The Aufbau Diagram below represents which atom? HELP ITS TIMED AND NO LINKS!!!

Which compound contain an iron with a 3+ charge

Table sugar completely dissolved in water is an example of a?

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