Ch-1 chemical reaction and equation class 10th notes
Class 10th Chemistry – Chapter 1: Chemical Reactions and Equations (Deep Conceptual Notes) 1. What is a Chemical Reaction? A chemical reaction is a process where one or more substances (reactants) are transformed into new substances (products). ______________________________________________ Key features: Bonds in reactants break. New bonds form in products. Energy is either absorbed or released. Examples: Rusting of iron: Fe + O₂ + H₂O → Fe₂O₃·xH₂O Burning of magnesium: 2Mg + O₂ → 2MgO ______________________________________________ 2. Chemical Equations Representation of a chemical reaction using symbols and chemical formulae. Example: Mg + O₂ → MgO (unbalanced) ______________________________________________ 3. Balancing Chemical Equations Law of Conservation of Mass: Mass is neither created nor destroyed. Number of atoms of each element must be equal on both sides. Balanced Example: 2Mg + O₂ → 2MgO ______________________________________________ 4. Types of Chemical Reactions (i) ...