What would the Lewis dot Structure for CH2N2H2 look like?

Can someone me with these questions plz.

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.