Chemical Reactions
Understanding how substances interact and transform.
🔗 Synthesis Reactions
Two or more reactants combine to form a single product.
A + B → AB
Example: 2H₂ + O₂ → 2H₂O (water formation)
✂️ Decomposition Reactions
A single compound breaks into two or more products.
AB → A + B
Example: 2H₂O → 2H₂ + O₂ (electrolysis)
🔥 Combustion Reactions
A substance combines with oxygen, releasing energy as heat and light.
Example: CH₄ + 2O₂ → CO₂ + 2H₂O (burning methane)
⚡ Oxidation-Reduction (Redox)
Electrons are transferred between reactants. One substance is oxidized (loses electrons), another is reduced (gains electrons).
Example: Zn + CuSO₄ → ZnSO₄ + Cu
🧲 Single Displacement
One element replaces another in a compound.
A + BC → AC + B
🔄 Double Displacement
Ions of two compounds exchange places to form two new compounds.
AB + CD → AD + CB
🧪 Acid-Base Reactions
An acid donates a proton (H⁺) to a base. These reactions often produce salts and water.
Example: HCl + NaOH → NaCl + H₂O
☢️ Nuclear Reactions
Changes in atomic nuclei rather than electron arrangements. Include fission, fusion, and radioactive decay. Energy release follows E = mc².