Category Archives: AP Chemistry

Before class on Tues., Jan 3

Before class on Tuesday, Jan. 3:

  • Please watch the 8 videos below (in total 90 min).  These videos follow the notes I handed out in class;
  • Complete the multiple choice and free response questions in the gas packet I handed out to you.

If you have questions on this material, please email me at suzanne.irwin@lcps.org or send me a remind text.  We will be practicing gas problems and discussiong how the structure of molecules affects the properties of solids, liquids, solutions and gases  on our first day back.  We will start our next unit, on Kinetics, on Jan. 5 .  You will have a  unit test/quiz on Solids, Liquids, Solutions, Gases and their properties on Monday, Jan. 9.

Gas Laws Part 2: Pressure and Volume

Gas Laws: Charles, Combined, Avogadro’s

How to use ideal gas law with density problem (this is the 4th video, even though is says Gases part 5):

How to use ideal gas law to find the molar mass of a gas:

Using the ideal gas law with stoichiometry problems to find out how much of something you have:

Partial Pressures and Effusion and Diffusion

How real gases differ from “ideal gases”

Before Class on November 28: Lattice Energy, Bonding, and Electronegativity

Before class on Nov. 28, please watch the following videos. I did not make these videos, but I think the instructor uses computer animation and analogies in a way that is very helpful.  There are 6 videos, and each video is 4 minutes or less, so you have in total between 22 and 24 minutes of videos.

These videos define lattice energy as the energy required to break apart an ionic formula into separate, infinitely spaced gaseous ions.  WE  are defining lattice energy in the OPPOSITE way– as the energy released when two gaseous ions come together.  So our lattice energies will be exothermic, or negative.  However, everything else about thee videos applies.

Also, here is the answer key for the

Lattice Energy Worksheet.  Be prepared to discuss on Monday.