Chemistry 12-1-11 Structure of the Atom

CHEMISTRY: Great job on using experimental results to form a conclusion! Here’s the lecture from Thursday on the discovery of electrons, the nucleus, and neutrons. Lots of stuff to learn, but make sure you just don’t learn facts – be able to apply the concepts.

Check out the videos in the VodPod collection below. You can find the cathode ray tube experiment, Rutherford’s gold foil experiment, and others. Be able to explain not only what they did in their experiments, but how Thompson and Rutherford used the experimental results to discover the electron, nucleus and protons. Cookie dough, yum! πŸ™‚


flickr photo by pixxiestails

Physics 12-1-11 Work-Energy Problems

PHYSICS – Happy first day of December! Great work on the problems today! I think it was a good idea for us to regroup and make sure you had the work-energy theorem down before we move on to the last part of the chapter tomorrow. Are you still trying to follow formulas, or are you starting to be able to think through the problems and and begin to make connections?

Be careful – don’t just start grabbing formulas and throwing in numbers. Make sure the formulas make sense – ask yourself every time why it makes sense for you to put that particular number in that particular part of the formula. And work them over and over and over until it comes naturally to you!

This means that the homework for tonight is changed. You have one final review worksheet that will be due next Tuesday. I scanned and linked a copy for you here – it’s two pages. Start with the questions and problems that are circled – I may add more to the list later. Chapter 5 Review Worksheet 2


flickr photo by -BeNnO-

Hon Chemistry 12-1-11 Radioactive Decay

HON CHEMISTRY: Can you guess what it is?/ It’s a picture of uranium ore under UV light. Cool, huh! Here’s the lecture from Thursday on the properties of radioactive nuclides and the types of radioactive decay. It also includes how to write nuclear equations. Don’t forget to memorize the nuclear symbols for alpha particles, beta particles (electrons), positrons, neutrons, and protons. Not nearly as bad as polyatomic ions, huh?!? πŸ™‚

I thought you might want to get a head start on the half-life simulation lab, so I posted about that earlier. I’m including a copy of the Half-Life Simulation Lab here, but make sure you go back and read that post for detail that you will need. And speaking of half-life, let’s calculate it tomorrow. Calculators ready!