Gas Properties Quiz

Gas particles will __________

to occupy the available space in the container.

• expand

• contract

The large amount of space between gas particles also means that the volume of the gas can be made to decrease if the pressure on the gas is

__________.

• decreased

• increase

Decreasing the pressure of a gas will lead to ___________ collisions between the particles.

• fewer

• greater

Decreasing the gas volume by pressing the gas particles closer together is a way to measure the gas's __________.

• kinetic energy

• compressibility

A scientist is conducting a series of tests on air samples taken from different locations on the same day. The air samples all contain the same 2 L volume of air with a notation of the place, temperature, and pressure conditions under which it was taken.
How would the density of two of the air samples likely differ if one was taken from the top of the Rocky Mountains and the other from the bottom?

• The air sample from the mountaintop would be less dense. There would be more air particles collected in the 2 L volume, making the air less dense.

• Both air samples would have similar densities given that the same 2 L volume of the samples were taken. Density is the same at any pressure if the volume is the same.

• The air sample from the mountaintop would be less dense. The lower pressure at the mountaintop means that the particles would be further apart, therefore fewer air particles would be collected.

• The air sample from the mountaintop would be more dense. The lower temperature at the top of the mountain means that the air particles would be closer together, therefore more air particles would be collected.

A sample of oxygen gas with a volume of 2 L is compressed to a volume of 1 L.

Based on the kinetic theory of gases, how will the number of collisions and the pressure change when the volume of the gas is decreased?

• The number of collisions and the pressure both decrease

• The number of collisions decreases and the pressure increases

• The number of collisions and the pressure both increase

• The number of collisions increases and the pressure decreases

On a cold winter day, Serena buys some helium-filled balloons from a supermarket for a friend's birthday party. The supermarket is heated, and the temperature is warm inside. After taking them outside, they seem to have deflated. Yet, when the balloons are in a heated car, they return to their original size.

Explain what is happening with the balloons in terms of temperature, particle movement, and volume.

As a material is heated, it's particles....

• get smaller
• slow down
• get cooler
• move more quickly

As temperature rises ___________.

• an atom's kinetic energy decreases

• an atom's kinetic energy increases

• an atom's kinetic energy stays the same