Gas Laws Lesson Middle School

A student inflates a balloon with helium then places it in the freezer. The student should expect

• the balloon's volume to increase

• the balloon's volume to decrease

• the balloon's moles to increase

• the balloon's moles to decrease

Tags

NGSS.HS-PS3-4

Three gases are mixed together in a container with a total pressure of 4.8 atm. If two of the gases have pressures of 1.2 atm and 1.5 atm, what is the pressure of the third gas?

• 2.5 atm

• 1.8 atm

• 2.1 atm

• 1.3 atm

If a hairspray can is heated, what can be expected of the pressure of the gas inside the can?

• The pressure will increase

• The pressure will decrease

• The pressure will remain constant

• The pressure will equalize

Which of the following would increase the (gas) pressure of a system?

• Increase the Temperature
• Pump in more gas
• Decrease the volume
• All of these

In order to convert to Kelvin, you add ______ to the Celsius measurement.

• 372
• 273
• 237
• 732

What is 50 °C in Kelvin?

• 223
• 323
• 100
• 50

Calculate the volume that a 0.323-mol sample of a gas will occupy at 265 K and a pressure of 0.900 atm.

• 7.18 L 
• 7.81 L
• 4.63 L
• 4.36 L

Find the volume occupied by 22.0 g of helium gas at 25.0 ^o C and 1.18 atm .

• 123 L

• 9.57 L

• 114 L

• 159 L

Unit inter-conversions allow different scales for measuring temperature, pressure or volume to be compared.

Which sets of pressures are equivalent ?

• 1.6 kPa, 1260 torr, 1.42 atm

• 6.9 kPa, 912 torr, 1.50 atm

• 1.6 kPa, 912 torr, 1.20 atm

• 0 kPa, 1000 torr, 1.40 atm

A real gas does not exhibit ideal gas behaviour because

• there are significant attractions between molecules so that the volume of the gas is reduced

• the size of the particles are inconsequential and so their volume can be ignored in calculations

• the collisions between the gas particles are perfectly elastic and so no energy is gained or lost

• only noble gases are ideal gases and all other gases are called real gases