Had to look for the options and here is my answer.
When we say that a redox reaction is spontaneous, this would mean that there is a formation of positive voltage <span>across the electrodes of a voltaic cell. Therefore, the system that this kind of reaction produces electrical energy is in a GALVANIC CELL. Hope this helps.</span>
A heater letting of heat is an example of release of energy. Please comment if you have any questions about my answer.<span />
Answer:
ions
not sure but I think that's what it is
