Chemistry Midterm 1-2

The pressure exerted by a gas in a container depends on

• the space between the molecules

• the instrument used to measure the pressure

• the number of collisions between gas molecules and other gas molecules

• the number of collisions between gas molecules and the walls of the container

As atmospheric pressure decreases, the column of mercury in a barometer:

• increases in height

• decreases in height

• remains at the same height

• increases or decreases, depending on the temperature

Which graph represents the relationship between the pressure of a gas and the absolute temperature?

• Graph A

• Graph B

• Graph C

• Graph D

The diagram below shows a representation of a sample of gas at 25°C. Which of the following best represents the same gas at 0°C?

• Box A

• Box B

• Box C

• Box D

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What happens to the molecules in a thermometer when it is placed in warm water?

• They slow down and move closer together.

• They move faster and move farther apart.

• They stop moving.

• They move at the same speed.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following best describes the motion of gas particles at higher temperatures?

• They move slower and closer together.

• They move faster and farther apart.

• They stop moving.

• They move in a fixed pattern.

Tags

NGSS.HS-PS2-1

What happens to the pressure of a gas if the volume is kept constant and the temperature is increased?

• Pressure decreases.

• Pressure remains constant.

• Pressure increases.

• Pressure fluctuates.

A container of carbon dioxide has a volume of 240 cm³ at a temperature of 22°C. If the pressure remains constant, what is the volume at 44°C?

• 258 cm³

• 240 cm³

• 300 cm³

• 200 cm³

The pressure of a 250 mL sample of gas is 105 kPa. What would be the pressure if the volume were increased to 375 mL?

• 70.0 kPa

• 105 kPa

• 90.0 kPa

• 120 kPa

What is the initial pressure of the gas in problem 15?

• 998 mmHg

• 760 mmHg

• 105 kPa

• 26 psi