# Worksheet: Charles' Law

In this worksheet, we will practice how to use the formula V/T = constant (Charles' Law) to calculate the volume or temperature of a gas that is heated or cooled at a constant pressure.

Q1:

On a hot day, a party balloon is filled with helium. The following day is much colder, but the air pressure is the same. Assuming that no helium escapes from the balloon in that time, will the balloon have a larger volume than, a smaller volume than, or the same volume as that it had on the previous day?

• AA smaller volume
• BA larger volume
• CThe same volume

Q2:

The temperature of 4 m3 of gas is initially 320 K. The gas is heated while being kept at constant pressure. This causes the gas to expand. The gas is heated until it has a volume of 10 m3. What is the temperature of the gas after it is heated?

Q3:

Which of the following formulas correctly relates the volume and temperature of a gas that is kept at a constant pressure? represents the volume of the gas and represents the temperature.

• A
• B
• C
• D
• E

Q4:

A hot gas that initially has a volume of 20 m3 is allowed to cool under constant pressure. When the gas reaches a temperature of 320 K, it has a volume of 16 m3. What is the initial temperature of the gas?

Q5:

A gas is cooled while being kept at a constant pressure. If its temperature in kelvin changes by a factor of 0.25, by what factor does the volume of the gas change?

Q6:

A gas initially has a volume of 0.5 m3 and is at a temperature of . The gas is heated at constant pressure until its temperature is . What is the volume of the gas after it is heated? Give your answer to 3 significant figures.

Q7:

The temperature of 14 m3 of gas is initially 350 K. It is heated to 450 K while being kept at a constant pressure. What is the volume of the gas after it is heated?

Q8:

Which of the lines on the graph shows how the volume of a gas varies with its temperature when it is kept at constant pressure? • AThe blue line
• BThe red line
• CThe green line
• DThe purple line
• EThe black line

Q9:

A gas is heated while being kept at a constant pressure. If its temperature in kelvin increases by a factor of 2, by what factor will the volume of the gas change?