September 16 2013 When the bell rings voices

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 Cl. Ev. R, 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 100. 0 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

Do Now Review DO NOW 9/16/13 The half-life of Zn-71 is 2. 4 minutes. If one had 100. 0 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 = 0. 125 (the amount remaining after 3 half-lives) 100. 0 g x 0. 125 = 12. 5 g remaining

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***

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

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

Nuclear Chemistry Bravo – 15, 000 kilotons

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

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

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

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

Beta Radiation Beta decay converts a neutron into a proton.

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

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

Chemistry in a Bag! 1. Kevin, Victoria, Breion 2. Alexis, Nalexus, Hunter, Linda 3. Atianna, Sydney, Yusef, Deja 4. Miranda, Jordan H, Simone, Jordan L 5. Kalen, Andre, Jaylen, Bryanna

Chemistry in a Bag! 1. Jon, Jaquis, Cameron 2. Darryl, Leon, Chris 3. Treyeln, Kirkland, Angel 4. Dorian, Mandrez, Garrett

Chemistry in a Bag! 1. Farrukh, Malik B, Yin, Miles 2. Alexis, Malik S, Jonathan 3. Brianna D, Kris, Andrea 4. Sydney, Quand’Arius, Brionna R 5. Beni, Bryt’Tani, Qualaizuyia 6. Shawn, Tavon, Daenejia