Tiêu đề Chapter - 1 Chemical_Reactions_and_Equations.pdf ✅

ChemContent ● Exothermic Reaction: The reactions accompanied by the evolution of heat are called endothermic reactions. 2. Decomposition Reaction A chemical reaction in which a single compound splits into two or more simple substances is called a decomposition reaction. Correct way of heating the boiling tube containing crystals of ferrous sulphate and of smelling the odour For example: When mercuric oxide is heated in a crucible, the orange-red powder begins to darken and a silver mirror begins to deposit on the cooler parts of the crucible. ● Thermal Decomposition Reaction: The decomposition reactions carried out by heating are known as thermal decomposition reactions. ● Photochemical reaction: The chemical reactions which proceed with the absorption of light energy are called photochemical reactions. 3. Displacement Reaction Reactions in which the more reactive element displaces the less reactive element from its compound are called displacement reactions. Iron nails dipped in copper sulphate solution For example: Zinc displaces copper in copper sulphate to form zinc sulphate.