Chemical Reactions and Equations
Chemical reactions are processes in which substances undergo chemical changes to form new
substances with different properties.
Topics Covered:
1 What is a Chemical Reaction?
2 Types of Chemical Reactions
3 Balancing Chemical Equations
4 Oxidation and Reduction (Redox Reactions)
5 Effects of Oxidation in Everyday Life
1. Chemical Reaction:
A process where one or more substances react to form new substances.
Example: Burning of magnesium ribbon:
2Mg + O■ → 2MgO
2. Types of Reactions:
• Combination Reaction
• Decomposition Reaction
• Displacement Reaction
• Double Displacement Reaction
3. Balancing Equations:
Law of conservation of mass states that mass can neither be created nor destroyed.
4. Oxidation & Reduction:
Oxidation = Loss of electrons
Reduction = Gain of electrons
5. Everyday Effects:
Rusting, rancidity, corrosion