physical change - a change in state of matter where no new substance is formed., products - the result of substances being combined in a chemical reaction., atoms - smallest piece of an element, molecule - formed when two or more atoms are joined chemically, chemical change - chemicals combining to cause new substances to be formed, reactant - substances that are combined to form products in a chemical reaction., properties - characteristics of matter that can be used to identify substances., catalyst - a chemical that makes a chemical reaction happen faster., chemical engineer - a scientist who uses chemical reactions to solve problems., material scientist - scientist who uses chemical reactions to make new materials., chemical process - process in which one or more substances, also called reactants, are converted to one or more different substances, known as products.,

Chemical Reactions Vocabulary

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