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3/31/14 Stds: 4 (Gases and their Properties) OBJECTIVES: • Introduce Ch 13 Gas Laws DO NOW: a. Ch 13.1 (gases) Cornell Notes p. 384387 (1 paper, 1 full side min) (5 pts) EVERYONE WORKS INDEPENDENTLY (3 pts) Std 4 b. p. 388 Ch 13.1 #'s 1, 2, & 3 (2 pts) Std 4 ALL CW DUE END OF PERIOD (5 pts) Std 4 HOMEWORK: a. NONE ======BASKET: a. NONE
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Put out lots of laptops to use for finding defs for effusion & diffusion. Have students find defs on web and then compare & contrast diffusion and effusion tomorrow, Tu, April 1, 2014.
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4/1/14 Stds: 4 (Gases and their Properties) OBJECTIVES: • Be able to calculate problems involving Graham's Law of Effusion. (effusion & diffusion are very similar) DO NOW: a. Using your phone, or one of the computers set out around the room, define effusion & diffusion and compare and contrast them. b. Give an example of one substance a gas could effuse through, and tell why it could. HOMEWORK: a. App A, Ch 13.1 p. 878 1 & 2 (Answers: 1 1.32:1; 2 58 g/mol) b. Ch 13 Assess p. 415 6264 (Answers: 62 36.0 g/mol; 63 RKr / RNe = 0.493; 64 3.56 g/mol) c. ChemThink Behavior of Gases Tutorial w Cornell Notes (1 side 1 piece of paper) (due Th) (5 pts), & Q's (10 pts), due Fri 4/4 Std 4 ======BASKET: a. NONE
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App A, Ch 13.1 p. 878 1 & 2
Ch 13 Assess p. 415 6264
Want help on this and/or the ChemThink assignment? See tonight's HW page (4/1/14) and look for link in HW section.
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diffusion gas particles moving from area of higher concentration to area of lower concentration effusion gas particles diffusing through small opening from higher concentration to lower concentration.
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"Charges and Specs" Season Finale episode of BROOKLYN NINE-NINE aired Tuesday, March 25 (9:3010:00 PM ET/PT) on
FOX http://www.glamour.com/entertainment/blogs/obsessed/2013/11/terrycrewsbrooklyn99.html Terry Cruz Article about how great he is http://www.youtube.com/watch?v=wzFMd9QoAJQ Superbowl Ad
"Never commit suicide. Today may look awful, but things change every day. You may be down now, but tomorrow everything could turn around and wind up being the best day ever."
Quote from Terry Cruz, star in Brooklyn Nine Nine a man who has known hard times Terry Cruz says,
so does the Bible
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Love is in the air, everyone is "bouncing off the walls", just like gas molecules
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Gas simulator for extra credit assignment (30 points possible) http://intro.chem.okstate.edu/1314F00/Laboratory/GLP.htm Take a look at other gas simulators:
Gas sim demonstrates effusion http://group.chem.iastate.edu/Greenbowe/sections/projectfolder/flashfiles/gaslaw/effusion2.html
Gas sim demonstrates diffusion http://lsvr12.kantifrauenfeld.ch/KOJ/Java/Diffusion.html
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Turn to page 387 to see this equality (ratios of effusion rates) INVERSE
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?
?
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Typical problems using formula (this slide and next) Similar to #1 & 2 on p. 388
Given Find What is the ratio of effusion for Cl molar mass Cl = 70 2 2 Cl2 and F2. F2 molar mass F2 = 38
Note: 4 variables Rate 38 g/mol A = = = 0.785 in equality, 0.574 RateB 70 g/mol you will always be given 3 of them and be asked to solve for the 4th.
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Similar to problem 3 on p. 388
Given Find
Molar mass of A = 2.5 g/mol What is the molar mass of B? Rate of effusion of B = 3 times that of A
Note: 4 variables in equality, you will always be given 3 of them and be asked to solve for the 4th.
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4/2/2014 Standards: 4 (Gases and their Properties) OBJECTIVES: ● Students will be able to understand Graham's Law of Effusion and apply to results in their minilab. DO NOW: a. Read lab sheet (today's handout) silently, to yourself. b. MiniLab "Mass vs Velocity of Molecules" will be due Thursday (10 pts) Std 4 HOMEWORK: a. ChemThink.com Cornell Notes on Tutorial for Behavior of Gases due tomorrow (turn it in). 1 side of 1 piece of paper minimum. Be sure to get all 4 variables used to calculate Gas Law Problems. (5 pts) Std 4 ======BASKET (stamped): a. App A, Ch 13.1 p. 878 1 & 2 (2 pts) Std 4 b. Ch 13 Assess p. 415 6264 (3 pts) Std 4
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EVALUATION OF PROBLEM CALCULATION
EVALUATION OF PROBLEM
CALCULATION
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If your computer is not on the CD's home screen, do this: Click "Start" button Click Programs Click "Introductory Chemistry" Click "Introductory Chemistry 4.0 (has molecule logo)
That will start the program on the CD, and allow you to use your lab sheet directions to get to the Exercises we will be doing.
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On the back of your papers you will be showing your relative rates that are calculated by Graham's Law: In question 7 you are using actual counts you see on the computer simulations. (left side)
In question 8 your are calculating the relative rates based on the molar masses of the molecules.
You are to calculate the % error for your calculations.
You are comparing the relative rate you get with the molar mass and comparing it to the rate you get by your counts.
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actual
theoretical
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Percent Error of relative rate of
effusion of Cl2 to H2 and CH4 to N2
theoretical (calculated) actual (your counts) x 100 = % error theoretical (calculated)
theo right side of last screen (question 8 on lab sheet)
actual what you actually counted(question 7 on lab sheet)
Cl once for 2 H2
once for CH4 2X N2
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4/3/2014 Standards: 4 (Gases and their Properties) OBJECTIVES: ● Students will be able explain and understand KMT ● Students will be able to understand relationship of temp & speed and molar mass and speed DO NOW: a. Define Kinetic Molecular Theory using Zum Text p 400. HOMEWORK: a. ChemThink.com Questions due tomorrow before midnight. b. Ch 13.1 p. 388 (Gas Pressure) 391 Cornell Notes (1 full page, one side of paper) (2 pts) Std 4 c. Ch 13.1 p. 392 #46 (3 pts) Std 4 ======BASKET (stamped): a. ChemThink.com Cornell Notes on Tutorial for Behavior of Gases due tomorrow (turn it in). 1 side of 1 piece of paper minimum. Be sure to get all 4 variables used to calculate Gas Law Problems. (5 pts) Std 4 Black Tray: a. Lab Mass vs Velocity of Molecules
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Define Kinetic Molecular Theory then answer these questions. (Use Zum Text p. 400401)
1. What are the assumptions regarding
a. size of particles
b. particles how do they travel?
c. What is assumed about what happens when they collide?
2. Define Kinetic energy including its formula KE = 1 mv2 2 3. How do we measure the average Kinetic energy of molecules?
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KMT To get animation: 1st go to www.mrwiggersci.com/chem 2nd follow this path: “Learning Center” > “Web Helps” > Ch 13 > Look for KMT in the top left of screen Click on “Visit Site”
Show online what they will see (map)
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Link to Glenco animation showing heat transfer and Kinetic Molecular Theory (KMT)
http://www.classzone.com/cz/books/woc_07/resources/htmls/ani_chem/chem_flash/ popup.html?layer=act&src=qtiwf_act039.1.xml
1. After watching animation, answer questions on next 3 screens.
2. Summarize what you learned about the KMT from watching this animation and answering the questions?
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ChemThink.com Behavior of Gases Tutorial
1. What is the relationship between speed and temperature? Symbol T = temp in K
Speed vs T direct or inverse ?
2. What is the relationship between speed and molar mass of the molecule?
Speed vs molar mass direct or inverse ?
3. Why aren't all molecules in a gas sample traveling at the same speed?
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4/4/2014 Standards: 4 (Gases and their Properties) OBJECTIVES: ● Be able to use the combined gas law to solve Boyle & Charles Law Problems DO NOW: a. Pick up papers on side of room. HOMEWORK: a. Zum p. 408 17 (ac), 19, (ac), 21 show all calculations doing unit cancellation and showing all units of measure (5 pts) Std 4 b. Watch video "Ideal Island" & take notes (1 page, one side only) (5 pts) ======BASKET (stamped): a. Ch 13.1 p. 388 (Gas Pressure) 391 Cornell Notes (1 full page, one side of paper) (2 pts) Std 4 b. Ch 13.1 p. 392 #46 (3 pts) Std 4
REMINDER ChemThink.com Behavior of Gases Questions due tonight at midnight.
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Ideal Gases all gases are closer to ideal when T and P are:
are at a higher temperature T
are at a lower pressure P
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Gas laws have only 4 variables
P = pressure
V = volume
n = moles
T = temperature must always be in K
and only 1 constant R = 0.0821
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Examples of how to do conversions of units of measure: Zum p 408
1 atm = 760 mmHg = 760 Torr = 101.3 kPa = 101,325 Pa = 14.7 psi = UNITS OF PRESSURE
7a Convert to atmospheres 657 mmHg x 1 atm = 0.864 atm 1 760 mmHg
9a Convert to mmHg
760 mmHg 1.045 atm x = 794.2 mmHg 1 1 atm
12a Convert to kPa 2.07 x 106 Pa 1 kPa x = 2.07 x 103 kPa 1 1000 Pa
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Using today's handout, do the stated conversions using unit cancellation (Zum text):
Page 408 7, 9, & 12
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Combined Gas Law WHEN ONE OR MORE VARIABLES CHANGE P1V1 P2V2 = n1T1 n2T2
Ideal Gas Law
constant PV = nRT R = 0.08206
P must be in atm V must be in L NONE OF THE n must be moles VARIABLES CHANGE T must be K
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Using Combined Gas Law to find unknown P V P V 1 1 = 2 2 n1T1 n2T2
Zum p. 408 17 (ac), 19, (ac), 21
17a V = 53.2mL , P = 785 mmHg, V = ?, P = 700 mmHg
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ANSWERS Zum p. 408 17a 59.7 mL 17, 19, 21 17b 1.18 atm 17c 3.40 L
19a 197 kPa 19b 25.5 mL 19c 48.6 L
21 479 mL
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Extra Credit 30 POINTS Opportunity POSSIBLE
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Extra Credit Opportunity
Bring up to 2 boxes of Kleenex. 5 pts ex cr for each.
Requirements:
1. Must be largest boxes available 2. Must be 3 ply
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