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Class 10 Chemistry Chapter 1: Chemical Reactions and Equations: This chapter explores the basics of chemical reactions and how they're represented through equations. Here's a detailed summary: 1.Chemical Reactions: Processes where substances (reactants) transform into new substances (products). Indicators include colour change, temperature change, gas evolution, and precipitate formation. 2.Types of Chemical Reactions: A. Combination Reactions: Two or more substances combine to form one product (e.g., 2H_2 + O_2 = 2H_20) B. Decomposition Reactions: One substance breaks into two or more products (e.g., 2H_20 + 2H_2+0O_2) C. Displacement Reactions : One element displaces another from a compound (e.g., Zn + CuSO_4 — ZnSO_4+ Cu). D. Double Displacement Reactions : Exchange of ions between two compounds (e.g., NaCl + AgNO_3 = AgCl + NaNO_3) E. Oxidation-Reduction (Redox) Reactions : Involves gain/loss of oxygen or hydrogen, or electron transfer. F. Chemical Equations : Represent reactions using symbols and formulas. Balancing equations ensures the law of conservation of mass is obeyed. - G. Balancing Chemical Equations : Adjust coefficients to equalize atom counts on both sides. Some key points: - Catalysts speed up reactions without being consumed Exothermic reactions release heat; endothermic reactions absorb heat. 
