Lewis structure- and bases check please

[jewilki1]

Could you check these?
Which one of the following ions or molecules can act as a base?

H2S NH4 ALH3 CH3 NH2
I chose H2S. Is this correct?

Also I had to weire a resonable lewis structure for the molecule that has the following skeletal structure: O2NONO2

I wrote: O-O-N-O-N-O-O I am not sure how to put the dots around it on this site. Thanks for checking

 

[Gokul43201]

Could you check these?
Which one of the following ions or molecules can act as a base?
H2S NH4 ALH3 CH3 NH2
I chose H2S. Is this correct?

No, it's not. Why did you choose that ? What is the definition of a bse ?

Also I had to weire a resonable lewis structure for the molecule that has the following skeletal structure: O2NONO2
I wrote: O-O-N-O-N-O-O I am not sure how to put the dots around it on this site. Thanks for checking

Can't say if it's correct unless you show us the unbonded electrons too. You can try using the "code" tags.

Example :

   ..  ..
 : O = O :

 

[Umabel]

H2S CAN act as a base, no? And so can NH2 right? I have mixed feelings about CH3...(nothing like silly questions to confuse your brain huh?)
sorry to butt in, just had a BRUTAL adv organic test with all these basic/acid strength questions...:rofl:

Do what Goku says, but take it from me: know ALL the definitions of acids and bases like THE BACK OF YOUR HAND...and other parts you're...familiar with...

 

[Cesium]

I highly doubt that H2S can behave as a base.

 

[Umabel]

Then what is the difference between H2O and H2S? I used the same analogy here, though I'm not surprised I'm wrong :shy:

 

[Cesium]

For all practical purposes, H2S acts as an acid. In water H2S is slightly acidic with a pKa of 6.89. I don't know perhaps if you liquified H2S then it would be amphoteric like water.