Chemical Equations Instructions: Write the word equations for the chemical equations below and determine the type of reaction (synthesis/combination, decomposition, single-displacemet, double-displacement, or combustion). 1. 2 -0 2 , + 2 2 Water molecules decompose to equal four hydrogen atoms and two oxygen atoms; decomposition reaction. 2. CHAG) + 2 02 CO2) + 2 H,0 ->