Archive – Q2 week 7 – 19-20
Week of 12/16 – 12/20
12/16 – Monday – Period 2
1. Last week Homework review:
2. Kinetic Molecular Theory Derivation – Take notes – quiz Tuesday
In your reference Tables:
– Period 3/4
1. drinking bird explanation/ love meter
2. Kilopascal units
3. Last week homework review
4. Lab 16 – final comments and errors
5. Kinetic Molecular Theory Derivation – Take notes – quiz Tuesday no retakes!
Vapor Pressure Presentation:
12/16 – Monday – Homework:
We are moving into the last topic of Gas Laws. We will pick up Buoyancy in our Hot air Balloon Lab in couple of days but remember it is an application of the Torricelli’s experiment as the height of the fluid above the object determines the buoyant force.
We have been describing how the different variables affect each other with the derivation of our gas laws but we have not explained why gases behave this way. Gas behavior is explained through the Kinetic Molecular Theory and it is best understood through ANOTHER Derivation!!
1. Please watch me derive the Kinetic Molecular Theory formulas in the video below. Take notes and follow along with me. I am going to give you a quiz on this derivation tomorrow.
START THE VIDEO AT 24:00 which will pick up where we left off in class FOR BOTH CLASSES!!
I will give you the assumptions, Governing Equations, and the symbols.
I will give you some of the derivation in a skeleton format to help you complete it.
2. Please make a second submission to the Archimedes Principle Form.
3. Lab 16 – Due tomorrow!
Video of Grodski completing the derivation:
START THE VIDEO AT 24:00
END of Monday!
12/17 – Tuesday – Period 2/3 –
1. Complete derivation in class.
2. Kinetic Molecular theory formula derivation Quiz – 10 minutes
3. Units of R for Kinetic molecular Theory.
4. Kinetic Energy Demonstrations –
Bernoulli’s Principle: rolled up paper
Blow up Bag, Blower with beach ball, toilet paper
ping pong launcher,
Air cannons – vortex, toilet paper.
Vacuum Chamber – marhmallows, Accordian tube, foam
Notes:
In Kinetic Molecular Equations – (Used to help describe why gases behave according to the ideal
gas law and all of its derived equations: M = dRT & d = PM
P RT
Kinetic Molecular Equations are centered around Kinetic Energy formula, KE = 1/2 mu2
and thus are centered around the SI unit of energy = Joule.
Thus our Kinetic Molecular equations must have terms or units that reflect equivalents in Joules.
Remember from experimental evidence PV = nRT or R = PV
nT
and we have been using .08206 (atm L)
(mole K)
as our Gas Law constant (proportionality constant) and you have learned that you must be in same units for your variables as your ideal gas law constant, R otherwise units do not cancel and your calculation will be in error.
In Kinetic Molecular Equations we cannot use this value of R
that has uses Pressure (atm) and Volume (V) in its Numerator.
We need a value of R that uses Joules instead in order to reflect the KE that is part of the derived Kinetic Molecular Equations that you derived 2 night ago.
KE per mole = 3/2 RT Urms = √3RT
Root Mean Squared Speed M
This R cannot be the same value as we have been using as it needs to reflect Joules (Energy).
Well fortunately, P x V (the numerator in R) actually can equal Joules if we change the units of
Pressure from atm to Force/Area and Volume from L to meter3 (length x width x height):
Force = mass x acceleration due to gravity
Kg x meter/sec2
Area = meter2
P x V = Energy
force/area length x width x height
Force x meter3
meter2
( Kg x meter/sec2 ) x (meter3 ) = Kg meter2 = Joule
meter2 sec2
So with our Kinetic Molecular equations we use R = 8.31 J _
mol K
This is given in our reference tables:
Also because a joule is really a Kg meter2 / sec2 then M must be in Kg!
Kinetic Molecular Theory Presentation:
Period 4 –
Love meter..
1. Complete derivation in class.
2. Kinetic Molecular theory formula derivation Quiz – 10 minutes
3. Units of R for Kinetic molecular Theory.
12/17 – Tuesday – Homework
1. Please complete just the front page of the Gas Law worksheet 6 – kinetic energy-grahams law.pdf worksheet.
2. Review with the key but I suggest you follow along with me in the video below.
Lecture that reviews Gas Law worksheet 6: View up to 20:30 only
End of Tuesday!
12/18 – Wednesday – Period 2
1. Review Kinetic Energy homework – conversions
2. Return Kinetic Theory Derivation quiz
a) looked at the backside (2 important graphs).
3. Derive Graham’s law of Diffusion –
a) model first problem on backside of last nights homwork
2 gases at the same temperature:
KE = 1/2 µ2
Gas A: 10000 J = 1/2 (2 Kg/mol) (100 m/sec)2
Gas B: 10000 J = 1/2 (200 Kg/mol) (10 m/sec)2
Graham’s Law of diffusion Demo’s
a) Demo Graham’s law effusion and diffusion of the 2 balloon in class.
b) Manometer with He and SF6
c) Amazing Grace – speed of sound
Grahams Law of diffusion demos used in class discussion:
HCl and NH3
Period 3/4
1. Review Kinetic Energy homework – in the conversion
2. Return Kinetic Theory Derivation quiz
a) looked at the backside (2 important graphs).
3. Derive Graham’s law of Diffusion –
a) model first problem on backside of last nights homework
4. Graham’s Law of diffusion Demo’s
a) watched HCl and ammonia (2 videos)
b) manometer with He and SF6
c) Hung a ballons
d) Amazing Grace – speed of sound
So after today we now have another gas law equation in our reference tables:
Grahams Law – really root mean squared:
12/18 – Wednesday Homework:
1. Please complete the second side of the Gas Law worksheet 6 – kinetic energy-grahams law.pdf
worksheet.
2. Review with the key
*At 20:30 of the lecture posted last night I review the first problem on the second side.
Today’s Grahams Law manometer demo:
Amazing Grace Demo:
End of Wednesday..
12/19 – Thursday – period 2/3
1. Graham’s Law of Diffusion/Effusion
a) Helium, Sulfur Hexafluoride balloon hang.
2. Kinetic Molecular Theory
a) Boyles Law – potato r
b) Shrink Wrap – Human vacuum chamber
3. Boyles Law Movie
4. Buoyancy – Archimedes Principle
a) Bubbles –
b) Propane and Hydrogen bubbles –
c) Physical intensive and extensive properties
– period 4
1) Kinetic Molecular Demo – Balloon and N2 (l)
KE is tied to Temperature and molecular speed.
2. Complete Kinetic Energy Demonstrations –
Vacuum Chamber – marhmallows, Accordian tube, foam
potato lancher
12/19 – Thursday – Homework
1. Complete Holiday Shopping for your tallest teacher!
*Remember Please do not be Rude or make me uncomfortable! LOL!
2. Please complete the form below:
Grahams Law Balloon Hang:
Yesterday:
Today:
End of Thursday..
12/20 – Friday – period 2
Holiday demo:
1: Holiday cross linked phosphorescent polymers
2: Make a take home Yule log! Its a Hot activity!
3: Give Thoughtful and Expensive Gifts to your tallest AP Chemistry Teacher.
period 3,4
1. Complete Kinetic Energy Demo’s
Bernoulli’s Principle: rolled up paper
Blow up Bag, Blower with beach ball, toilet paper
ping pong launcher,
Air cannons – vortex, toilet paper.
Vacuum Chamber – marhmallows, Accordian tube, foam
bubbles
2: Holiday cross linked phosphorescent polymers
3: Make a take home Yule log! Its a Hot activity!
4: Give Thoughtful and Expensive Gifts to your tallest AP Chemistry Teacher.
12/20 – Friday – Holiday Homework
1. Please check the counter daily and fill the form below to prove your diligence.
End of week 7 and the End of 2019!