List the following as exothermic or endothermic reaction:
a) Temperature of water increases on adding sulphuric acid to it.
b) Heat is absorbed when water evaporates.
c) Temperature drops when ammonium chloride dissolves in water.
Answers
Answer:
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Explanation:
a) Exothermic Reaction
b) Endothermic Reaction
c) Exothermic Reaction
Answer:
a) Exothermic Reaction
b) Endothermic Reaction
c) Endothermic Reaction
Explanation:
Exothermic reactions release heat to immediate surroundings thereby raising its temperature in the process.
Endothermic reactions absorb heat from its immediate surrounding thereby cooling its surrounding in the process.
Case 1:
The temperature of water increases by adding sulphuric acid to it.
H₂SO₄ + H₂O → H₃O⁺ + HSO₄⁻
Sulphuric acid (H₂SO₄) is a strong acid. When H₂SO₄ is dissociated in water, hydronium (H₃O) ion is formed. The formation of H₃O liberates heat. The addition of sulphuric acid to water is a highly exothermic reaction.
Case 2:
Heat is absorbed when water evaporates.
Evaporation is a process in which water changes its state from liquid to gaseous. This process occurs when the heat is absorbed from the surrounding environment. Hence, the process is endothermic in nature.
Case 3:
The temperature drops when ammonium chloride dissolves in water.
NH₄Cl + H₂O → NH₄OH + HCl
In the above reaction, the reactant ammonium chloride (NH₄Cl) absorbs heat from the surrounding environment to form its product ammonium hydroxide (NH₄OH). Hence, the given reaction is endothermic in nature.
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