Atom - -the building blocks of matter, Boiling - the process of adding heat to a liquid so that it evaporates and becomes a gas, Condensation - - the process of changing a gas to a liquid by removing heat., Evaporation - the process of changing a liquid to a gas by adding heat., Freezing - - the process of changing a liquid to a solid by removing heat., Gas - a substance whose particles are in motion and widely spread out. It has no volume or shape., Heat - the transfer of thermal energy between objects at different temperatures, Kinetic energy - the energy of particles in motion, Liquid - a substance that flows freely and has a constant volume. It takes the shape of its container., Matter - anything that has mass and takes up space, Melting - the process of changing a solid to a liquid by adding heat., Molecule - a group of atoms bonded together, Phase - The parts of a system, like matter,are physically separate and distinct from the other parts of that system, Phase change - when matter changes from one state to another (solid- liquid), Pure substance - a single kind of matter that cannot be changed into another substance by any physical means. Examples include water, gold and salt, Solid - - a substance that has molecules that are firmly packed together and keeps its shape without a container., Temperature - - a measure of the average kinetic energy of particles of matter in a substance, thermal energy - the energy within a substance that comes from moving particles and generates heat., Vibration - - the repeated back and forth motion of a particle.,

Solid, Liquid and Gas

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