1. The problem statement, all variables and given/known data Hello. I'm starting to study thermo and I'm kind of confused. In this experiment: http://sci-toys.com/scitoys/scitoys/echem/echem2.html Note: I'm not talking about about the actual solar cell, I'm just talking about the heating up part (until the black layer part). 2. Relevant equations What thermodynamics laws are present? 3. The attempt at a solution I think that the zero law is present when the copper is on the stove in the beginning. Also, the second law is present because there's a chemical reaction when oxide is formed. Am I right? How could the first and third law be present?