Two identical refrigerators are plugged in for the first time. Refrigerator A is empty (except for air), and refrigerator B is filled with jugs of water. The compressors of both refrigerators immediately turn on and begin cooling the interiors of the refrigerators. After two hours, the compressor of refrigerator A turns off while the compressor of refrigerator B continues to run. The next day, the compressor of refrigerator A can be heard turning on and off every few minutes, while the compressor of refrigerator B turns off and on every hour or so (and stays on longer each time). Explain these observations.
Two substances A and B, initially at different temperatures, are thermally isolated from their surroundings and allowed to come into thermal contact. The mass of substance A is twice the mass of substance B, but the specific heat capacity of substance B is four times the specific heat capacity of substance A. Which substance will undergo a larger change in temperature?
So this question asked us to identify, which is the proper expression for the heat emitted in a chemical reaction with constant pressure. And so that is Delta H. And so our options. The correct answer is a Delta T minus w. And the reason we know that it's this is because Delta agent constant pressure is defined as equaling Delta E minus P, Delta V and P Delta V is equal to work, and so are we. Just plug that in for P Delta V and we get that are correct. Answer for this expression is Delta E minus. W.