Lead can be extracted from lead(II) sulfide, PbS, in two stages.

Stage 1: Lead(II) sulfide is heated in air. It reacts with oxygen to produce lead(II) oxide and sulfur dioxide.
Stage 2: The Lead(II) oxide is then heated in a blast furnace with coke.

(a) Write a chemical equation for the reaction in Stage 1.

2PbS + 3O2 --> 2PbO + 2SO2

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To write the chemical equation for the reaction in Stage 1, we need to identify the reactants and products involved.

Reactants:
1. Lead(II) sulfide (PbS)
2. Oxygen (O₂)

Products:
1. Lead(II) oxide (PbO)
2. Sulfur dioxide (SO₂)

Now, let's write the balanced chemical equation for Stage 1:

PbS + O₂ → PbO + SO₂

Please note that the equation is not yet balanced, so we need to balance it by adjusting the coefficients.