Class 10 chemistry chapter 1
Class 10 Chemistry Chapter 1 – Chemical Reactions and Equations 📘 Class 10 Chemistry – Chapter 1 Chemical Reactions and Equations 1. What is Chemistry? Chemistry is the branch of science that deals with the composition, structure, properties and changes of matter . 2. Chemical Reaction A chemical reaction is a process in which one or more substances (reactants) are converted into new substances (products) with different properties. Example: Magnesium + Oxygen → Magnesium Oxide Observations during Chemical Reaction Change in colour Change in temperature Evolution of gas Formation of precipitate Change in state 3. Chemical Equation A chemical equation is the symbolic representation of a chemical reaction using symbols and formulas. Word Equation: Calcium Carbonate → Calcium Oxide + Carbon Dioxide Chemical Equation: CaCO₃ → CaO + CO₂ 4. Balanced Chemical Equation Unbalanced: H₂ + O₂ → H₂O Balanced: 2H₂ + O₂ → 2H₂O Law of Co...