Tiêu đề Chapter - 1 Chemical_Reactions_and_Equations.pdf ✅

ChemContent Oxygen 2 1 × 2 = 2 Step 5 There are two oxygen atoms on either side of the equation but one magnesium atom on the reactant's side and two on the product's side. Therefore, multiply the magnesium atom by 2 on the left hand side. Component Reactant Product Magnesium 1 × 2 = 2 2 Oxygen 2 2 Balanced equation is, ∴ The number of atoms of each element of reactants = The number of atoms of each element of products Step 6 Writing Specific Conditions on the Arrow The reaction is carried out in the presence of ‘Heat’. On heating, magnesium combines with oxygen present in air to form magnesium oxide. Step 7 Writing Symbols of Physical States Using these steps, you can balance any chemical equation. Types of Chemical Reactions 1. Combination Reaction When two or more substances combine to form a single product, the reaction is known as a combination reaction. For example: In the laboratory, iron sulphide is prepared by mixing iron and sulphur. Fe(s) + S(s) → FeS(s) Formation of slaked lime by the reaction of calcium oxide with water ● Endothermic Reaction: The reactions accompanied by the absorption of heat are called endothermic reactions.