Chemical Equations and Reactions

Chemical equations show what reacts and what forms, and they must balance because atoms are neither made nor lost. Students complete word equations, give state symbols, and balance equations such as H₂ + O₂ → H₂O and CH₄ + O₂ → CO₂ + H₂O using numbers in front only. They also sort reactions as exothermic or endothermic and explain why burnt magnesium gains mass.