[Shard]

Hello, afew quick questions

First of all,

In my notes, my teacher stated that Polar Molecular compounds will dissolve in water, and Non-polar molecules will not. The examples she used were H₂0₂ as a polor molecular compund, and C₂H₆ as a Non-Polar Molecular.

Now, i have acouple of problems first, From what i learned of Polar molecules, they are compounds that have have greatly differing elecrtonegitivty as that the electrons are drawn more closely to one atom then anouther, giveing the compund a positive end and a negitive end. From what i can see H₂O₂ does not have differing electronegitivies and such i dont see how it can be polar.

Lastly, as i was working through some assignments i noticed on my perodic table that there is a polyatomic ion peroxide O₂²⁺ and that led to wonder if H₂0₂ , Hydrogen Peroxide is even molecular, as it seems that it would be 2 hydrogen ions and a peroxide ion.

 If anyone can clear any of this up for i would be very greatful.

Thanks in advance

[Grumples]

Everything you say is true (except that H2O2 is in fact molecular); however, you forget one important piece of information- the shape of the molecule is also incredibly important.  while C2H6 looks like this, (see below) H2O2 looks like this:


        H        H                                 H           H
        |         |                                   \         /
    H-C-------C-H                                 :O---O:
        |         |                                      ¨    ¨
        H        H
           C2H6                                        H2O2

H2O2 is polar because the shape is irregular.  If the shape were linear (such as C2H2), then only the H's could interact with other particles, and since they both have the same charge, that means the molecule would be non-polar.  But since other particles can interact with either an H or an O, it is polar.