Draw lewis structures for the following. include any resonance structures. if more thanone lewis structure can be drawn, use formal charges to decide on the most preferredlewis structure.
1.ch4
2.bf3
3.hcn
4.nh4
5. h2o
6.clo3^-

Compare and contrast physical changes with chemical changes.

The chemical equation below shows the reaction of sodium (na) and chlorine (cl) to form sodium chloride (nacl). 2na + cl2 → 2nacl in this equation, which of the following is a reactant? i. sodium ii. chlorine iii. sodium chloride

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