1. September 16, 2013
When the bell rings voices are at zero, working on the DO NOW ( All electronics away!!)
Pick up daily handouts
Turn in – M&Ms Lab Report Due Today (LATE Beanium ClEvR, LATE Anticipation guides, Lab safety contracts)
Start on the Do Now in your Do Now form ( flip over your’s from last week)
DO NOW 9/16/13
The half-life of Zn-71 is 2.4 minutes. If one had g at the beginning, how many grams would be left after 7.2 minutes has elapsed?
WHEN YOU FINISH YOUR DO NOW TAKE EVERYTHING YOU WILL NEED OUT OF YOUR BACKPACK AND PUT AT ENTRANCE

2. Do Now Review
DO NOW 9/16/13
The half-life of Zn-71 is 2.4 minutes. If one had g at the beginning, how many grams would be left after 7.2 minutes has elapsed?
7.2 / 2.4 = 3 half-lives
(1/2)3 = (the amount remaining after 3 half-lives)
100.0 g x = 12.5 g remaining

3. Homework
Lab Report for Chemistry in a bag Due Friday 9/20/2013 ** ( Cover Letter, Introduction, and Hypothesis) Bohr Model Article and Questions Due Tomorrow Tuesday 9/21/2013 Grading Policy***

4. Upcoming Dates 9/18/2013 Wednesday Nuclear Chemistry Test
9/20/2013 Mole Conversion test
9/20/2013 Chemistry in a bag report due

5. Tutoring
Tuesday 2:30-3:30 in room 529
Thursday 2:30-3:30 in room 710

6. Nuclear Chemistry
Bravo – 15,000 kilotons

7. Nuclear Symbols Element Mass number symbol (p+ + no) Atomic number
(number of p+)

8. Types of Radioactive Decay
alpha production (a, He): helium nucleus
beta production (b, e):
gamma ray production (g):

9. Nuclear Stability
Decay will occur in such a way as to return a nucleus to the band (line) of stability.

10. Alpha Radiation
Alpha decay is limited to VERY large, nuclei such as those in heavy metals.

11. Beta Radiation
Beta decay converts a neutron into a proton.

12. Alpha Particle Emission Beta Particle Emission
Gamma Ray Emission
Symbol or
Mass
Heavy
Light
No Mass
How it changes the nucleus
Decreases the mass number by 4
Decreases the atomic number by 2
Converts a neutron into a proton
Increases atomic number by 1
No change to the nucleus
Penetration
Low
Medium
High
Protection provided by…
Skin
Paper, clothing
Lead
Danger

13. Practice!
Alpha decay or iridium-174 Beta decay of platinum-199 Krypton-76 undergoes electron capture

14. Chemistry in a Bag! Kevin, Victoria, Breion
Alexis, Nalexus, Hunter, Linda
Atianna, Sydney, Yusef, Deja
Miranda, Jordan H, Simone, Jordan L
Kalen, Andre, Jaylen, Bryanna

15. Chemistry in a Bag! Jon, Jaquis, Cameron Darryl, Leon, Chris
Treyeln, Kirkland, Angel
Dorian, Mandrez, Garrett

16. Chemistry in a Bag! Farrukh, Malik B, Yin, Miles
Alexis, Malik S, Jonathan
Brianna D, Kris, Andrea
Sydney, Quand’Arius, Brionna R
Beni, Bryt’Tani, Qualaizuyia
Shawn, Tavon, Daenejia