What is the isotope that is formed from the ALPHA decay of Cobalt-57?

One does not belong why? ice, gold ,wood ,diamond and table salt

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

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