[avocadocontest]

Greetings everybody. I'm preparing for the avogadro contest and have a bunch of questions that I'm going to eventually post over time.

First Question:
The professor in a youtube vid I watched explains that acidity increases as you go right and down on the table.
But the intramolecular bonds between HA increases from left to right due to electronegativity so shouldn't it be more difficult to break those bonds as you move right?

Also, it makes sense to me, in terms of electronegativity, that an acid ionize more as you go down the table, but the professor says that the vertical trend is due to polarizability... which I don't understand.
http://www.youtube.com/watch?v=4h2O0mtpL5Q&feature=relmfu

[avocadocontest]

Second Question:
I would like to clarify a few things the boiling point of group 14,15,16,17 hydrides.
I went on this link: http://cnx.org/content/m12450/latest/ under the subtitle "Observation 3: Boiling Points of simple hydrides"
and I think this is what they're trying to say:

-as you go right on the table, the electronegativity dif between hydrogen and the element in question increases, making the element have more polar intermolecular bonds, and thus making it harder to boil. This explains why group 15 hydrides have higher boiling points than group 14 hydrides.

-as you go down on the table, the intermolecular forces decrease, which should result in a lower melting point, but this is offset by the increase in LDF forces as the molecule gets heavier. Thus boiling point increases going down the table.

Am I right?
Also, if boiling points increase going left to right then why is the boiling point of group 16 higher than that of group 17?

[avocadocontest]

Greetings everybody. I'm preparing for the avogadro contest and have a bunch of questions that I'm going to eventually post over time.

First Question:
The professor in a youtube vid I watched explains that acidity increases as you go right and down on the table.
But the intramolecular bonds between HA increases from left to right due to electronegativity so shouldn't it be more difficult to break those bonds as you move right?

Also, it makes sense to me, in terms of electronegativity, that an acid ionize more as you go down the table, but the professor says that the vertical trend is due to polarizability... which I don't understand.
http://www.youtube.com/watch?v=4h2O0mtpL5Q&feature=relmfu

Nvm I found the answer