a change from one state of matter (solid, liquid, gas) to another without a change in chemical composition

the number placed in front of a chemical formula to indicates the number of molecules present

interaction between molecules that causes a chemical change, converting an existing substance into a new substance

a symbol, usually a letter or a number, placed immediately below and to the right of a written character

a reaction in which one atom or ion in a compound is replaced by another atom or ion

a substance that has a pH below 7; will increase the concentration of hydrogen ions in solution

an ionic substance (H3O+) formed when a water molecule combines with a hydrogen ion

the substances present before a chemical reaction occurs; in a chemical reaction the arrow usually points away from the reactant(s)

a chemical reaction between two compounds where the cations in two compounds switch the anions they are bonded to, resulting in two new compounds

a reaction in which two or more elements or compounds combine to form a more complex compound

a reaction in which a substance reacts with oxygen gas to produce carbon dioxide, water, and heat

the substances that are formed during a chemical reaction; in a chemical reaction the arrows point toward the product