Question 1

Which of the following best describes the function of a barometer in measuring atmospheric pressure?

Accepted Answer

It uses a column of mercury to measure the force exerted by the atmosphere.

Question 2

A manometer is used to measure the pressure of a gas sample in the laboratory. If the mercury level is higher on the side open to the atmosphere, which statement is true about the gas pressure?

Accepted Answer

The gas pressure is less than atmospheric pressure.

Question 3

Which equation correctly represents Boyle's Law?

Accepted Answer

$$P_1V_1 = P_2V_2$$

Question 4

A syringe contains 16 mL of air at 1.0 atm. If the pressure increases to 8.0 atm, what is the new volume of air in the syringe? (Assume temperature is constant.)

Accepted Answer

$$2.0\ 	ext{mL}$$

Question 5

Which unit is commonly used to express pressure in laboratory settings and is based on the height of a mercury column?

Accepted Answer

mmHg

Question 6

At standard temperature and pressure (STP), what is the molar volume of an ideal gas?

Accepted Answer

$$22.4\ 	ext{L}$$

Question 7

If a woman’s lung volume increases from $$2.75\ 	ext{L} to$$ $$3.25\ 	ext{L} at $$constant temperature, and the initial pressure is $$1.02\ 	ext{atm}$$, what is the final pressure in her lungs?

Accepted Answer

$$0.863\ 	ext{atm}$$

Question 8

Which of the following statements about the relationship between pressure and volume for a gas at constant temperature is correct?

Accepted Answer

Pressure and volume are inversely proportional.

Question 9

A gas sample exerts a pressure of $$760\ 	ext{mmHg} in a $$closed container. What is this pressure in atmospheres?

Accepted Answer

$$1.00\ 	ext{atm}$$

Question 10

Which of the following best explains why a gas exerts pressure on the walls of its container?

Accepted Answer

Gas molecules collide with the container walls, transferring force per unit area.

Question 11

A manometer contains mercury and is connected to a gas sample. If the difference in mercury height is $$120\ 	ext{mm}$$ and the atmospheric pressure is $$760\ 	ext{mmHg}$$, what is the pressure of the gas if the mercury is higher on the open side?

Accepted Answer

$$640\ 	ext{mmHg}$$

Question 12

Which law describes the relationship between the volume and temperature of a gas at constant pressure?

Accepted Answer

Charles's Law

Question 13

If the pressure of a gas is doubled at constant temperature, what happens to its volume?

Accepted Answer

It halves.

Question 14

Which of the following is NOT a unit of pressure?

Accepted Answer

K

Question 15

A gas sample at $$273\ 	ext{K}$$ and $$1.00\ 	ext{atm}$$ occupies $$22.4\ 	ext{L}. $$How many moles of gas are present?

Accepted Answer

$$1.00\ 	ext{mol}$$

Question 16

Which equation is used to convert pressure from mmHg to atm?

Accepted Answer

$$P_{atm} = \frac{P_{mmHg}}{760}$$

Question 17

A gas sample has a pressure of $$2.5\ 	ext{atm}$$ and a volume of $$4.0\ 	ext{L}. If $$the pressure is reduced to $$1.0\ 	ext{atm} at $$constant temperature, what is the new volume?

Accepted Answer

$$10.0\ 	ext{L}$$

Gases: Pressure, Measurement, and Gas Laws

Guida di studio - Domande di pratica

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