$$N_A = 6.02 \times 10$$^{23}$$ \text{ mol}^{-1}$$

$$1.83 \times 10^5$ \text{ Pa}$$

$$k_B = 1.38 \times 10$$^{-23}$$ \text{ J/K}$$

Question 1

Which of the following statements best describes thermal energy?

Accepted Answer

Thermal energy is the total energy of all the atoms and molecules in an object.

Question 2

A pot of water is heated on a stove. Which method of heat transfer is primarily responsible for the water at the top of the pot becoming hot?

Accepted Answer

Convection

Question 3

Which equation correctly converts a temperature from Celsius to Fahrenheit?

Accepted Answer

$$T_F = \frac{9}{5}T_C + 32$$

Question 4

A black shirt feels hotter than a white shirt on a sunny day. This is because:

Accepted Answer

Black shirts are good absorbers of radiation.

Question 5

Which of the following is the correct value for Avogadro's number?

Accepted Answer

$$N_A = 6.02 	imes 10$$^{23}$$ 	ext{ mol}^{-1}$$

Question 6

Which of the following materials is a good thermal insulator?

Accepted Answer

Wood

Question 7

If you jump into a cold lake, which way does thermal energy flow?

Accepted Answer

From you to the lake

Question 8

Which of the following equations represents the ideal gas law?

Accepted Answer

$$pV = nRT$$

Question 9

What is the pressure in Pascals of 3.13 moles of oxygen gas in a 6.00 L container at 150°C? (Use $$R = 8.31 	ext{ J/(mol K)})$$

Accepted Answer

$$1.83 	imes 10^5$ 	ext{ Pa}$$

Question 10

Which of the following statements about heat transfer is correct?

Accepted Answer

Heat always flows from a hotter object to a colder object.

Question 11

Which of the following is the correct formula for thermal conduction through a slab?

Accepted Answer

$$\frac{Q}{t} = \frac{kA \Delta T}{L}$$

Question 12

Which of the following best describes convection?

Accepted Answer

Heat transfer by the movement of a fluid.

Question 13

What is the value of the Boltzmann constant?

Accepted Answer

$$k_B = 1.38 	imes 10$$^{-23}$$ 	ext{ J/K}$$

Question 14

Which of the following is the correct relationship between the gas constant $$R$$ and Boltzmann's constant $$k_B$$?

Accepted Answer

$$R = N_A k_B$$

Question 15

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

Accepted Answer

Evaporation

Question 16

A metal pan with a wooden handle is used for cooking. Why is wood chosen for the handle?

Accepted Answer

Wood is a good insulator, preventing heat transfer to your hand.

Question 17

Which of the following equations represents the pressure of a gas in terms of the number of molecules?

Accepted Answer

$$pV = Nk_B T$$

Question 18

Which of the following statements about the Kelvin scale is correct?

Accepted Answer

The Kelvin scale starts at absolute zero, where atoms have minimal energy.

Question 19

Which of the following is the correct unit for pressure in the SI system?

Accepted Answer

Pascal ($$	ext{Pa})$$

Question 20

A gas sample contains $$0.10 kg of$$ $$O_2$$ molecules. Given the molecular mass of $$O_2 is$$ $$32 g/$$mol, how many moles of $$O_2$$ are present?

Accepted Answer

$$3.13$$ mol

Thermal Energy, Temperature, and Heat Transfer: Physics 2B PreLecture 12A Study Notes

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