Pass Check: Particles & Matter
Particle arrangement, movement and energy determine the state and properties of matter.
Density
Mass per unit volume of a substance, measured in kg/m³ or g/cm³.
Internal energy
The total kinetic and potential energy of all the particles in a system.
Specific latent heat
The energy needed to change the state of 1 kg of a substance with no change in temperature.
Pressure (gas)
The force per unit area exerted by gas particles colliding with the walls of a container.
Quick check
Mixed quiz
1. Explain why pressure increases when the volume of a fixed mass of gas is decreased at constant temperature.
2. A metal block of mass 3 kg and volume 400 cm3 is tested for density. Calculate the density in g/cm3.
3. State what internal energy of a system depends on.
4. State why a change of state is a physical change.
5. Calculate the specific latent heat of vaporisation of a liquid if 5,000 J melts 0.02 kg of it into vapour.
6. How is the volume of an irregularly shaped solid usually measured?
7. Explain why the temperature of a beaker of boiling water stays at 100C even though a Bunsen burner keeps supplying heat.
8. Explain why increasing the temperature of a gas increases its pressure at constant volume.