Gas laws

State the equation linking force, pressure and area

• force = pressure/area

• pressure = force x area

• pressure = force / area

• area = pressure x force

Explain why gases exert a pressure - select all answers which apply.

• particles collide with other particles and exert a force

• particles collide with the walls of the container and exert a force

• particles exist

• particles move freely

• force over an area exerts a pressure

Boyle's law is best stated as:

• pressure is proportional to volume

• pressure is directly proportional to volume

• pressure and volume are the same

• pressure is inversely proportional to volume

For Boyle's law, which two physical quantities must be kept constant?

• mass of gas and temperature

• temperature and volume

• volume and mass

• pressure and volume

What are acceptable units of pressure? Select all answers which apply.

• newtons, N

• newton-metre² (Nm²)

• pascal (Pa)

• newton per metre² (N/m²)

What is the relationship between pressure and absolute temperature?

• pressure is directly proportional to temperature (in celsius)

• pressure is inversely proportional to temperature (in kelvin)

• pressure is proportional to temperature (in kelvin)

• pressure is directly proportional to temperature (in kelvin)

Zero kelvin (0K) is the

• lowest possible (theoretical) temperature

• same as 0F

• same as 273^oC

• quite hot, really.

To work out absolute zero from a celsius pressure-temperature graph you should...

• calculate the gradient

• find the x intercept by extrapolating the line of best fit

• cross your fingers and hope for the best

• find the y intercept

Select the examples of Brownian motion - select all answers which apply.

• Pollen grains on water

• Donald Trump's hair flapping as he gets off a helicopter

• A crisp wrapper in the breeze

• Smoke particles in air

A gas has a volume of 10cm³ and is at a pressure of 100kPa. The volume is doubled to 20cm³, what is its new pressure?

• 100kPa

• 50kPa

• 200kPa

• 10kPa