase?

Accepted Answer

The copper block

Question 18

Which of the following best explains why water is effective at moderating Earth's climate?

Accepted Answer

Water has a high specific heat capacity, so it absorbs and releases heat slowly.

Question 19

Which of the following is the correct SI unit for entropy?

Accepted Answer

$$\mathrm{J/K}$$

Question 20

A closed system exchanges energy with its surroundings only as:

Accepted Answer

Heat and work

Heat and Thermodynamics: Study Notes

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