Write equations for the reactions of
(i) iron with steam
(ii) calcium and potassium with water

Explanation

To answer the question, we will write the chemical equations for the reactions of iron with steam, and calcium and potassium with water.

### Step-by-Step Solution:

#### (i) Reaction of Iron with Steam:
1. **Identify the Reactants**: The reactants are iron (Fe) and steam (H2O in gaseous form).
2. **Identify the Products**: The products of the reaction are iron oxide (FeO or Fe2O3, depending on the conditions) and hydrogen gas (H2).
3. **Write the Balanced Equation**: The balanced equation for the reaction of iron with steam can be written as:
...