Introduction to Gases

Gas pressure is caused by

• gas molecules colliding with surfaces
• gas molecules condensing to a liquid
• gas molecules hitting other gas molecule
• barometers

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The state of matter having no definite shape or volume.

• solid
• liquid
• gas

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According to the kinetic theory of gases, gas particles

• Do not always move in straight lines

• Have most their volume occupied by empty space

• Attract each other

• Do not always move randomly

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Gas pressure is caused by

• Molecules colliding with each other

• Molecules condensing to a liquid

• Molecules colliding with the walls of containers

• Barometers

When a balloon filled with air is placed in the freezer, the balloon will

• Expand

• Shrink

• Stay the same size but decrease in temperature

• Stay the same size and temperature

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Which statement about the molecules in the gas carbon dioxide is correct?

• The molecules are close together.

• The molecules are diatomic.

• The molecules move randomly.

• The molecules all move with the same speed.

Which of the following statements about the particle of a gas is true?

• Gases can be compressed because their particles are smaller than those of liquids or solids.
• Gases can be compressed because there is plenty of space between their particles.
• Gases can be compressed because they have low boiling points.
• Gases can be compressed because their particles are more elastic than those of liquids or solids.

An inflated balloon is placed in a refrigerator. Which statement describes the movement of the gas particles in the balloon?

• The particles move more slowly and become closer together.
• The particles move more slowly and become further apart.
• The particles move faster and become closer together.
• The particles move faster and become further apart. 

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Which of the following statements about the particle of a gas is true?

• The particles of a gas vibrate about fixed positions.
• The particles of a gas are packed close together in a disorderly arrangement.
• The particles of a gas are far apart and move in all directions.
• The particles of a gas are stationary in an orderly arrangement.

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What is the instrument that measures air pressure called?

• Graduated cylinder
• Barometer
• Force scale
• Anemometer