C. single replacement. A single replacement is represented by this formula : AB + C = AC + B
It is 100 because a 5 and up means you round up. also the 9 makes it a 6 rounded up
(c) Cu + S → CuS is a redox reaction
Explanation:
We have the following chemical reactions:
(a) K₂CrO₄ + BaCl₂ → BaCrO₄ + 2 KCl
(b) Pb²⁺ + 2 Br⁻ → PbBr₂
(c) Cu + S → CuS
There is a redox reaction where the elements are changing the oxidation state. The reaction (c) is such a case.
Cu + S → CuS
Cu in elemental state have a oxidation number of 0 and in CuS (copper sulfide) have a oxidation number of +2.
S in elemental state have a oxidation number of 0 and in CuS (copper sulfide) have a oxidation number of -2.
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redox reactions
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The answer to this question is the letter c, d and e, b, and c
I’m pretty sure it would be D
