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  1. 3. Who discovered a fundamental principle in chemistry stating that mass is neither created nor destroyed in a chemical reaction
  2. 4. A substance made up of only one type of atom
  3. 5. The substances that undergo chemical changes in a reaction. They are the starting materials and are transformed into products during the reaction.
  4. 7. Substances composed of two or more different elements chemically bonded together in fixed proportions. Compounds can be formed through chemical reactions between elements.
  5. 8. Numbers placed in front of chemical formulas in a balanced chemical equation to represent the relative amounts of reactants and products involved in the reaction.
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  1. 1. The process in which substances undergo chemical changes to form new substances with different properties. This involves the breaking of chemical bonds in the reactants and the formation of new bonds in the products.
  2. 2. The substances that are formed as a result of a chemical reaction. They are produced from the reactants and have different chemical properties than the reactants.
  3. 6. The basic building blocks of matter, consisting of a nucleus composed of protons and neutrons, with electrons orbiting around the nucleus.