Q: Which of the following is a correct conversion for standard atmospheric pressure?

$$1 \ \text{atm} = 101.3 \ \text{kPa}$$

Question 1

Which of the following is the best explanation for why atmospheric pressure decreases as altitude increases?

Accepted Answer

There are fewer air molecules above a given surface at higher altitudes, resulting in less weight and lower pressure.

Question 2

A pressure of 650.0 mm Hg is equivalent to how many atmospheres? (Use $$1 \ 	ext{atm} = 760 \ 	ext{mm Hg})$$

Accepted Answer

$$0.855 \ 	ext{atm}$$

Question 3

A 250 mL sample of gas is collected at $$57 ^\circ 	ext{C}. $$What volume will the gas sample occupy at $$27 ^\circ 	ext{C}$$, assuming constant pressure?

Accepted Answer

$$238 \ 	ext{mL}$$

Question 4

Which equation best represents the relationship between pressure, volume, and temperature for a fixed amount of gas?

Accepted Answer

$$PV = nRT$$

Question 5

A 1.0 L sample of gas at 430.0 kPa is compressed to 2.0 L. If the gas is compressed at 12.0 $$^\circC$$, what is the final pressure?

Accepted Answer

$$215 \ 	ext{kPa}$$

Question 6

Which of the following best describes the kinetic molecular theory as it applies to gases?

Accepted Answer

Gas particles are in constant, random motion and collisions between them are perfectly elastic.

Question 7

Which gas will effuse faster: $$O_2 or$$ $$CO_2$$? Explain why.

Accepted Answer

$$O_2$$, because it has a lower molar mass than $$CO_2.$$

Question 8

A cylinder of chlorine gas contains $$3.00 	imes 10$$^{24}$$ molecules. The amount of chlorine gas can be represented by which of the following?

Accepted Answer

$$5.00 \ 	ext{mol}$$

Question 9

Which of the following is NOT an assumption of the kinetic molecular theory for ideal gases?

Accepted Answer

Gas particles exert attractive forces on each other.

Question 10

If the temperature of a fixed amount of gas is doubled (in Kelvin), what happens to the average kinetic energy of the gas particles?

Accepted Answer

It doubles.

Question 11

A weather balloon is filled with helium at sea level and released. As it rises, what happens to the volume of the balloon, assuming temperature remains constant?

Accepted Answer

The volume increases.

Question 12

Which of the following best explains why scuba divers must ascend slowly to the surface?

Accepted Answer

To allow dissolved gases in the blood to come out of solution gradually and avoid decompression sickness.

Question 13

Which of the following is a correct conversion for standard atmospheric pressure?

Accepted Answer

$$1 \ 	ext{atm} = 101.3 \ 	ext{kPa}$$

Question 14

A sample of gas occupies $$500 \ 	ext{mL} at$$ $$25 ^\circ 	ext{C}$$ and $$1.00 \ 	ext{atm}. $$What volume will it occupy at $$50 ^\circ 	ext{C}$$ and $$2.00 \ 	ext{atm}$$?

Accepted Answer

$$263 \ 	ext{mL}$$

Question 15

Which of the following best describes the effect of temperature on the pressure of a fixed volume of gas?

Accepted Answer

As temperature increases, pressure increases.

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