When energy is changed from one form to another, .
A. a physical change occurs
B. all of the energy can be accounted for
C. some of the energy is lost entirely
D. all of the energy is changed to a useful form
(please explain why)

Since energy cannot be created or destroyed and it can only change form or be transferred from one object to another.

The total amount of energy and matter in the Universe remains constant, merely changing from one form to another. The First Law of Thermodynamics (Conservation) states that energy is always conserved, it cannot be created or destroyed. In essence, energy can be converted from one form into another.

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the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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