What happens when (write balanced chemical equations):
Ammonia and oxygen combine in the presence of platinum

Explanation

To determine what happens when ammonia (NH₃) and oxygen (O₂) combine in the presence of platinum (Pt), we can follow these steps to write the balanced chemical equation.

### Step 1: Identify the Reactants and Products
The reactants in this reaction are ammonia (NH₃) and oxygen (O₂). The products formed are nitrous oxide (N₂O) and water (H₂O).

### Step 2: Write the Unbalanced Equation
The unbalanced chemical equation for the reaction is:
\[ \text{NH}_3 + \text{O}_2 \rightarrow \text{N}_2\text{O} + \text{H}_2\text{O} \]
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