Particle Physics

What is the name given to the total kinetic energy and potential energy of all the particles of helium gas in a balloon?

• External energy
• Internal energy
• Movement energy

What is the unit for density?

• kilograms per meter squared
• kilograms sqared meters squared
• kilograms per meter cubed

What is the equation that links density, mass and volume?

• density = mass / volume
• density = volume/ mass
• density = volume x mass

Which state of matter has the highest density?

• solid
• liquid
• gas

Why do the particles in a substance in its gaseous state have more energy than when it is a solid or a liquid?

• There are a lot of particles
• The particles are bigger
• The particles are moving quicker

Why does heating a gas increase the average speed of the gas particles?

• The particles get bigger
• You get more particles when you heat something
• You increase the average kinetic energy of the particles in the gas

Why does the pressure of a gas in a container with a fixed volume increase as you increase its temperature?

• The particles get bigger
• The particles move quicker, which makes them hit the sides of the container more often
• Increasing the temperature increases the number of particles

What is the equation that links energy, mass and latent heat of fusion?

• energy = mass / latent heat of fustion
• energy = latent heat of fusion / mass
• energy = mass x latent heat of fusion

Calculate the energy transferred to the surroundings as 0.40kg of stearic acid changed state from liquid to solid. The latent heat of fusion of stearic acid is 199,000J/kg.

• 35000J
• 796000J
• 79600J

The helium in a balloon has a mass of 0.00254kg. The balloon has a volume 0.0141 meters cubed. Calculate the density of the helium.

• 0.18 kg/ m squared
• 0.18 kg/ m cubed
• 0.18 kg m cubed