Question

make a short note on type of reaction
class 7​

Answer 1

Answer:

The different types of chemical reaction are:

1. Combination reaction

2. Decomposition reaction

3. Displacement reaction

4. Neutralisation reaction

5. Double displacement reaction

6. Oxidation and reduction reaction

1. Combination reaction:

In a combination reaction, two or more elements combine to form a compound or an element and a compound can combine to form a new compound

For example:

Magnesium and oxygen combine when heated to form magnesium oxide.

Answer 2

Types of Chemical ReactionsExplanationGeneral ReactionCombination reactionTwo or more compounds combine to form one compound.A + B → ABDecomposition reactionThe opposite of a combination reaction – a complex molecule breaks down to make simpler ones.AB → A + BPrecipitation reactionTwo solutions of soluble salts are mixed resulting in an insoluble solid (precipitate) forming.A + Soluble salt B  → Precipitate + soluble salt CNeutralization reactionAn acid and a base react with each other. Generally, the product of this reaction is a salt and water.Acid + Base → Salt + WaterCombustion reactionOxygen combines with a compound to form carbon dioxide and water. These reactions are exothermic, meaning they give off heat.A + O2 → H2O + CO2Displacement reactionOne element takes place with another element in the compound.A + BC → AC + B