Select Page

Archive – Q2  week 8 – 19-20

Week of 1/6 – 1/10

1/6 – Monday – period 2 and 4
Results of our Graham’s Law of Effusion Demo:
1. Return graded labs for review – need to be returned for Regents hours credit
2. Kinetic Molecular Theory – Part B – Limitations to the Gas Laws – Real vs. Ideal Student
A) Van der Waals Equation –  An equation created to “fix” the problems with gas law calculations.

1. Pressure is less than what is calculated for in Real Gases

2. Volume is greater than what is calculated for in Real Gases

Kinetic Molecular Theory Presentation:
Period 3 – Lab 17 – Hot Air Balloon Lab

1) Archimedes Principle- The buoyant force is due to the mass of the displaced fluid (gas or liquid).

2) Archimedes Principle reviewed:

3) Design of Hot Air Balloons –

1/6 – Monday Homework – I will be collecting Gas Law homework worksheets that may include these.

1.  Please complete the first side of the Gas law worksheet 8 – Van der Waals.pdf worksheet and review with the key.

Gas law worksheet 8 – Van der Waals.pdf

Gas law worksheet 8 – Van dew Waals Key.pdf

Period 2 onlyPeriod 4 did not get far enough in class..

2: Watch the lecture below and follow along with me on the first side.

3: Complete the backside of the worksheet and review with the key below:
Gas Law worksheet 9 – Hot Air Balloon Buoyancy Bonanza.pdf
Gas Law worksheet 9 – Hot Air Balloon Buoyancy Bonanza KEY.pdf
Hot Air Balloon Calculations Lecture:

End of Monday..

1/7  – Tuesday – period 2 –

1) Wrap up Kinetic Molecular Theory – Van der Waals Equation – slide 29, 30 graphs

a) Ideal vs Real Gases –  Gases that are more Ideal at same conditions
Changing conditions to makes gases more ideal or Real

b) REAL GAS Behavior –  Balloon in N2 (l), He and then Air
deflation demo, inflation demo
Absolute zero demonstrator – calculation
Crush Large Can – Real Gas behavior
Horn –
Egg in the bottle again-
Gold fish

c) Vapor pressure             – Paint Can Demo –
– If we could see steam demo

d) cryogenics                     – Banana and nail
– raquet ball
–  liquid oxygen

Vapor Pressure – demo – N2 (l) – boiling point = -196 degrees Celsius or 77 Kelvins.
A) Fog with Hot water
B) Paint Can! Vapor pressure

Vapor Pressure = Force of colliding molecules due to evaporation.
Boiling Point =  Vapor Pressure = Atmospheric Pressure

period 3/4

A) Van der Waals Equation –  An equation created to “fix” the problems with gas law calculations.

1. Pressure is less than what is calculated for in Real Gases

2. Volume is greater than what is calculated for in Real Gases

(B) REAL vs Ideal gas demos – posted above in period 2

(C) HOT AIR Balloon Lab

1/7  – Tuesday – Homework –

Period 3/4 only:
1. Complete Van Der Waals worksheet and review the key –

Gas law worksheet 8 – Van der Waals.pdf

Gas law worksheet 8 – Van dew Waals Key.pdf

Everyone:

2. Complete and Review all Gas Law Worksheets that were given out for this Unit – This is studying for the test.

3.  Study the 2 labs that were given back yesterday.

Today’s demo’s: (sort of):

Vapor Pressure Can:

Vapor pressure – IF we could see “STEAM”!!
Kinetic Molecular Theory of liquid nitrogen and a balloon:
Flowers and liquid nitrogen:
The egg in and out of the bottle with liquid nitrogen:

End of Tuesday..

1/8  – Wednesday – period 2/3

1. Review Van der Waals Homework –
Gas law worksheet 8 – Van dew Waals Key.pdf

2. Complete Demo’s
a) Vapor pressure- paint can redo,

b) Rate of reaction – light sticks, radio
c) Cryogenics – racket ball redo, banana

Below a certain temperature—called the glass transition temperature—a solid goes from ductile to brittle because molecules cannot easily slip and slide on a microscopic scale, bonds cannot break and reform, and thus cracks will start and quickly spread, causing the material to become brittle and break.

glass Glass Transition State = 550 °C
rubber Glass Transition State = -72°C
d) Real Gas Behavior – Air horn, condensation of O2

Real Gas behavior put to use in Alaska pipeline.
Slide  19 –  in Vapor Presentation presentation.
e) Real Gas demo calculation demo – with gas laws and absolute zero demonstrator
HOT AIR Balloon Lab – design and start constructing

– period 4
1.  Review Van der Waals Homework –

2.  Demos a – e posted above.

3.  Alaska pipeline – Slide  19 –  in Vapor Presentation presentation.

Vapor Pressure presentation that contains Alaska pipeline:

#### Vapor Pressure 14/15 – Pressure Introduction

1/8  – Wednesday – Homework

1.  Part one of the Gas Law Test – This portion is the take-home portion of the test
This is due Tomorrow in Class!

2.   Make sure all Gas law Worksheets are completed – I will ask for some of them tomorrow!

Today’s demos

Air horn: Lowering the vapor pressure of liquid in can

Calculated Real Gas Demo:

Light Sticks – Rate of Reaction:

REAL GAS DEMOs/Analogies :
End of Wednesday…

1/9  – Thursday – period 2 – Gas Law Test

period 3 – Gas Law Test

period 4 – HOT AIR Balloon Lab –

1/9  – Thursday  Homework –

1. Complete Take home portion of the Test – (page 9 and 10)

2. Make sure you have other Gas Law worksheets ready for submission.

1/10  – Friday –      period 2 – Gas Law Test – complete

period 3 – HOT AIR Balloon Lab – Start the construction
liquid oxygen

Liquid Oxygen Preparation Demo:

period 4  Gas Law Test – complete

Molecules (composed of atoms) of air inside the Wubble Ball meet liquid nitrogen:
Would this demo work is there were no atoms???
1/10  – Friday – Homework – ATOMIC STRUCTURE BEGINS!

There are 2 assignments this weekend.

1. Most important Atomic Structure Experiments
2. The Mass Spectrometer

1. Most important atomic structure experiments-

What is the Transition Here? How does atomic structure connect with gases???
Hmmm?? May be slides 21 – 42 will awaken your senses!!!

Everything we did in stoichiometry is due to atoms!!!!!

Please complete form with a specific description in your own words of the experiment that were of the most significance from the following people:
(I need specifics and not simple generalizations)

Update slide numbers!

a: J. J. Thompson  : Slide 44 – 52 on presentation below/ MIT Lecture 1 @ 30:40

b: Robert Millikan  : Slide 53 – 54 on presentation below

c: Earnest Rutherford:  Slide 55 – 60 on presentation below/ MIT lecture 2 below

d: H. Moseley  : Slide 61 on the presentation below AND THE LINKS BELOW:

e: James Chadwick : Slide 61 on the presentation below

MIT lecture 1:

MIT lecture 2:
2. The Mass Spectrometer Assignment
Detecting Isotopes and determining average isotopic mass.

A) Please listen to the video on the basics of mass spectrometry below:

B:  Please view the mass spectroscopy video below and follow along with me with worksheet below:

Atomic Structure Isotopes Mass Spectrometer.pdf

C.  Complete the

Atomic Structure Isotopes Mass Spectrometer.pdf and complete with key.

Atomic Structure Isotopes Mass Spectrometer Key.pdf

E:  Complete the Atomic Structure – Mass Spectroscopy .pdf worksheet and review with the key.

Atomic Structure – Mass Spectroscopy .pdf

Atomic Structure – Mass Spectroscopy Key.pdf

F:  Fill out the form below:
******Question 5 will reveal itself after or during Questions 6.