Which term describes a chemical reaction in which water is gained?

Dehydration synthesis

Explanation:

In dehydration reaction, their are two products among which one is water. This is because of two monomers that is two single molecules react with each other to form product of the reaction.

The H molecule attaches with the OH that result in the formation of water molecule.

1. (1.2kw)x(15/60hours) = .3kwh --> a

2. (5kw)x(90/60hours)x(8cents/kwh) = $0.60 --> d

3. microwave --> 1200 watts = (1.2kw)x(6/60hours) = .12kwh

coffee-maker --> 900 watts = (.9kw)x(10/60hours) = .15kwh

therefore, it requires more energy for the coffee-maker to do the same amount of work.

so the answer is a.