Final answer:
In chemistry, reactions between copper and sulfur result in the formation of copper sulfide compounds like CuS and Cu₂S.
Explanation:
Reaction 1: Cu + S → CuS
Reaction 2: 2Cu + S → Cu₂S
When copper reacts with sulfur, it can form copper sulfide compounds of different oxidation states like CuS and Cu₂S, respectively. Balancing these reactions helps understand the chemical changes in the combination of copper and sulfur.
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