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reversible - Able to be turned the other way around, element - Matter made of a single type of atom., compound - Matter made of two or more types of atoms., physical change - Making different without changing what the material is made of, such as by cutting, folding, or melting., chemical change - A change that alters the identity of a substance, resulting in a new substance or substances with different properties., decaying - Degrading or breaking down into smaller parts, state of matter - The distinct forms that different phases of matter take on, energy - What is needed to do work or cause change, mixture - A combination of two or more substances where each keeps its own properties and the substances can be easily separated, solution - A liquid mixture where one substance is mixed evenly throughout another substance, conserved - Preventing the loss of something, color change - Visible change in a substance's color, curdling - To separate into curds or lumps, physical property - A property that you can observe without changing the matter itself, chemical property - A property that you can observe only when the matter changes as a result of a chemical reaction, flammability - How easily a substance catches fire, matter - Anything that takes up space and has mass, mass - The amount of substance or particles in an object, precipitate - A solid substance that forms and separates from a solution., rust - A flaky, red substance that crumbles easily, tarnish - to dull the luster of (a metallic surface), especially by oxidation; discolor.,

Chemical and Physical Changes

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