Gas Laws Quest

A sample of helium gas occupies 2.65 L at 1.20 atm. What pressure would this sample of gas exert in a 1.50 L container at a constant temperature?

This is Open-Ended Question A. Show your work on the answer sheet in the appropriate box on the paper, then type the answer in the box here. Do not include anything other than numbers and decimal points in this box.

A 1.00 L sample of argon gas is currently at 11°C. At what temperature (in Celsius) would the volume expand to 3.00 L, assuming constant pressure?

This is Open-Ended Question B. Show your work on the answer sheet in the appropriate box on the paper, then type the answer in the box here. Do not include anything other than numbers and decimal points in this box.

A sample of oxygen gas (O₂) has a volume of 7.51 L at a temperature of 19.0°C and a pressure of 1.38 atm. Calculate the number of moles of O₂ present in this gas sample. (Answer to 3 decimal places)

This is Open-Ended Question C. Show your work on the answer sheet in the appropriate box on the paper, then type the answer in the box here. Do not include anything other than numbers and decimal points in this box.

This student attempted to solve a problem using gas laws. What was the error that the student made in their calculations?

• The student used the incorrect value for n.

• The student used the wrong gas law.

• The student used the incorrect value for V.

• The student used the incorrect value for T.

An inflated balloon is placed in a freezer for one hour. What will happen to the volume of the balloon after it is taken out of the freezer and warms up?

• The volume will increase

• The volume will decrease

• The volume will not be affected

A gas sample has a volume of 2.00 L at a temperature of 203 K. If the temperature is increased to 406 K, what will be the new volume of the gas if pressure remains constant?

• 4.00 L

• 3.00 L

• 2.50 L

• 1.00 L

What gas law is demonstrated by the balloon in this image?

• Avogadro's Law

• Boyle's Law

• Charles's Law

• Gay-Lussac's Law

• Ideal Gas Law

Putting a dented ping-pong ball in hot water can get rid of the dents. Which gas law is applied here?

• Avogadro's Law

• Boyle's Law

• Charles's Law

• Gay-Lussac's Law

• Ideal Gas Law

When using the ideal gas law, the temperature must be in Kelvin because...

(Choose all the answers that apply)

• ...otherwise you could calculate a negative volume.

• ...you need to use an absolute temperature scale with 0 at the bottom.

• ...Kelvin is the best choice for doing calculations with temperature.

If temperature and pressure are held constant, the volume and number of moles of gas are:

• Inversely Proportional

• Directly Proportional

• Independent of Each Other

• Equal