Question

(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.

Answer 1

Answer:

(a) A combination reaction is a reaction in which two or more elements or compounds are reacted together to from a reaction.

(b) Carbon dioxide

(c)Carbonic acid

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Answer 2

Explanation:

(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.

$A+B\rightarrow AB$

(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.

$\mathrm{CaO}(\mathrm{s})+\mathrm{H}_{2} \mathrm{O}(|) \longrightarrow \mathrm{Ca}(\mathrm{OH})_{2}(\mathrm{s})$

(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.

$\mathrm{NH}_{4} \mathrm{Cl}(\mathrm{s})+\mathrm{H}_{2} \mathrm{O}(\mathrm{I}) \rightarrow \mathrm{NH}_{4} \mathrm{Cl}(\mathrm{aq})-\text { Heat }.$