Question

What are the conventions used in writing a
chemical equation?
EXPLAIN.​

Answer 1

Answer:

First : Write the state of the compound and element used in the equation ( liquid solid and gas)

Second : write down the catalyst used in the reaction ( heat, nickel, sunlight , etc)

Third : Follow the law of conservation of mass and equal the mass of reactant side to the mass of product side of the reaction.

Answer 2

Answer:

Conventions used in writing a chemical equation:

Explanation:

1. The reactants are written on the left hand side ( LHS ).

2. The products are written on the right hand side ( RHS ).

3. If there are two or more reactants, a plus sign ( + ) is written between each of them. Similarly, if there are two or more products, a plus sign is written between each of them.

4. There is a connecting arrow ( ⟶ ) between reactants and products which is pointing from reactants towards the products. The arrow has an important role in the chemical equation. It represents the direction of the chemical reaction. In some chemical reactions, heat is to be given from outside, then it is indicated by the sign ( $\triangle$ ) written above the arrow.

5. In some reactions, special conditions like temperature, pressure, catalyst, etc., are mentioned above the arrow ( ⟶ ) which is ponting towards the product side.

6. To make the chemical equation more informative, physical states of each of the reactants and products are also mentioned in the below of their symbols. The special symbols like g ( for gaseous state ), l ( for liquid state ), s ( for solid state ), aq ( for aqueous solution ) are written in brackets as a subscript with the symbols of reactants and products.

7. If the product is in gaseous state, instead of writing ( g ), it is indicated by an arrow ( ↑ ) pointing upwards.

8. If there is formation of a precipitate which is also called insoluble solid, instead of writing ( s ), it is indicated by an arrow ( ↓ ) pointing downwards.

9. Special information or names of reactants and products are written below their formulae.

Concepts:

1. Chemical Reactions:

The reactions in which the composition of matter changes and that change remains permanent are called as Chemical Reactions.

2. Chemical Equation:

The equation representing a chemical reaction is called as Chemical Equation.

3. Reactants:

The substances which take part in a chemical reaction are called as Reactants.

4. Products:

The substances which are formed as a result of the chemical reaction are called Products.

5. Precipitate:

The insoluble solid substance formed during a chemical reaction is called Precipitate.

Generally, precipitate is formed during a Double Displacement Reaction.

6. Double Displacement Reaction:

The chemical reaction in which the ions of the reactants are exchanged resulting the formation of precipitate is called Doble Displacement Reaction.

It is also called Precipitation Reaction.