Translate the following statements into chemical equations and balance them.

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Translate the following statements into chemical equations and balance them.

(a) Hydrogen gas combines with nitrogen to form ammonia.

(b) Hydrogen sulphide gas burns in air to give water and sulphur dioxide.

(c) Barium chloride reacts with aluminium sulphate to give Aluminium chloride and a precipitate of barium sulphate.

(d) Potassium metal reacts with water to give potassium hydroxide and Hydrogen gas.

Note: Chemical equations are symbolic representations that help people understand the different types of chemical changes. Chemical formulas for substances undergoing the change (reactants) and substances generated by the change (products) are separated by an arrow and preceded by integer coefficients indicating their relative numbers. Using mass conservation law, the balancing of a chemical equation is possible. In general, mass cannot be created or destroyed; it can only change states.

What is a balanced chemical equation? Why should a chemical equation be balanced?

a) H2 + N2 → NH3

The number of H atoms in the reactant is 2 but on the product side the number of H atoms is 3. In order to balance this equation, we should put 3 before the hydrogen in the reactant and add 2 to ammonia in the product.

3H2 + N2 → 2NH3

b) H2S + O2 → H2O + SO2

The number of H atoms is equal on both sides and so are the S atoms. O atom on both sides is not equal, let’s add 3 to oxygen in the reactant side then now there are 6 atoms in the reactant. We can add 2 before water and sulphur dioxide in the product.

2H2S + 3O2 → 2H2O + 2SO2

c) BaCl2 + Al2(SO4)3 → BaSO4 + AlCl3

Cl atom in reactant is 2 but the Cl atom in product is 3. so in order to balance it we should add 3 before BaCl2 and 2 before AlCl3.

3BaCl2 + Al2(SO4)3 → BaSO4 + 2AlCl3

d) K + H2O → KOH + H2

There are two hydrogen atoms in the reactant side and three on the product side. In order to balance this equation, we should put 2 before K, H2O and KOH .

2K + 2H2O → 2KOH + H2

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