How can most physical changes be understood?

What is the particle model?

What does the particle model assume?

How are the particles in solids?

How are the particles in liquids?

How are the particles in gases?

How can the physical changes of expansion and contraction be understood?

As the temperature increases what else happens?

What happens if the vibration increases?

What happens when a solid is cooled?

What is the difference between the particles in solids and liquids?

What happens when the temperature of a gas is increased?

What happens if the particles travel faster?

What happens if a gas is cooled?

How does the particle model explain changes of state?

What is freezing?

When does evaporation occur?

What is condensation?

When are mixtures formed?

What is diffusion?