When hydrogen gas is passed over heated copper (II) oxide, copper and steam are formed. Write the balanced chemical equation for this reaction and state (i) the substance oxidized and (ii) the substance reduced in the reaction.

Explanation

To solve the question, we need to follow these steps:

### Step 1: Write the reactants and products
When hydrogen gas (H₂) is passed over heated copper(II) oxide (CuO), the products formed are copper (Cu) and steam (H₂O).

### Step 2: Write the unbalanced chemical equation
The unbalanced chemical equation for the reaction is:
\[ \text{H}_2 + \text{CuO} \rightarrow \text{Cu} + \text{H}_2\text{O} \]
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