Which of the following reactions are considered single replacement reactions? (2 points) pls help me [Select ALL that apply]

2 Mg + O2 → 2MgO

CaO + H2O → Ca(OH)2

Fe + CuCl2 → FeCl2 + Cu

Au2S3 + 3 H2 → 2 Au + 3 H2S

NaNO3 + KC2H3O2 → NaC2H3O2 + KNO3

2 MgNH4PO4 → Mg2P2O7 + 2 NH3 + H2O

What type of reaction is zn + cucl2 → cu + zncl2?

In a copper wire, a temperature increase is the result of which of the following

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