Question

# Identify the reaction, give example with equation.$$(I)$$ products become hot/warm$$(II)$$ product is in soluble$$(III)$$ product cools down.

Solution

## (i) Product becomes hot/warm:- Any exothermic reaction, i.e. reactions which involve release of heat make the product hot/warm. Eg:- All combustion reactions, A neutralization reaction etc.$$NaOH(aq)+HCl(aq)\longrightarrow NaCl(aq)+{ H }_{ 2 }O(l)+Heat$$ sodium$$\quad \quad \quad \quad$$Hydro$$\quad \quad \quad$$ sodium$$\quad \quad$$ water hydroxide$$\quad \quad$$ chloro acid$$\quad \quad$$cloride $$\Delta G=-52kL/mol$$ (ii) Product is in soluble:- Technical reaction in which the product remain as a precipitate which is soluble. $$2AgN{ O }_{ 3 }(aq)\quad +\quad Mg{ Br }_{ 2 }\quad \longrightarrow \quad 2AgBr(s)\quad +\quad Mg{ ({ NO }_{ 3 }) }_{ 2 }(aq)$$ silver nitrate               magnesium                 silver              Magnesium                                  Bromide                        Bromide           NitrateIn the above reaction silver Bromide $$(AgBr)$$ remains as a precipitate as it is insoluble in aquas magnesium nitrate.(iii) Product cools down:- Any endothermic reaction i.e, reactions which involve absorption of energy from the surroundings eventually cools down the products. Eg:-$$N{ H }_{ 4 }Cl(s)\quad +{ \quad H }_{ 2 }O(l)\quad \longrightarrow \quad { NH }_{ 4 }Cl(aq)\quad -\quad Heat$$ Ammonium          Water                        aqeous cloride                                                  Ammonium                                                                clorideChemistry

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