three states of matter - solid, liquid, gas, particles - extremely small units of matter, physical change - change of matter from one form to another without a change in chemical properties, dissolve - melt, make a solution out of, or turn into a liquid, properties - characteristics used to describe a substance, chemical reaction - process in which substances are changed into others, solution - a mixture that forms when one substance dissolves another, conserve - to save, substance - material with particular physical characteristics, matter - Anything that has mass and takes up space,

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