Gas Behavior

As we stand and watch the hot air balloon rise in the sky, we can imagine what is happening at the microscopic level to the gas molecules inside the balloon. As the balloon rises, the gas molecules are

• moving faster and spreading apart.

• slowing down and moving closer together.

• gradually escaping from the confines of the balloon.

• all collecting at the top of the balloon, pushing upward.

Tags

NGSS.MS-PS1-4

Jenavius placed a marshmallow in the microwave to make a smore for desert. The marshmallow expanded when it was heated. How can you best describe why this happened?

• As the marshmallow was heated the particles moved faster increasing its volume.

• As the marshmallow was heated the particles moved faster decreasing its volume.

• As the marshmallow was heated the particles moved slower increasing its volume.

• As the marshmallow was heated the particles moved slower decreasing its volume.

Tags

NGSS.MS-PS1-4

What is going to happen to the volume of a gas that is put under MORE pressure while keeping the temperature constant?

• The volume will increase.

• The volume will decrease.

• The volume will fluctuate.

• The volume will remain constant.

Jessica took a mylar balloon outside on a very hot day. As she waited for the bus the balloon began to get bigger. What is the best explanation of this?

• As the particles became warmer, they lost energy and moved more, resulting in less pressure on the balloon.

• As the particles became warmer, they gained energy and moved more, resulting in less pressure on the balloon.

• As the particles became warmer, they lost energy and moved more, resulting in more pressure on the balloon.

• As the particles became warmer, they gained energy and moved more, resulting in more pressure on the balloon.

Tags

NGSS.MS-PS1-4

A DECREASE in the density of a sample of a gas inside a balloon could be caused by

• putting the balloon in the refrigerator.

• taking the balloon outside on a hot day.

• shaping the balloon into the shape of a dog.

• taking the balloon down to the bottom of the ocean.

Tags

NGSS.MS-PS1-4

A ping pong ball with a dent in it can be put into a pan of boiling water. After a short amount of time, the dent will pop out. Determine the best reason for this occurrence.

• The ping pong ball plastic heats up and expands.

• The number of gas particles inside the ping pong ball increases causing more pressure.

• The gas particles inside speed up due to heat and cause an increase in pressure within the ball.

• Gas particles inside collide with each other less and with the ball more causing the dent to pop out.

Tags

NGSS.MS-PS1-4

A person opens a 2-liter bottle of cola at a picnic. If the cap is left off the bottle, the cola will become 'flat' or lose it's carbonation. Which statement below BEST summarizes why the cap must be kept tightly in place if the cola is to remain fresh?

• The cap prevents the liquid in the cola from evaporating.

• The cap keeps the atmospheric gases and liquid from mixing in the bottle.

• The cap keeps warm air from entering the two-liter bottle and raising the temperature of the cola solution.

• The cap keeps the pressure of the gas in the bottle at a high level preventing carbon dioxide from leaving the solution.

Jessica took a mylar balloon outside on a very cold day. As she waited for the bus the balloon began to shrink. What is the best explanation of this?

• As the particles became cooler, they lost energy and moved less, resulting in less pressure on the balloon.

• As the particles became cooler, they gained energy and moved less, resulting in less pressure on the balloon.

• As the particles became cooler, they lost energy and moved less, resulting in more pressure on the balloon.

• As the particles became cooler, they gained energy and moved less, resulting in more pressure on the balloon.

Tags

NGSS.MS-PS1-4

Relate the pressure of a gas to its concentration of particles.

• Pressure will expand a gas, enlarging its volume and reducing its density and concentration of particles.

• Pressure will magnify a gas, developing its volume and multiplying its density and concentration of particles.

• Pressure will compress a gas, reducing its volume and giving it a greater density and concentration of particles.

• Pressure will accelerate a gas, extending its volume and allowing a smaller density and concentration of particles.

When car tires are on hot pavement for too long, the pressure inside will ___________ and the volume within the tire will _____________.

• increase; decrease due to deflation

• decrease; remain unchanged

• increase; increase and possibly result in a blowout

• increase; remain unchanged as long as the temperature is constantly rising

Tags

NGSS.MS-PS1-4