When a cell uses chemical energy to perform work it couples _____ reaction with _____ reaction?
1 answer:
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Answer:
Equation 2, because K being more reactive, exchanges position with Pb in PbNO3.
Explanation:
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In this case, according to the given reactions, it is possible to realize that according to the reactivity series, since K is is group 1A of alkali metals, we infer it is by far more reactive than magnesium, for that reason last two choices can be easily discarded. Now, considering equation 2, it would be necessary to complete it to figure out the correct option:
Whereas it can be seen that potassium exchanges position with Pb according to the double displacement reaction; therefore, the correct answer is "Equation 2, because K being more reactive, exchanges position with Pb in PbNO3".
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