Answer:
2H2 + O2 -----> 2H2O
Not sure about the second question though.
Answer:
look in the explanation part
Explanation:
In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time. This law means that energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another.
4) would be your correct answer
