Chemistry, asked by ramdass1518, 1 year ago

(a) Define a combination reaction.
(b) Give one example of a combination reaction which is also exothermic.
(c) Give one example of a combination reaction which is also endothermic.

Answers

Answered by letmeanswer12
1

(a) Combination reaction:

  • The combination reaction is a process in which two or more reactants combine to produce single product.
  • The reactants 'A' and 'B' combines to produce 'AB' as product.
  • \bold{A+B\rightarrow AB}

(b) Exothermic reaction:

  • The exothermic reaction occurs with decrease in enthalpy and increase in entropy.
  • In this process, the heat is released to the surrounding.
  • For example: Reaction between quick lime and water.
  • \bold{\mathrm{CaO}_{(\mathrm{s})}+\mathrm{H}_{2} \mathrm{O}_{(l)} \longrightarrow \mathrm{Ca}(\mathrm{OH})_{2}_{(\mathrm{s})}}

(c) Endothermic reaction:

  • The endothermic reaction occurs with decrease in entropy and increase in enthalpy.
  • In this process, the heat is absorbed from the surrounding.
  • For example: Mixing ammonium chloride with water to produce aqueous ammonium chloride.
  • \bold{\mathrm{NH}_{4} \mathrm{Cl}_{(\mathrm{s})}+\mathrm{H}_{2} \mathrm{O}_{(l)} \rightarrow \mathrm{NH}_{4} \mathrm{Cl}_{(\mathrm{aq})}-\text { Heat }}

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Answered by dk6060805
2

Exothermic Releases Heat and vice versa for Endothermic

Explanation:

a.) When two or more materials combine to give a single substance with either getting heated or releasing heat are called combination reaction.  

b.) The example for exothermic reaction is -

CaO + H_2O --> Ca(OH)_2 + Heat

Calcium Oxide + Water --> Calcium Hydroxide and Heat

c.) The example for endothermic reaction is -

N_2 (g) + O_2 (g) + Heat --> 2NO (g)

Reaction is endothermic as heat is given to the reaction.

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