Wednesday, December 7, 2011

1.3: Awesome Practice Problems for Finding Protons, Neutrons, and Electrons

Check out these awesome practice problems on finding the number of protons, neutrons, and electrons for atoms and ions in this tutorial!

http://chemistry.csudh.edu/lechelpcs/protonscsn7.html

Thursday, December 1, 2011

3.2: Another Cathode Ray Tube

Here's another great one on the Cathode Ray Tube. This one shows how it responds in the presence of a magnet. Cool!

3.2: JJ Thomson and the Cathode Ray Tube

This guys voice is far from enthusiastic, but the information is really good. Just try not to be lulled to sleep by his voice.

3.2: Rutherford's Gold Foil Experiment Video

Wednesday, October 5, 2011

ADV 1.3: Calculating Limiting and Excess Reactant Video

This is a different look at the LR and ER problems we've been doing. He takes a different approach to finding the limiting reactant. I personally like my way better to doing that (hmmm...) because I think that it's much less complicated. But it's interesting, and good practice for finding how much of the excess reactant is left over -- something all of you could use a little extra practice with. :)

Tuesday, October 4, 2011

ADV 0.3: Practice Problem

Liquid Nitrogen KABOOM


Liquid Nitrogen boils at -192 degrees Celsius.  When it boils inside of a 2 liter pop bottle, it expands rapidly and the gas creates so much pressure on the bottle that it explodes into a million pieces:

Liquid Nitrogen Graham Crackers

Liquid Nitrogen enters into a graham cracker's pores.  When you pull it out of the liquid nitrogen, it boils as soon as it comes into contact with the air.  It uses the heat energy from the graham cracker to do this, making the cracker VERY cold.  It gets so cold, in fact, that when you eat one, your breath condenses as water vapor, making it look like you are breathing smoke!