From the list of compounds below, highlight each covalent compound. For all ionic compounds containing a polyatomic ion, underline the polyatomic ion: CO2, SiO2, KOH MgCI2, H2O, HI, Fe2O3, NaCl, SO4, LiOH, CH4, AlF3, CaCl2, K2SO4, CsNO3, BH3, SF6 XeO2 Na2CO3, C22H46 (or just say which one is which)

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