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Penicillin A medicine that is used to kill bacterial infections, discovered by Alexander Fleming. Acids A chemical property that has a strong sour taste and turns litmus paper red; vinegar is an example. Bases A chemical property that turns litmus paper purple; soap is an example. Harmful A substance that is not good for you; can hurt you Properties A synonym for features or characteristics or substances. Corrosive When a substance (metal) wears away by chemicals. Polymer A large molecule made of many identical units connected together, such as nylon. Mold Fungus growth that appears on the surface of food from which penicillin is made. Results Another term for the answer in #12. Waste product A substance made from the chemical reaction that is left over and not used. Flammable A substance that produces a flame. Combustibility The ability of a substance to burn. Toxic A substance that is poisonous. Conserved Matter is always saved because it cannot be created or destroyed. Bonds During some chemical changes bonds between atoms or molecules break. Crystals Salts form regular geometric patterns. Rust A chemical reaction when iron and oxygen combine. Solution A substance that dissolves in another substance and is spread evenly throughout. Ores Rocks that include metals combined with other substances. Chemical equation A special kind of scientific sentence that shows a chemical reaction. Physical change is when the substances keep their properties. Reactants Substances used in chemical reactions (on the left side of the equation). Product Substances made from the chemical reaction (on the right side of the equation. Chemical change is when substances combine to form new substances and gain new properties. Decomposition A type of chemical reaction in which compounds split apart to form smaller compounds or elements. Combination A type of chemical reaction in which compounds form new compounds.