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3/5/2012 Standards: 4 Properties of Gases Objectives: ● Be able to calculate KE and Rate of Effusion ● Expose students to gas simulators (3) and students.

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Presentation on theme: "3/5/2012 Standards: 4 Properties of Gases Objectives: ● Be able to calculate KE and Rate of Effusion ● Expose students to gas simulators (3) and students."— Presentation transcript:

1 3/5/2012 Standards: 4 Properties of Gases Objectives: ● Be able to calculate KE and Rate of Effusion ● Expose students to gas simulators (3) and students will understand that pressure, temperature, and size of chamber (volume) are all inter-related. DO NOW: 1. Define all vocabulary terms given on page 385, East side defines 1 st 5 first, West side of room defines last 5 first (starts w pressure). HOMEWORK: 1. Ch 13.1 PP's, p. 388 1-3 App A Ch 13.1 p. 878 1 & 2 Ch 13 Assess, p. 415 62 - 64 (5 pts total for all 3) Std 4 ======================================================== BASKET: Journal 3/1 (day before quiz) SN Ch 13.1,States of Matter, p. 171-174 (5 pts) Std 4

2 temp = average kinetic energy (energy of motion) of particles Pascal = 1N/m 2 (N is abbreviation for newton which is a measure of force)

3 KMT To get video: 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”

4 http://intro.c hem.okstate.edu/1314F0 0/Laboratory /GLP.htm Gas simulator for extra credit assignment (30 points possible) Take a look at other gas simulators: http://group.chem.ias tate.edu/Greenbowe/ sections/projectfolder /flashfiles/gaslaw/effu sion2.html Gas sim demonstrates effusion Gas sim demonstrates diffusion http://lsvr12. kanti- frauenfeld.c h/KOJ/Java/ Diffusion.ht ml

5 Turn to page 387 to see this equality (ratios of effusion rates)

6 Note: 4 variables in equality, you will always be given 3 of them and be asked to solve for the 4th.

7 Typical problems using formula (this slide and next) Given Find Cl 2 F 2 What is the ratio of effusion rates of these two gases. Similar to #1 & 2 on p. 388 Note: 4 variables in equality, you will always be given 3 of them and be asked to solve for the 4th.

8 Given Find What is the molar mass of B? Molar mass of A = 2.5 g/mol Rate of effusion of B = 3 times that of A Similar to problem 3 on p. 388 Note: 4 variables in equality, you will always be given 3 of them and be asked to solve for the 4th.

9 3/6/2012 Standards: 4 (properties of gases) Objectives: (per. 1 & 3 Tu) (per. 2, 4, & 6 Wed; both see HW page for Tu) ● Review HW and strategies for setting up relationships and ratios in word problems. ● Dalton's Law of Partial Pressures – Be able to do calculations using DL, & atm kPa DO NOW: 1. If you have a 3 L container, and the pressure from O 2 = 2 atm, and the pressure from H 2 = 4.5 atm, and the pressure from N 2 = 1.3, then what will the total pressure be in the container? (p. 391 & plug in to formula) 2. If you have P T = 3.2 atm, and P 1 = 0.5 atm, and P 2 = 0.7 atm, and P 3 = 1.2 atm, what is the pressure from P 4 ? (p. 391 & plug in to formula) 3. Mini-Lab "Mass vs Velocity of Molecules" will be due tomorrow (10 pts) Std 4 HOMEWORK: 1. Work the following problems (see link on HW page of website): “Solving Problems a Chem Handbook”, p. 129 5-8 (3 pts) Std 4 2. Ch 13 Assess, p. 415 65-67 (2 pt) Std 4 Answers: 65 0.01 atm ; 66 0.99 atm ; 67 1.1 atm ========================================================== STAMPS: Journal 3/5/12 1. Ch 13.1 PP's, p. 388 1-3 App A Ch 13.1 p. 878 1 & 2 Ch 13 Assess, p. 415 62 - 64 (5 pts total for all 3) Std 4

10 P total = P 1 + P 2 + P 3 + P 4 +...... Dalton's Law of Partial Pressures

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12 actual theoretical

13 3/7/2012 Standards: 4 (properties of gases) Objectives: ● Students will be able to convert any unit of pressure to any other unit of press. ● Students will be able to see how partial pressure of water affects pressure. DO NOW: 1. Convert 2.75 atm into Pascals, then into Torr (use today's handout "Ch 13.1 & 14.1-14.3 Gases - Tutorial) 2. Calculating % error from lab question #'s 7 & 8. HOMEWORK: 1. SN Ch 14.1 p. 185-189 (3 pts) Std: 4 2. Ch 13 Assess, p. 415 68-71 (2 pts) Std: 4 ========================================================== STAMPS: WAIT ● Journal 3/6/12 1. Work the following problems (see link on HW page of website): “Solving Problems a Chem Handbook”, p. 129 5-8 (3 pts) Std 4 2. Ch 13 Assess, p. 415 65-67 (2 pt) Std 4. BASKET: Mass vs Velocity of Molecules LAB (10 pts)

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16 COPY EVERYTHING TO DO NOW actual theoretical

17 theoretical (calculated) - actual (your counts) theoretical (calculated) x 100 = % error Percent Error of relative rate of effusion of Cl 2 to H 2

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19 page 145, Question # 69 pressure at sea level = 1 atm

20 3/8/2012 Standards: 4 (properties of gases) Objectives: ● Introduce the combined Gas Law formula ● Be able to calculate Boyles & Charles Law problems with individual formula and Combined Gas Law formulas DO NOW: 1. Use your handout from yesterday to figure out which gas law will need to use for each of the following and then solve for the unknown: (a) given: P 1 = 700 Torr, V 1 = 500 mL, V 2 = 600 mL, find P 2, (b) given: T 1 = 400 deg C, V 2 = 550 mL, V 1 = 300 mL, find T 2 HOMEWORK: 1. Ch 14.1, Boyle, p 422 1-5; Charles, p 425 6-8 (5 pts) Std 4 ========================================================== STAMPS: ● Journal 3/7 1. SN Ch 14.1 p. 185-189 (3 pts) Std: 4 2. Ch 13 Assess, p. 415 68-71 (2 pts) Std: 4 temp. must be K degrees

21 If you have not signed up for my YouTube channel, or if we could not find your user name, you can come to me during class and show me on your phone or on my computer, that you are subscribed to my channel.

22 Boyle's Law : P 1 V 1 = P 2 V 2 Charl es Law : V 1 V 2 T 1 T 2 = http://group.chem.iastate.edu/Greenbowe/sections/projectfold er/flashfiles/gaslaw/charles_law.html http://group.chem.iastate.edu/Greenbowe/sections/projectfol der/flashfiles/gaslaw/boyles_law_graph.html temp. must be K degrees

23 P 1 V 1 P 2 V 2 n 1 T 1 n 2 T 2 = Combined Gas Law See if you can make Boyle's Law by writing this equality and then crossing out the variables that are not part of that law.

24 3/9/2012 Standards: 4 (properties of gases) ORATORICAL Objectives: ● Be able to work Boyle, Charles, & Gay-Lussac problems for Gas Laws. ● Be able to use combined gas law formula. ● Have 100% of everyone present subscribed for YouTube.com/owigger DO NOW: 1. Using your handout from yesterday, tell who’s law is being used: (a) You are given 2 temps and 1 volume; (b) you are given 2 volumes and 1 pressure; (c) you are given 2 pressures and one temp HOMEWORK: 1. Gay-Lussac, p. 427 9-13 (3 pts) Show given & find, calcs and circle your answers. (3 pts) Std 4 2. Boyles's Law Worksheet (handout) - Show given & find, calcs and circle your `answers. Do the following problems: 5, 6, 7 (a&b), 9 (a&b), 11 (a&b), 17 (a&b), 19 (a&b), and 21 (5 pts) Std 4 ============================================================ STAMPS: ● Journal 3/8 Ch 14.1, Boyle, p 422 1-5; Charles, p 425 6-8 (5 pts) Std 4

25 To get credit and get off the "ugly list" 1. Sign in to YouTube.com and show me you have subscribed to YouTube.com/owigger 2. Call me over to verify your subscription. 3. Sign out but LEAVE THE COMPUTER ON YouTube.com

26 How to Identify Variables http://mrwiggersci.com/chem/Tutorials/ch14-gases-all- formulas.htm Link above goes to a 2 page handout you received in class. Picture to the left is from the bottom of it's page 2. Typical Variables: mmHgTorr mLkPa nL K°C Pa psi

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