mixture, two or more substances that are together in the same place but their atoms are not chemically bonded, colloid, A mixture containing small, undissolved particles that do not settle out, suspension, A mixture in which particles can be seen and easily separated by settling or filtration, solution, A mixture containing a solvent and at least one solute that has the same properties throughout; a mixture in which one substance is dissolved in another, solvent, The part of a solution that is usually present in the largest amount and dissolves a solute, solute, The part of a solution that is dissolved by a solvent, solubility, A measure of how much solute can dissolve in a given solvent at a given temperature, dissolve, When one substance completely disappears into another substance to form a solution, physical change, A change that alters the form or appearance of a material but does not make the material into another substance, chemical change, A change in which one or more substances combine or break apart to form new substances, reactant, A substance that enters into a chemical reaction, product, A substance formed as a result of a chemical reaction, exothermic reaction, A reaction that releases energy, usually in the form of heat, endothermic reaction, A reaction that absorbs energy, rate, How slowly or quickly something happens, law of conservation of mass, The principle that the total amount of matter remains the same, regardless of any chemical or physical change, open system, A system in which matter can enter form or escape to its surroundings, closed system, A system in which no matter is allowed to enter or leave, decomposition, The act of a compound breaking down into simpler products

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