here are 3 covalent bonds, how do they look with the lewis dot structure?

Question

HCN HCO HNNH
H

Answer 1

HCN Let electrons belonging to H be x's. Let electrons belonging to C be *'s. Let electrons belonging to N be o's. Then HCN:

Hx*C then C***Nooooo

Next HN=NH:

H*oNooooN*oN

I think that you mean next H2C=O. I think that you can work that out for yourself.

Answer 2

HCN- there is one bond (two electrons/dots) between the H-C , 3 between the C-N , and and extra lone pair on the N

H2CO- there is one bond between each of the H-C, 2 between the C-O, two lone pairs on the O.

HNNH- there is one bond between the H-N and N-H on both ends, two bond between the N-N, and two lone pairs with one on each N.

Hope this helps. I can't really draw it out on here.