What is the thin rigid part of the earth. a. the mantle. b. the outer core. c. the crust. d. inner core

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.

What conclusion can you draw from this experiment about the components of the black ink?