![]() It is a chemical reaction in which heat energy is given out.Į.g. What is meant by exothermic and endothermic reactions? Give examples.ĭifferentiate between exothermic and endothermic reactions.Įxothermic reaction. Mg(s) + 2HCl(aq) → MgCl 2 (aq) + H 2 (g) - Displacement reaction (d) Magnesium (s) + Hydrochloric acid (aq) → Magnesium chloride (aq) + Hydrogen (g) H 2(g) + Cl 2 (g) → 2HCl(g) - Combination reaction (c) Hydrogen (g) + Chlorine (g) → Hydrogen chloride (g) ZnCO 3 (s) → ZnO (s) + CO 2 (g) - Decomposition reaction (b) Zinc carbonate (s) → Zinc oxide (s) + Carbon dioxide (g) ![]() (a) Potassium bromide (aq) + Barium iodide (aq) → Potassium iodide (aq) + Barium bromide (s)ĢKBr (aq) + Bal 2 (aq) → 2KI (aq) + BaBr 2 (aq) - Double displacement reaction Write the balanced chemical equation for the following reaction and identify the type of reaction in each case. (d) Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride. (c) Aluminium + Copper chloride → Aluminium chloride + Copper. (b) Zinc + Silver nitrate → Zinc nitrate + Silver. ![]() (a) Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water Write the balanced chemical equations for the following reactions : (d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.īalance the following chemical equations : (c) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.ģBaCl 2 + A12(SO 4) 3 → 2AlCl 3 (aq) + 3BaSO 4 (s)↓ (b) Hydrogen sulphide gas burns in air to give water and sulphur dioxide.ĢH 2S (g) + 3O 2 (g) → 2H 2O (l) + 2SO 2 (g) (a) Hydrogen gas combines with nitrogen to form ammonia. Translate the following statements into chemical equations and then balance them : The chemical equation should be balanced because law of conservation of mass holds good i.e., the total mass of the reactants must be equal to the total mass of the products. It is a chemical equation in which number of atoms of each element are equal on both sides of the equation. What is a balanced chemical equation? Why should chemical equations be balanced?īalanced chemical equation. (b) Chlorine gas and iron hydroxide are produced. (a) Hydrogen gas and iron chloride are produced. What happens when dilute hydrochloric acid is added to iron filings? Which of the statements about the reaction below are incorrect? PSEB 10th Class Science Guide Chemical Reactions and Equations Textbook Questions and Answers PSEB Solutions for Class 10 Science Chapter 1 Chemical Reactions and Equations Punjab State Board PSEB 10th Class Science Book Solutions Chapter 1 Chemical Reactions and Equations Textbook Exercise Questions and Answers.
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