About chemistry (balancing the equation)?

Question

can you give the full answer step by steps...

1)N2+O2-----N2O

2) C2H4+O2-----CO2+

Answer 1

You are supposed to make a box, to explain all the times each element is used.

Answer 2

2N2 + O2 -------2 N2O

Since N2O is the only product ote that there is 1 O on the right side and 2 on the left. Place a 2 in front of the N2O and that will balance the Os.Note then that there are 4 Ns to account for on the right side . Multiply the left side N2 by 2 and you have it balanced

C2H4  + 3O2 --------  2CO2 + 2H2O

total combustion of a C-H containing compound gives CO2 and water on the right side balance the Cs and H2 with what is on the left side ..Then note the number of O2 on the right to balance the Os on the right