Solids - Have a fixed shape and volume, they cannot flow or be compressed., Liquids - Can be poured and take the shape of the container, they cannot be compressed., Gases - Have no fixed shape, fill any container and are easy to compress., Expansion - The particles vibrate, the space between the particles increases., Contraction - The particles vibrate less, the space between the particles decrease., Diffusion - The movement of particles from an area where they are in high concentration to an area of low concentration until they are evenly spread., Physical changes - No new substances are made, and the change is often easily reversed., Chemical changes - New substances are made, and the change is often not easily reversed., Melting point - The temperature at which a solid turns to a liquid., Boiling point - The temperature at which a liquid turns to a gas., Sublimation - A substance changes straight from a solid into a gas., Conservation of Mass - In a chemical reaction the total mass of the products will be the same as the total mass of the reactants.,

Particle Theory

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