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Chemical Change One or more substances are changed to form a new substance. Dissolve The disappearance of one substance into another when they are mixed. Gas matter that has no definite shape Heat a form of energy that is transferred by a difference in temperature, a form of energy that is transferred by a difference in temperature Liquid a substance in the fluid state of matter having no fixed shape but a fixed volume Matter that which has mass and occupies space Substance matter that has the same fixed composition and properties Physical Change a change from one state (solid or liquid or gas) to another without a change in chemical composition Product a chemical substance formed as a result of a chemical reaction Reactants the elements or compounds that enter into a chemical reaction Solid state of matter whose molecules vibrate in place, with little space in between, arranged in a regular pattern weight the force of gravity on an object