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Download Class 10th science chapter 1 short notes and more Cheat Sheet Environmental science in PDF only on Docsity!
* Chemical Reaction A process in which one or more substances (reactants) are converted into new substances (products). «> Example: 2Mg + 0, + 2MgO * Chemical Equation Asymbolic representation of a chemical reaction using formulas. «> Balanced Equation: 2H2+ O24 2H20 V Law of Conservation of Mass: Mass remains same > atoms must be equal on both sides. Observations (Activity Based) ¢ Mgribbon burns > white ash forms Fe in CuSO, > colour changes (blue > green) e Zn+acid > hydrogen gas released * Types of Chemical Reactions 1. Combination Reaction Two or more substances combine to form a single product. o& 2Mg + 02> 2MgO 2. Decomposition Reaction A single compound breaks into simpler substances. «& CaCO; > CaO + CO2 3. Displacement Reaction Amore reactive element displaces a less reactive one. o Fe + CuSO. > FeSO, + Cu 4. Double Displacement Reaction Exchange of ions between two compounds. «& Na.SO, + BaCk > BaSO,! + 2NaCl * Oxidation & Reduction * Rancidity Oxidation of food leading to bad smell and taste. «© Prevention: Airtight containers, refrigeration * Corrosion Slow deterioration of metals due to reaction with air/moisture. «& Example: Rusting of iron (Fe20s) Oxidation: Addition of oxygen / removal of hydrogen eduction: Removal of oxygen / addition of hydrogen «© Example: CuO + Hz > Cu + H20 V Both together = Redox Reaction 
