Particle model of matter

• What are the 3 states of matter? [3] - Solids - Liquids - Gas
• Why are solids and liquids incompressible? Because there are no gaps between the particles in them.
• What is the arrangement like for solids? [2] - Fixed arrangement - Fixed size and shape
• What is the arrangement like for liquids? [2] - Fixed size but contain particles that are free to move - Allows them to change shape to fit their container
• What is the arrangement like for gases? [3] - Large gaps between particles - Makes them compressible - Enables them to change size and shape
• What is the equation for density?
• What will happen to the temperature as energy is added to a system? Increase
• What will happen to the temperature and state of a substance, as energy is being added at the melting or boiling state? - Causes the substance to change state temperature.
• Is a change of state reversible? Yes.
• What is the equation for specific latent heat? Energy for a change of state = mass * specific latent heat
• What is specific latent heat? The energy needed to cause 1kg of a substace to change state.
• What is latent heat of fusion. The energy needed for a substance to change from solid to liquid
• What is latent heat of vaporisation? Is the energy needed for a substance to change from liquid to gas.
• What is sublimation? Substances that change from a solid to a gas without having a liquid phase in the middle.
• What happens when the particles of a gas collide with the waalls of their container? They exert a force on the wall, which is felt as pressure.