Question

Explain the different types of chemical reactions ​

Answer 1

1.)Combination/Synthesis reaction: In this reaction, two simple reactants react to form one product.Such reactions may be represented by equations of the following form: X + Y → XY.

2.)Displacement reaction: In this reaction(mostly an ionic reaction), a more reactive element displaces a less reactive element form it's salt.Such reactions may be represented by equations of the following form: XY → X + Y.

3.)Decomposition reaction: Exact opposite of Combination reaction. A compound dissociates into elements and/or simpler compounds.Such reactions may be represented by equations of the following form: Z + XY → X + ZY.

4.)Double displacement reaction: Think a displacement reaction, except replace the 'reactive element' with another. Basically from the two compounds the two cations(or two anions, if you want to imagine like that) switch places.Such reactions may be represented by equations of the following form: AB + XY → XB + AY.

Examples

1.)Combination: C + O2 → CO2 (Carbon burnt in oxygen to give carbon dioxide.)

2.)Decomposition: 2KClO3 →2KCl + 3O2 (Decomposition of oxygen containing salts to give oxygen and a simpler salt, like that of Pottasium Chlorate here)

3.)Displacement: Fe + Cu(NO3)2 → Fe(NO3)2 + Cu (Replacement of Copper from it's salt by a more reactive metal)

4.)Double displacement: HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l) [Neutralization reaction b/w Hydrochloric acid and Sodium hydroxide

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Answer 2

(1)Combination reaction: When two or more reactants react with each other to form a single compound then it is called combination reaction.

For ex: Mg reacts with oxygen to form MgO2.

(2)Decomposition reaction: When a reactant decomposes into two or more products. There are three types of decomposition;

(a) Electrolytic

(b) Thermal

(c) Photolytic

(3) Displacement reaction: A more reactive element displaces a less reactive element from its salt solution.

(4) Double displacement reaction: The reactions which involves exchange of ions (cations and anions) between the reactants are called double displacement reactions.

(5) Redox reactions: The reactions in which both oxidation and reduction occurring together are known as redox reactions.

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