Chemical Equations and Reactions

Describing Chemical Reactions

Example: (NH4)2Cr2O7 → N2(g) + Cr203(s) + 4H2O(g)

Four Indications of a Chemical Reaction

3 Characteristics of Chemical Equations

A word equation is when the products are described using words instead of chemical formulas.
Example of formula equation: CH4 + O2 → CO2 + H2 0.
Example of word equation: methane+ oxygen → carbon dioxide + water

There are five types of chemical equations: Synthesis Reactions, Decomposition Reactions, Single-Displacement Reactions, Double-Displacement Reactions, and Combustion Reactions

Synthesis Reactions

Reactions of Elements with Oxygen and Sulfur