Science
What does one mean by exothermic and endothermic reactions? Give examples?
Chemical Reaction
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Answer
Exothermic reactions — Reactions in which heat is released along with the formation of products are called exothermic chemical reactions.
For example, burning of natural gas gives out large amount of heat:
CH4 (g) + 2O2 (g) ⟶ CO2 (g) + 2H2O (g) + Heat
Endothermic reactions — Reactions in which energy is absorbed are known as endothermic reactions.
For example, when carbon is heated with sulphur at high temperature, liquid carbon disulphide is formed:
C + 2S CS2
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Write the balanced chemical equations for the following reactions.
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(d) Barium chloride + Potassium sulphate ⟶ Barium sulphate + Potassium chloride
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(a) Potassium bromide (aq) + Barium iodide (aq) ⟶ Potassium iodide (aq) + Barium bromide (s)
(b) Zinc carbonate (s) ⟶ Zinc oxide (s) + Carbon dioxide (g)
(c) Hydrogen (g) + Chlorine(g) ⟶ Hydrogen chloride (g)
(d) Magnesium (s) + Hydrochloric acid (aq) ⟶ Magnesium chloride (aq) + Hydrogen(g)
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