Smart study notes of 10th chapter first
Class 10 Science Chapter 1: Chemical Reactions and Equations – Notes & MCQ Test 📘 1. Chemical Reaction A chemical reaction is a process in which one or more substances change into new substances with different properties. Example: Mg + O₂ → MgO 📘 2. Chemical Equation A chemical equation is the symbolic representation of a chemical reaction. Example: Zn + HCl → ZnCl₂ + H₂ 📘 3. Balanced Chemical Equation A balanced chemical equation has equal number of atoms of each element on both sides. Example: 2Mg + O₂ → 2MgO 📘 4. Types of Chemical Reactions 1. Combination Reaction Two or more substances combine to form one product. Example:CaO + H₂O → Ca(OH)₂ 2. Decomposition Reaction A compound breaks down into simpler substances. Example: CaCO₃ → CaO + CO₂ 3. Displacement Reaction A more reactive element displaces a less reactive element. Example: Zn + CuSO₄ → ZnSO₄ + Cu 4. Double Displacement Reaction ...