Gases

Recall the postulates of kinetic-molecular theory. Which statement below applies to KMT?

• Gas particles behave like hard spheres

• Gas particles are attracted to each other

• Energy is lost when gas particles collide

• Gas particles occupy most of the space within a container

Tags

NGSS.HS-PS2-1

Recall the postulates of kinetic-molecular theory. Which statement below applies to KMT?

• Gas particles are attracted to each other

• Gas particles travel randomly

• Gas particles have mass and volume

• Gas particles occupy most of the space within a container

Tags

NGSS.HS-PS3-2

Recall the postulates of kinetic-molecular theory. Which statement below applies to KMT?

• Energy is lost when gas particles collide

• Gas particles occupy most of the space within a container

• Gas particles are attracted to each other

• Average kinetic energy of a collection of gas particles depends on the temperature

Tags

NGSS.HS-PS3-2

A sample of gas is enclosed in a container of fixed volume. Identify which of the following statements are true.

• If the container is heated, the gas particles will lose kinetic energy and temperature will increase.

• If the container is cooled, the gas particles will lose kinetic energy and temperature will decrease.

Tags

NGSS.HS-PS3-2

NGSS.HS-PS3-4

NGSS.HS-PS3-1

A sample of gas is enclosed in a container of fixed volume. Identify which of the following statements are true.

• If the gas particles move more quickly, they will collide more frequently with the walls of the container and pressure will increase.

• If the gas particles move more quickly, they will lose energy more rapidly and collide with the walls of the container less often, and pressure will decrease.

Tags

NGSS.HS-PS3-2

A sample of gas is enclosed in a container of fixed volume. Identify which of the following statements are true.

• If the gas particles move more quickly, they will collide with the walls of the container more often and with more force, and pressure will increase.

• If the container is heated, the gas particles will lose kinetic energy and temperature will increase.

Tags

NGSS.HS-PS3-4

A container with a specific volume “V” changes to “2V.” What happens to the average distance between gas molecules? Assume that pressure and temperature of the gas remain constant.

• Decrease

• Increase

• Expand indefinitely

• There is not enough information to tell

Which of these changes most likely results in an increase in the volume of a gas?

• Decreasing the pressure on the gas

• Cooling the gas

• Removing some of the gas from the sample

A sample of a gas is placed inside a cylinder that is a fixed size. The cylinder is heated as additional gas is added to it. What will most likely happen to the pressure of the gas inside the cylinder?

• It will decrerase

• It will increase

• It will not change

Tags

NGSS.HS-PS3-2

Identify the examples of diffusion in the list below. Check all that apply.

• A teacher takes the cap off a permanent marker. A few minutes later, students at the back of the classroom complain about the odor of the marker.

• A cooking school student burns a piece of toast. Soon, the entire kitchen smells like burnt toast.

• An inflated balloon shrinks when it is placed in a cold freezer.

• Toxic fumes produced by a chemical factory are detected in the air in a town several miles away.

• Heating a flexible container filled with gas causes it to expand.