Give 2 examples of chemical reaction in which heat is absorbed
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1) Reaction between nitrogen and oxygen to form nitrogen monoxide.
2) Calcium carbonate on heating gives you calcium oxide and carbon dioxide.
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2) Calcium carbonate on heating gives you calcium oxide and carbon dioxide.
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Examples of Endothermic Reactions
..When a small quantity of ammonium chloride (NH4Cl) is dissolved in water in a test tube, the tube becomes colder than before. During this chemical reaction heat is absorbed from the surroundings (test tube).
..When crystals of sodium thiosulphate (Na2S2O3.5H2O), commonly called hypo, are dissolved in water, a cooling effect takes place.
..One mole of nitrogen reacts with one mole of oxygen to form two moles of nitric oxide. 180.5kJ of heat is absorbed at constant temperature and the reaction may be expressed as:
..When a small quantity of ammonium chloride (NH4Cl) is dissolved in water in a test tube, the tube becomes colder than before. During this chemical reaction heat is absorbed from the surroundings (test tube).
..When crystals of sodium thiosulphate (Na2S2O3.5H2O), commonly called hypo, are dissolved in water, a cooling effect takes place.
..One mole of nitrogen reacts with one mole of oxygen to form two moles of nitric oxide. 180.5kJ of heat is absorbed at constant temperature and the reaction may be expressed as:
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