Question

write three chemical reaction in which heat is evolved and three chemical reaction in which heat is absorbed
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Answer 1

There you go

the answer is in above attachment

Answer 2

Answer:

Chemical reactions can be classified based on whether they release heat (exothermic reactions) or absorb heat (endothermic reactions). Here are three examples of each:

Heat-Evolving Reactions (Exothermic Reactions):

Combustion of Methane: CH4 + 2O2 -> CO2 + 2H2O + heat

Neutralization of Hydrochloric Acid and Sodium Hydroxide: HCl + NaOH -> NaCl + H2O + heat

Rusting of Iron: 4Fe + 3O2 -> 2Fe2O3 + heat

Heat-Absorbing Reactions (Endothermic Reactions):

Dissolution of Ammonium Nitrate in Water: NH4NO3 + H2O -> NH4+ + NO3- + heat (absorbed)

Thermal Decomposition of Calcium Carbonate: CaCO3 + heat -> CaO + CO2 (heat absorbed)

Reaction between Sodium Hydroxide and Hydrochloric Acid: NaOH + HCl + heat -> NaCl + H2O (heat absorbed)

To know more about  chemical reaction refer :

https://brainly.in/question/17863827

https://brainly.in/question/48307153

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