Key Concepts: Types of Reactions

Core Definitions

• Synthesis (Combination): Two or more reactants combine to form one product: A + B → AB.
• Decomposition: One compound breaks down into two or more simpler substances: AB → A + B.
• Single Replacement: One element replaces another in a compound: A + BC → AC + B.
• Double Replacement: Ions in two compounds exchange partners: AB + CD → AD + CB.
• Combustion: A substance reacts with oxygen, releasing energy as heat and light.
• Precipitate: An insoluble solid formed in a double replacement reaction.