Chemical Reactions Quiz Four signs that a chemical reaction has occurred…fill in the blank. 1. There’s a change in ____________________________________. 2. There’s a change in _______________________________. 3. You see ____________________________. 4. A ____________________________ starts to form from the liquid. Matching – Chemical reaction Vocabulary words. Endothermic A single reactant breaks into two or more products Exothermic Two or more reactants combine to make a single product Synthesis A reaction that takes energy IN (gets colder) Decomposition A reaction that burns a fuel Replacement A reaction that puts energy OUT (gets warmer) Combustion A reaction in which the reactants break apart and switch places to make new product