Question

8. Define chemical equation. Show, giving examples, how you can make chemical equation more
informative
(6​

Answer 1

Answer:

(a) The various ways in which a chemical equation can be made more informative are : (i) By indicating the physical states of the reactants and products. Example: Gaseous state is indicated by the symbol (g). (ii) By indicating the heat changes taking place in the reaction.

Answer 2

Answer:

Balanced Equations

As you have already learned earlier, mass can neither be created nor destroyed. This law applies to a chemical reaction too. This means that the total mass of elements in the products of a chemical reaction has to be equal to the total mass of the elements in the reactants. The number of atoms of each element remains the same, before and after a chemical reaction. For example, let’s look at the following chemical equation –

Zinc + Sulphuric acid → Zinc sulfate + Hydrogen

This is further simplified as –

Zn + H2SO4 → ZnSO4 + H2

Now, let us look at the number of atoms of each element on LHS and RHS –

Element Number of atoms in reactants (LHS) Number of atoms in products (RHS)

Zn 1 1

H 2 2

S 1 1

O 4 4

As you can see, the number of atoms of each element on LHS and RHS are the same. Therefore, this chemical equation is a ‘balanced equation’. Now, look at the following equation –

Fe +H2O → Fe3O4 +H2

If you notice, the number of atoms of each element are not the same on both sides of the arrow. Therefore, this is an ‘unbalanced’ equation.

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