Answer:
The gain in mass by the negative electrode is the same as the loss in mass by the positive electrode. So the copper deposited on the negative electrode must be the same copper ions that are lost from the positive electrode.
CaO
Calcium reacts with oxygen to form calcium oxide. The chemical equation for this reaction is Ca + O2 → CaO.
Answer: A because it’s correct
2. When a fire is burning, chemical energy is turned into visible energy in the form of light and thermal energy in the form of heat.
3. A burning fire is exothermic because a lot of heat is given off as the wood is converted into carbon dioxide and water.
4. Energy is never created but simple recycled and changed into other forms.
