Agenda and Homework for December 14

• Read chapter 9.3
  
  • do probs 22-25 pg 270
  • do probs 55, 57 pg 281

Final Exam on Thursday, Dec 16

Agenda and Homework for December 10

• Read chapter 9.2
  
  • do probs 10, 11 pg 263
  • do probs 52, 53 pg 281

Final Exam on Thursday, Dec 16

Agenda and Homework for December 8

1. stamp/review homework
2. chapter 7/8 quiz
3. chapter 8 homework quiz
4. homework
   
   1. read chapter 9.1 pp 253-259
   2. do probs 6-8 pg 258; probs 44-46 pg 281

Agenda and Homework for December 6

• Stamp/Review Homework
• Discussion of Chapter 8.4
  
  • Bond polarity
    
    • Electronegativity differences and bond types
    • representations of polartiy
      
      • lower case delta 
      • arrow
  • Polar Molecules
  • Attractions between molecules
    
    • van der Waals forces
      
      • dipole interactions
      • dispersion forces
    • hydrogen bonds
  • Attractions and Properties
    
    • melting points
      
      • network solids
  • Water dance
• QuickieQuiz 8.4
• Homework
  
• read chapter 8.4, pp 237-244
• do problems 35-37 pg 244; problems 57-61 pg 247

Coming Attractions:

• Wednesday, Dec 8:
  
  • Homework quiz
  • Chapter 7/8 quiz
  • Ionic identification lab
• Thursday, Dec 16:
  
  • Final Exam

Agenda and Homework for December 2, 2010

Do Now

• Stamp/Review Homework
• Discussion of Chapter 8.3
  
  • Molecular orbitals
    
    • Sigma, s
    • Pi, p
  • VSEPR Theory
  • Hybrid orbitals
    
    • sp³
    • sp²
    • sp
• Molecular Modeling activity
• QuickieQuiz 8.3
• Homework
  
  • read chapter 8.3, pp 230-236
  • do problems 26, 28, 29 pg 236; problems 55-56 pg 247

Agenda and Homework for November 30

• Do Now

• Stamp/Review Homework
• Finish Polar or Non-Polar lab
• Discussion of Chapter 8.2
  
  • Octet rule
  • Single covalent bonds
  • Double covalent bonds
  • Triple covalent bonds
  • Coordinate covalent bonds
  • Bond dissociation energies
  • Resonance
  • Exceptions to the Octet Rule
• Homework
  
  • read chapter 8.2, pp 217-229
  • do problems 14-18 pg 229; problems 42-46 pg 247

Agenda and Homework for November 24

• Stamp/Review Homework
• Homework quiz
• Polar or Non-Polar lab
• Homework (extra credit stamp on Tuesday!)
  
  • read chapter 8.1, pp 213-216
  • do problems 39-41 pg 247
• Extra credit (one point): take this quiz, and email it to mister.gould@gmail.com
• after you take quiz, there will be a form to submit, and place my email address into.

Iodine gas

Agenda and Homework for November 22

1. Homework stamp/discussion
2. Chapter 7.2 discussion
3. Homework
   
   1. Read chapter 7.3 pp 201-205
   2. do problems #26, 27, 29 pg 203; #48, 51, pg 208

Agenda and Homework for November 18

1. Do Now:
   
   1. Please consider this released STAR test question:
      
      1. When cations and anions join, they form what kind of chemical bond?
         
         A ionic
         
         B hydrogen
         
         C metallic
         
         D covalent
2. return quizzes
3. Homework stamp/discussion
4. Chapter 7.1 discussion
   
   1. electron dot structures
   2. pseudo noble gas configurations
   3. formation of anions
   4. formation of cations
5. Homework
   
   1. Read chapter 7.2 pp 194-199
   2. do problems #18, 20 pg 199; #42, 44, 45 pg 207

Agenda and Homework for November 16

1. Do Now:
   
   1. Please consider this released STAR test question:
      
      1. Which of the following atoms has the largest atomic radius?
         
         1. barium (Ba)
         2. chlorine (Cl)
         3. iodine (I)
         4. magnesium (Mg)
2. Homework stamp/discussion
3. Homework quiz
4. Chapter 6 discussion
5. Chapter 6 quiz
6. Homework
   
   1. Read chapter 7.1 pp 187-193
   2. do problems #4, 7, 8 pg 193; #31, 35 pg 207

Agenda and Homework for November 12

1. Do Now
   
   1. Which of the following atoms has six valence electrons?
      
      1. magnesium (Mg)
      2. silicon (Si)
      3. sulfur (S)
      4. argon (Ar)
2. Homework check
   
   1. Homework discussion
3. Chapter 6.2 review
   
   1. How to read the squares of the Periodic Table
   2. Electron configuration in groups
      
      1. noble gases
      2. representative elements
   3. Transistion elements
   4. Blocks of elements
4. Preview of chapter 6.3 Periodic Trends
   
   1. Trends in atomic size (pm)
   2. Ions
      
      1. cations
      2. anions
   3. Trends in ionization energy (kJ/mol)
   4. Trends in ionic size
   5. Trends in electronegativity
5. Homework
1. read chapter 6.3 pp 170-178
1. do problems 16, 20, 22, 23 pg 178
2. do problems 36, 38-42, 44, 45 pg 181
6. Upcoming quizzes
   
   1. Homework quiz on chapter 6 next class
   2. Chapter 6 quiz next class

Agenda and Homework for 11.9.2010

Dry Ice Lab

• Homework
  
  • Read Chapter 6.2 pp 161 - 169
    
    • do problems 12, 14, 15 pg 167
    • do problems 30, 32-35pg 181

Homework for 11.5.2010

Dmitri Mendeleev

• Read Chapter 6.1
  
  • pp 154 - 160
• do problems 5, 6, 7 pg 160
• do problems 24, 25, 28 pg 181

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

Agenda and Homework for September 21

Do Now:
Please consider this released STAR test question:

Generally, how do atomic masses vary throughout the periodic table of the elements?

1. They increase from left to right and top to bottom.
2. They increase from left to right and bottom to top.
3. They increase from right to left and top to bottom.
4. They increase from right to left and bottom to top.

Announcement:

There will be a Unit 1 Quiz on Thursday. The quiz will contain materials from Chapters 1-4, as well as any other topics covered in class, such as questions from Einstein's Big Idea.

Agenda

1. Do Now
2. Review of Homework quiz
3. Review of density cube activity
4. Discussion of online grade posting
5. Homework review

Homework

p. 97 #79, 82, 84, 87, 90.

Homework for 9-17-2010

Galileo Thermometer

Do Now
Please consider this released STAR test question:

Why is cobalt (Co) placed before nickel (Ni) on the periodic table of the elements even though it has a higher average atomic mass than nickel?

1. Nickel has one more proton
2. Cobalt was discovered first.
   
3. Nickel has fewer electrons.
   
4. Cobalt has a lower density.
   

Agenda for 9-17 

1. 1. 1. Do Now
      2. Quickie Quiz discussion
      3. Safety Quiz results 
      4. Homework review 
      5. Homework quiz (open notes)
      6. Head start on weekend homework (time permitting)

1. 
   
   
   

   
   
   
   

   Homework assignment
   pg 96, #58, 59, 62, 65,  66, 70, 72
   

   
   
   
   

   Please do the following problems off of this worksheet:
   
   
   1. Why are numbers used in chemistry often expressed in scientific notation?

   
   

   2. Circle the letter of each sentence that is true about numbers expressed in

   scientific notation.

   • a.   A number expressed in scientific notation is written as the product of a coefficient and a power of 10.
   • b.   The power of 10 is called the exponent.
   • c.   The coefficient is always a number greater than or equal to one and less than ten.
   • d.   For numbers less than one, the exponent is positive.

   
   
   

   3. Circle the letter of the answer in which 503,000,000 is written correctly in

   scientific notation.

   • a. 5.03  10^–7
   • b. 503  10⁶
   • c. 5.03  10⁸
   • d. 503 million

   
   
   

   Accuracy, Precision, and Error (pages 64–65)

   4. Is the following sentence true or false? To decide whether a measurement has

   good precision or poor precision, the measurement must be made more than

   once. ______________________