change of state - When energy is added, particles speed up and move further apart., Matter - Any substance that takes up space and has mass, particle model - explains the different properties of states of matter and why changes of state occur., sublimation - A change of state from solid to gas, chemical bond - An attractive force that holds two atoms together, Chemical Change - A change in matter that forms one or more new substances, Dissolving - A physical change where a solid spreads through a liquid, Mixing - Where 2 or more substances are combined, physical change - A change in matter that does not form new substances, Compound - A substance made up of two or more types of atom bonded together, Element - A substance made up of only one type of atom, Molecule - A group of atoms bonded together,

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