Agenda for Oct 28, 2010

Do Now

Fe₂O₃ + 3CO --> 2Fe + 3CO₂

• In this reaction, how many grams of Fe₂O₃ are required to completely react with 84 grams of CO?
  
  1. 64 g
  2. 80 g
  3. 160 g
  4. 1400 g

Mole Problem

Using your knowledge of mole calculations and unit conversions, determine how many atoms there are in 1 gallon of gasoline. Assume that the molecular formula for gasoline is C₆H₁₄ and that the density of gasoline is approximately 0.85 g/mL [note: there are 3785 mL in one gallon.]

Mole Worksheet

• Work in groups on these problems. These can show up on quizzes.

Discussion of Chapter 10.3

• definitions
• understanding formulas

Homework

• read pp 305 - 313
• do problems #43,44 on pg 312; #63, 64 on pg 314

Agenda for Oct 26, 2010

1. Do Now
   
   1. How many atoms are contained in 97.6 g of platinum (Pt)?
      
      1. 5.16 × 10³⁰
      2. 3.01 × 10²³
      3. 1.20×10²⁴
      4. 1.10×10²⁸
2. Turn in moles of chalk worksheet
3. Homework Stamp/Review
4. Moleday 2010
   
   1. moleday.org website
   2. Mole Day Parade (last year's picture)
5. Homework
   
1. read pp 297-304
   pg 303, #26-29; pg 315, #58-60

Agenda for Oct 22, 2010

Mole Day is Coming!

Essential Concept:
The mole is a number: 6.02 x 10²³. A mole of carbon-12 by definition is equal to exactly 12.00 grams.

1. Do Now:
   
   1. How many moles of carbon-12 are contained in exactly 6 grams of carbon-12?
      
      1. 0.5 mole
      2. 2.0 moles
      3. 3.01×10²³ moles
      4. 6.02×10²³ moles
2. Homework Stamp
3. Homework review
4. Homework Quiz
5. Finish Flame test lab
   writeup
   
   1. coin toss to select group report
6. how many moles of chalk does it take to write your name?
7. Homework
   
1. read pp 287-296
2. pg 296, #13-15; pg 315,  #48-53

Agenda for Oct 20, 2010

1. Do Now:
   
   1. Write the electron configuration of Cs (atomic number 55)
2. Homework Stamp
3. Homework review
4. Gas-filled tube demo
5. Flame test lab
   
   1. instructions
   2. pre-lab questions
   3. cleanup
   4. post-lab questions
6. Homework
   
1. pg 151, #68-70, 74, 76
2. Homework quiz on Friday

Agenda for Oct 18, 2010

1. Do Now
2. Introduction to web site:
   
   1. Main class site: chemistry.ggould.com
   2. Sign up for mailing list
   3. Careers in chemistry project
3. Online access to the textbook
   
   1. Read Chapter 5 Section 2
      
      1. Answer questions on a Word doc
         
         1. drop in Mr. Gould's drop box at end of class
4. Read Balmer Series article in Wikipedia
   
   1. skip Balmer's Formula section
   2. Answer these questions on Word doc you started for Chapter 5 sec 2 questions:
      
      1. What year did Balmer discover the equation?
      2. What principal energy level does the electron drop down to in the Balmer series?
      3. In what area of the electromagnetic spectrum are most of the Balmer series lines?
      4. Why is are these lines important in astronomy?
5. Hydrogen spectrum animation
   
   1. Questions:
      
      1. What area of the spectrum does the Lyman series occur in?
         
         1. What principle energy level do the electrons drop down to in the Lyman series?
      2. What area of the spectrum does the Paschen series occur in?
         
         1. What principle energy level do the electrons drop down to in the Paschen series?
6. Take online quiz on electrons in atoms
   
   1. send to mister.gould@gmail.com
7. Deposit the Word doc, with your name in the title, in Mr. Gould's drop box.
   
   1. Alternate choice: email doc to mister.gould@gmail.com
8. Homework (due Wednesday at beginning of class):
   
   1. pg 149, #47-49; pg 150, #50-52,55,58,61-64.

Homework and Study Notes for 10.14.10

Homework:

• pg 149 #27-35, 38, 40-44
• Homework will be stamped at beginning of class

3rd Period Notes:

• Waves are energy
• Definition of frequency, ν
• E = hν (h is Planck’s constant)
• Wavelength, λ, is inversely proportional to E
• c = λν,
  c is velocity of light, 3.00 x 10⁸ m/s, celeritas
• when an excited electron returns to ‘ground state’ it emits a photon (hν)
• Einstein won Nobel Prize for photoelectric effect
• Fluorescence is when an excited electron returns to a lower energy level than it was excited to.
  
  • Emits a photon of lower energy than initial absorbed energy.
• Emission spectrum (emission spectrum of Fe shown below)

5th Period Notes:

• λ is the symbol for wavelength,
  
  • the distance from peak-to-peak
• Energy is directly proportional to frequency, ν
• E = hν, where h is Planck’s constant
• E is inversely proportion to λ
• Light has duality
  
  • can be either a wave or a particle (photon)
• Green has a higher frequency than red
• Fluorescence is when an excited electron returns to the ground state, and emits a photon of lower (usually) energy than the photon that originally excited the electron.
• Einstein won his Nobel Prize for the photoelectric effect.
• c = λν, where c = 3.00 x 108 m/s (celeritas!).
• Using this info, we could calculate the wavelength of your favorite radio station!
• When an excited electron comes down to a lower energy state, it emits a photon (hν).
• The farther away from the nucleus, the higher the energy of an electron.
• Dmitri Mendeleev created the Periodic Table