| Reaction Name | Reaction Type | Reactants | Products | Observations | Energy Change | Chemical Equation |
|---|---|---|---|---|---|---|
| Burning of Magnesium ribbon | Combination Reaction | Magnesium, Oxygen | Magnesium oxide | Burns with a dazzling white flame; changes into a white powder | Exothermic | $2Mg(s) + O_{2}(g) \rightarrow 2MgO(s)$ |
| Formation of slaked lime | Combination Reaction | Calcium oxide (Quick lime), Water | Calcium hydroxide (Slaked lime) | Reacts vigorously; beaker becomes hot | Exothermic | $CaO(s) + H_{2}O(l) \rightarrow Ca(OH)_{2}(aq) + Heat$ |
| Heating of ferrous sulphate | Decomposition Reaction (Thermal) | Ferrous sulphate crystals | Ferric oxide, Sulphur dioxide, Sulphur trioxide | Green colour of crystals changes; characteristic odour of burning sulphur | Endothermic | $2FeSO_{4}(s) \xrightarrow{Heat} Fe_{2}O_{3}(s) + SO_{2}(g) + SO_{3}(g)$ |
| Heating of lead nitrate | Decomposition Reaction (Thermal) | Lead nitrate | Lead oxide, Nitrogen dioxide, Oxygen | Emission of brown fumes | Endothermic | $2Pb(NO_{3}){2}(s) \xrightarrow{Heat} 2PbO(s) + 4NO{2}(g) + O_{2}(g)$ |
| Decomposition of silver chloride | Decomposition Reaction (Photochemical) | Silver chloride | Silver, Chlorine | White silver chloride turns grey in sunlight | Endothermic | $2AgCl(s) \xrightarrow{Sunlight} 2Ag(s) + Cl_{2}(g)$ |
| Iron nails in copper sulphate | Displacement Reaction | Iron, Copper sulphate solution | Iron sulphate, Copper | Iron nail becomes brownish; blue colour of solution fades | Not in source | $Fe(s) + CuSO_{4}(aq) \rightarrow FeSO_{4}(aq) + Cu(s)$ |
| Reaction of sodium sulphate and barium chloride | Double Displacement Reaction | Sodium sulphate, Barium chloride | Barium sulphate, Sodium chloride | Formation of a white precipitate of barium sulphate | Not in source | $Na_{2}SO_{4}(aq) + BaCl_{2}(aq) \rightarrow BaSO_{4}(s) + 2NaCl(aq)$ |
| Reaction of lead nitrate with potassium iodide | Double Displacement Reaction | Lead nitrate solution, Potassium iodide solution | Lead iodide, Potassium nitrate | Formation of a yellow precipitate | Not in source | $Pb(NO_{3}){2}(aq) + 2KI(aq) \rightarrow PbI{2}(s) + 2KNO_{3}(aq)$ |
| Action of acid on zinc | Displacement Reaction | Zinc granules, Dilute sulphuric acid or Hydrochloric acid | Zinc sulphate (or Zinc chloride), Hydrogen gas | Evolution of gas bubbles; change in temperature (flask becomes warm) | Exothermic | $Zn(s) + H_{2}SO_{4}(aq) \rightarrow ZnSO_{4}(aq) + H_{2}(g)$ |
| Electrolysis of water | Decomposition Reaction (Electrolytic) | Water | Hydrogen gas, Oxygen gas | Bubbles formed at electrodes; volume of gas at one electrode is double the other | Endothermic | $2H_{2}O(l) \xrightarrow{Electricity} 2H_{2}(g) + O_{2}(g)$ |
| Decomposition of limestone | Decomposition Reaction (Thermal) | Calcium carbonate (Limestone) | Calcium oxide (Quick lime), Carbon dioxide | Used in cement manufacture | Endothermic | $CaCO_{3}(s) \xrightarrow{Heat} CaO(s) + CO_{2}(g)$ |
| Oxidation of copper | Oxidation Reaction | Copper powder, Oxygen | Copper(II) oxide | Surface of copper becomes coated with black substance | Not in source | $2Cu(s) + O_{2}(g) \xrightarrow{Heat} 2CuO(s)$ |
| Respiration | Exothermic Reaction | Glucose, Oxygen | Carbon dioxide, Water | Provides energy to cells | Exothermic | $C_{6}H_{12}O_{6}(aq) + 6O_{2}(aq) \rightarrow 6CO_{2}(aq) + 6H_{2}O(l) + energy$ |
| Burning of natural gas | Exothermic Reaction | Methane, Oxygen | Carbon dioxide, Water | Not in source | Exothermic | $CH_{4}(g) + 2O_{2}(g) \rightarrow CO_{2}(g) + 2H_{2}O(g)$ |
| Burning of coal | Combination Reaction | Carbon (Coal), Oxygen | Carbon dioxide | Not in source | Exothermic | $C(s) + O_{2}(g) \rightarrow CO_{2}(g)$ |
| Formation of water | Combination Reaction | Hydrogen gas, Oxygen gas | Water | Not in source | Exothermic | $2H_{2}(g) + O_{2}(g) \rightarrow 2H_{2}O(l)$ |
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