Final Review

All: The review session will take place on Monday at 1:30pm in room 3K3.  I know you only have a morning test, so please use the down time between to eat, study (maybe organize a study group in the library), organize your questions, etc.
Please try to arrive 5-10 minutes early so we can get organized and start working on content at 1:30.
If you have any questions before Monday, please feel free to email me.

Tuesday, June 5

All: Here is the teacher evaluation. If you plan to fill it out, please do so by the end of the week. Many thanks!
http://www.quia.com/sv/582146.html

Monday, June 4

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All Sections: Follow all instructions carefully. Below you will find some information on half-life; look it over. When you are done, complete the worksheet on half-life, which can be found in the 'Homework' section (the answer to number one is 1.125 grams).

-HALF-LIFE is the time that it takes for 1/2 a sample to decompose.

-The rate of a nuclear transformation depends only on the “reactant” concentration.

Here's a graph of the half-life of the Oxygen-15 isotope:

For each duration (half-life), one half of the substance decomposes.

For example: Ra-234 has a half-life of 3.6 days. If you start with 50 grams of Ra-234 after 3.6 days you will have 25 grams left. After 7.2 days, 12.5 grams and after 10.8 days, 6.25 grams, and so on.

Here's another sample problem and answer:

Q: The half life of I-123 is 13 hr. How much of a 64 mg sample of I-123 is left after 39 hours?

A: 39/13 = 3...1 half life, 64 > 32. 2nd half life, 32 >16. 3rd half life 16 > 8mg

For Monday, June 4

All Sections: There are two parts to your HW for Monday.
1) Under the 'Homework' section you will find a document that you should print out and complete for your next class - I will be collecting it.
2) There is a powerpoint at the bottom of this page. Make sure you have notes up to slide 17 in your notebook (some of you may already have the first few slides).

Hanno un buon weekend i miei studenti bravi!!