Consider the equations below. H2 -> 2H
C2H4+H -> C2H5
C2H5+H -> C2H6
When these equations are added together, what will the overall equation be?
1. C2H4+H2 -> C2H6
2. H2+C2H4+2H+C2H5+ -> 2H+C2H5+C2H6
3. C2H4+C2H5+H2 -> C2H5+C2H6

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

i just learnt this recently but i need to look through my notes again

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.