A zinc-copper cell is constructed: Zn | Zn2+(1M) | Cu. What occurs to the mass of the copper electrode as the reaction proceeds? (Zinc is above copper in the activity series of metals.) It increases
It decreases
Cannot be determined
It remains the same

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?