Question 1in the first law of thermodynamics, , what does q stand for? the internal energy of the systemthe work done by the pistonthe change in the internal energy of the systemthe heat added to the systemquestion 2if the thermal energy of the system increases by 400 j, and 1,100 j of heat were added to the system, how much work did the system do? 400 j700 j1,500 j1,100 j