Answer:
deposition is the change from gas to solid
Answer:
i believe it's c but I'm not one hundred percent sure
Explanation:
Answer:
yes
Explanation:
yes because u cant observe a physical change, u can't see with your eye the temperature
2H2 + O2 = 2H2O since two elements created a compound, in this case water.
Answer:

Explanation:
Hello,
In this case, the total heat is computed via:

It means, by adding all the involved heat, which simply result:

Thus, such heat must be provided to the ethanol, that is why it remains positive.
Best regards.