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# Power Notes Bohr Models- day 2

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### Power Notes Bohr Models- day 2

1. 1. Today in Science You will Need: 1)Pencil/Pen, Colored Pencils, Highlighters or Markers; Periodic Table – Pgs. 196-197 2)Power Notes – Bohr Model Drawings + Density Review– 1 pages 2 sides – Bookshelf = This is Part 2 3)Any missing work you owe
2. 2. Reminders 1. End of the Quarter is Friday, May 28th 2. Binder Check #2 – Due Tomorrow at the beginning of class 3. Minimum Days Today and Thursday of this week– 12:07 Dismissal – Schedule on Front board. 4. Power Notes- Bohr Model Drawings Review and Reflect on Page One Only – Due FRIDAY.
3. 3. Bohr Model of Carbon Atomic # = Protons “+” and Electrons “-” if neutral Atomic Mass = Sum of Protons and Neutrons
4. 4. Lewis Dot Diagrams Example: Beryllium is in Family #2 1. Illustrated using elements Chemical Symbol and DOTS to represent its’ VALENCE electrons. 2. Beryllium has a VALENCE of 2 Be 1 2 3 4 5 6 7 8
5. 5. Let’s try a couple: Lithium Row= Protons = Neutrons = Electrons = Lewis Dot 2 3+ 7-3=4 3- P = 3+ N = 4 2- 1- Li
6. 6. Let’s try a couple: Magnesium Row= Protons = Neutrons = Electrons = Lewis Dot 3 12 + 24- 12=1212- P = 12+ N = 12 2- 8- Mg 2-
7. 7. Let’s try a couple: Oxygen Row= Protons = Neutrons = Electrons = Lewis Dot 2 8+ 16-8=8 8- P = 8+ N = 8 2- 6- O
8. 8. Practice and Review Mass Unit Label = ___________ Volume Unit Label = _______, ________, ________ Density Unit Label = __________, __________, __________ Gram cm3 mL cc g/cm3 g/mL g/cc
9. 9. Density Formulas 1)There are 3 versions of the Density formula: D=m/v v= m/D m= v x D
10. 10. Density Formulas 1)Identify the type of numbers you are given in the word problem. 2)Choose the correct version of the Density formula 1)Tip: If you are given the mass you will always DIVIDE 3)You may need to find VOLUME first! (2 step problems)
11. 11. Task List & Homework 1)Binder Check #2- Due Tomorrow at the beginning of class 2)Review and Reflect on Page one of Power Notes – Bohr Model Drawings ONLY 3)Bohr Model & Lewis Dot Diagrams + Density Review – Due Friday.
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