Life long sharing . . .

Chemistry – Polarity

Posted on: October 26, 2016

I must say what a brilliant idea to explain this using boy bands. And have a good laugh when he equates Bromine, Chlorine, Florine, Oxygen and Nitrogen to One Direction when explaining the Electronegativity.

electronegativity

Still, it’s very fast, and packed with information. But, hey, it’s a crash course, so …

Additional note on ice and liquid water:

Why does ice float?

What other observations or facts are known?

  • Because ice floats, we can infer that ice must be less dense than water.
  • If water is frozen in a glass jar, the glass jar breaks.
  • If a pop can freezes, it will also burst.
  • From both of the above we infer that the volume of the ice has increased.

Conclusion: The volume of ice must be greater than the same mass of liquid water. Why does the volume increase?

In liquid water, each molecule is hydrogen bonded to approximately 3.4 other water molecules. In ice, each molecule is hydrogen bonded to 4 other molecules. So ice forms more hydrogen bonds than liquid water. This difference in hydrogen bonding increases the space between each water molecule, thus increasing the volume of ice. Hence ice is less dense than liquid water. This also means ice floats on water.

ice

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

Archives

October 2016
M T W T F S S
« Sep   Nov »
 12
3456789
10111213141516
17181920212223
24252627282930
31  

Enter your email address to subscribe to this blog and receive notifications of new posts by email.

Join 181 other followers

%d bloggers like this: