Explain how the existence of ions relates to the number of electrons present in atoms of an element?

What is the value of keq for the reaction expressed in scientific notation

What is the polyatamic ion of borate

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