Acids - Solutions that have a pH below 7.0, Alkalis - Solutions that have a pH above 7.0; also known as bases, Chemical change - change in the chemical composition of a substance by which new substances are formed, Chemical Compounds - Combinations of two or more atoms of different elements united chemically with fixed chemical composition, Chemical Properties - Characteristics that can only be determined with a chemical reaction, Chemistry - Science that deals with the composition, structure, and properties of matter, Compound Molecules - Two or more atoms of different elements united chemically with fixed chemical composition, Element - Simplest form of chemical matter and contains only one type of atom, Elemental Molecules - Molecules consisting of two or more atoms of the same element in fixed proportions, Emulsions - Mixtures of two or more immiscible substances united with the aid of a binder or emulsifier, Endothermic reaction - Chemical reaction that requires the absorption of energy or heat from external source, Exothermic Reaction - the release of energy in the form of heat through certain chemical reactions, Inorganic Chemistry - the study of substances that do not contain carbon by may contain hydrogen, Ion - An atom or molecule that carries an electrical charge, Matter - Anything that occupies space (volume) and has mass (weight), Molecule - Two or more atoms joined chemically, Organic Chemistry - The study of substances that contain carbon, Oxidation - Either the addition of oxygen or the loss of hydrogen; a chemical reaction that combines an element or compound with oxygen to produce an oxide, Oxides - Compounds of any element combined with oxygen, pH - Relative degree of acidity or alkalinity of a substance, Physical Mixture - Combination of two or more substance united physically, Pure substance - Matter that has a fixed chemical composition, definite proportions, and district properties, Redox - Oxidation-Reduction Reaction, Reduction - The subtraction of oxygen from, or the addition of hydrogen to a substance, Salts - Compounds that are formed by the reaction of acids and bases, Solute - Any substance that is dissolved into a solvent to from a solution, Solution - A stable, uniform mixture of two or more mixable substances made by dissolving a solid, liquid, or gaseous substance in another substance, Solvent - Any Substance, usually a liquid, that dissolves the solute to form a solution, Surfactant - Substance that acts as a bridge to allow oil and water to mix or emulsify by reducing surface tension, Suspensions - Formulations in which solid particles are distributed throughout a liquid medium,

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