The principal natural ore of lead is galena, which is primarily lead (II) sulfide. Lead (II)
sulfide can be converted to lead (II) oxide by heating strongly in air, with sulfur dioxide
gas as a by-product. Lead (II) oxide can then be heated with chemical carbon (coke),
producing pure lead metal and carbon dioxide gas. Write balanced chemical equations
for the reaction of lead (II) sulfide with oxygen gas, and for the reaction of lead (II) oxide
with carbon.

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