February 25, 2011


This is what a hydrogen peroxide molecule looks like. There are arrows pointing from the hydrogen atoms towards the oxygen atoms, because hydrogen atoms are less electronegative. Hydrogen peroxide has a bent shape and is a polar molecule.



It may seem odd that hydrogen peroxide has a bent shape. When the Lewis structure is drawn it looks similar to this:   H-O-O-H    , with two unshared pairs on each of the oxygen. This may appear to be a linear shaped molecule, but after further research this is not the case. Hydrogen peroxide has two equivalent central atoms with two unshared pairs and two single bonds. This creates an angled bond, creating the bent shape of the molecule. Also, because the atoms do not all lie in the same plane, the dipoles do not cancel eachother out. So, hydrogen peroxide is a polar molecule..


 It appears as a colorless liquid and almost looks like water, but it is denser. The bond between the two oxygen atoms of the molecule is very weak, so the molecule can very easily break down, making it very reactive and powerful. It is used as a powerful bleaching agent and as a mild disinfectant. Hydrogen peroxide is very common around households because there are many uses for it. However, hydrogen peroxide bought by consumers usually only contains about 3% of hydrogen peroxide and the rest of the mixture is water, so it is not as dangerous. Hydrogen peroxide is usually sold in dark colored bottles so that the substance is not exposed to sunlight because the exposure to sun rays can easily break the bond between the two oxygen atoms in the molecule, leaving you with a bottle of water and oxygen gas.


Between two hydrogen peroxide molecules, there are three Forces of Attraction Present:
1) London Dispersion Forces - this force is present because electrons are constantly in motion, so 1 end of a polar molecule can be temporarily positive or temporarily negative; because of these temporary dipoles two  molecules can be attracted to eachother.
2) Dipole Forces- electrostatic attraction between the positive end of one molecule with the negative end of another.
3) Hydrogen Bonds- a temporary covalent bond that is formed between a hydrogen atom of one molecule and an oxygen, fluorine, or nitrogen of another.

7 comments:

  1. I really like the appearance of the blog. The backround looks great and fits the theme, also the font makes the advertisement look better than regular font.

    ReplyDelete
  2. The picture of the molecule is good because it is pretty self- explanatory, especially with the description, and accurate.

    ReplyDelete
  3. This comment has been removed by the author.

    ReplyDelete
  4. The statement where eric says that Hydrogen Peroxide is polar is correct. This molecule is polar because of its bent shape.

    ReplyDelete
  5. The three bonds that eric listed all are found between two H2O2 molecules. London Dispersion Forces occur because all molecules experience this, Dipole- Dipole occurs because it is polar, and Hydrogen bonding occurs because there is hydrogen and oxygen in Hydrogen peroxide molecules.

    ReplyDelete
  6. The advertisement for H2O2 was good and effective. It listed many uses for H2O2, and ones that would make me want to purchase it. When i use the last of the Hydrogen Peroxide that I have, i might just buy some more, for cleaning out cuts or whitening museum bones.

    ReplyDelete
  7. General Appearance
    I think the appearance of Eric's blog is really nice. The blue and black is a dynamic combination and grabs your attention. Also, the font at the top of the blog adds a nice affect and works well with the overall theme. The layout is easy to follow and it is well organized. He did a great job on the appearance.

    Picture of the Molecule
    The 3d model is a great visual and really assists in understanding what the molecule looks like. Perhaps labeling the hydrogen and oxygen atoms or providing a key would make it a bit easier to understand. However, it is a great representation and the arrows are drawn correctly.

    Polar or Nonpolar
    The statement that Eric said that the molecule is polar is correct. He also explained it nicely in reference to the dipoles. He could have went a bit more in depth about it, but otherwise it is well written.

    Intermolecular Forces
    The intermolecular forces described are correct. Also, Eric explained them superbly. He not only named the forces but also offered a definition of them which was very helpful.

    Advertisement
    The advertisement was very persuasive. I liked that it was at the top and a different font because it really grabbed your attention. It listed many useful purposes of hydrogen peroxide and included some everyday example.

    Eric did a great job on his project!

    ReplyDelete