. decomposition reaction the reaction of an acid with a base to form a salt and water 2. double displacement reaction a chemical reaction in which one substance breaks up into two or more new substances 3. neutralization reaction two ionic compounds reacting in solution to form two new compounds, one of which is insoluble 4. salt chemical compound formed when the negative ions from an acid combine with the positive ions of a base 5. single replacement reaction a reaction in which an active metal displaces a less active metal or hydrogen from a compound solution (or a nonmetal replaces a nonmetal from a compound in solution) 6. synthesis reaction a reaction in which two or more substances combine to form a new substance
