A hot-air balloon rises. Which is the best explanation for this observation?

• The rate of diffusion of cooler air is less than that of warmer air.

• The cooler air outside the balloon pushes on the walls of the balloon.

• The pressure on the walls of the balloon increases with increasing temperature.

• The different in temperature between the air inside and outside the balloon produces convection currents.

At 127^OC, a certain gas occupies a volume of 40.0 mL. Assuming that pressure and number of particles were held constant, what volume will it occupy at -73^OC?

• 182.0 mL

• 88 ml

• 80 ml

• 20 ml

A sample of hydrogen occupies 600 L at 327 ^OC. if the pressure is held constant, what volume will the gas occupy being cooled to 27 ^OC?

• 200 L

• 244 L

• 300 L

• 522 L

Referring to a sample of hydrogen occupies 600 L at 327 ^OC. if the pressure is held constant, what volume will the gas occupy being cooled to 27 ^OC, what could happen to the temperature if the volume is decreased? It will ______.

• Eventually decrease

• Rapidly increase

• Remain the same

• Not affect the system

Sarah bough a set of balloons at around 10:00 o’ clock in the morning to decorate their garden for the party. As time went by, she noticed that the balloons were expanding and worst, others exploded. What could be the best explanation to Sarah’s observation? As the temperature increases ___________ .

• More space are being occupied by the gas

• it makes the balloons hot causing them explosion

• the volume of gas molecules inside the balloon increases

• gas molecules move slowly and thus there is less collision thereby occupying smaller space

When there is an increases in gas (1) _______ ? CHARLE' S LAW

• Expansion

• Temperature

• Matter

• Faster

It is because gas particles are moving _________ and collisions will be more forceful.

• Faster

• Expansion

• Temperature

• Volume

However, if the container of the gas is flexible enough to allow ________?

• Expansion

• Faster

• Matter

• Volume

. The net change caused by the increase in temperature is an increase in ________?

• Volume

• Matter

• Pressure

• Slower

The immediate effect is an increase in_______?

• Pressure

• Volume

• Matter

• Temperature