Week of 5/26 – 5/29
5/26 – Tuesday – We will meet at 10:00 am today!
Link to todays Meeting: password: 5y*@013J
*If you have not signed up for the Make-Up Test -( June 2nd – 4:00 pm ) today is the last day to
RULES OF THE PRESENTATION:
G – Introduction: Who is going to speak and introduce this presentation? – Flaming book –
Intro questions about Flaming book-
How did this work?
Scientific Model- needed to answer this. Student will answer this at the end!
WE NEED TO SET THE STAGE FOR WHAT WE ARE TEACHING!
a) You must set the stage for what we are doing and how we will accomplish this.
b) You must discuss the Big Picture of our presentation
c) We will be using the basic scientific model to explain what these demos are illustrating and why they work.
Particles make up all things —–> Kinetic Energy ——> properties, (pressure, density, etc)
c) segway into the first introductory demos (prove that particle exist – GASES!!!!!!!!!)
Solids —-> Liquids —–> GASES!!!
A 1. Whoosh Bottle with a twist! ethanol and O2 – show chemical reaction
– chemical reaction – Collision of different atoms that create a NEW Substance – Chemical Change
New chemical Formed
Chemical Properties – description on the ability or lack of ability of the particles to create new
combinations of atoms (particles)
– physical change – No new substance was formed but only its form changed – Physical Change
NO new chemical formed
Physical Properties- a description on the form of the arrangement of particles (color, density, phase, volume, mass, etc)
What was NEW in this reaction? – from observations and chemical reaction
Was this a chemical change or a physical change? – (loaded question)
What was chemical ?
What was physical? – Introducing pressure –
Pressure was created by the chemical reaction….
Pressure is the force created by molecules moving and colliding on a object!
(increasing gas particles, Heat released expanded those gases outward.
What caused the bottle to implode?
REAL WORLD Applications – Pistons in Steam engines – Trains!!!!
Pistons in internal Combustion engines!!!
C 2. Cyclohexane – whoosh bottle – flamethrower
also reacts with oxygen but evaporates much easier (weaker IMF) and thus does not whoosh but only reacts when it hit oxygen.
REAL WORLD Applications
Its the reason that out propane tanks in our BBQ’s do not explode when we start them. The reaction does not rush into the tank because there is no oxygen.
B S3. Pressure exits as force that we take for granted –
cardboard and glass/screen/5 liter
G 4. Syringe with manometer.
REAL WORLD Applications – barometer, sphygmomanometer
A 5. Syringe with marshmallow.
– increasing the space for the same number of particles lowers the pressure
– Marshmallow is a colloid (physical form) with air trapped in a polymer.
F 6. Vacuum chamber – takes the particles out of the air. (lowers the force on the subject) –
Tie this to the Whoosh bottle
Physical or Chemical Changes?
– Accordion Tube
– Shaving cream
REAL WORLD Applications – vacuum sealed food – freeze dried – astronaut food.
G – 7. Shrink Wrap “Brady” –
– taking the air and pressure out of a bag that a student sit in.
B – 8. Potato cannon – Increasing the pressure by decreasing the space in clear tube.
We can lower the pressure other ways..by changing the temperature – slow the number of collisions
A 9. Crush the Can –
REAL WORLD Applications – Is it harder to open your refrigerator door or the your freezer?
Has a top of a pot ever been stuck?
F 10. Egg in and out of bottle – with heat
D 11. Egg in and out of bottle – with lack of heat (cold is just the lack of heat) Cold does not flow.
observations: Fog not steam being
Liquid Nitrogen – is the liquid form of a gas we breath in everyday. Since it is a gas at room temperature that means that it has evaporated already or that is has evaporated at a much colder temperature (-196 degrees Celsius)!
– we are making the gas molecules/particles move slower with lowered temperatures and thus the collision that make pressure are less.
C 12. Balloon deflation – liquid nitrogen on a air blown balloon.
G 13. Money deflation – I will do this one with my boys
D 14. Paint can with liquid nitrogen – Vapor pressure or the ability of liquid nitrogen to evaporate
Why is the paint can exploding its lid? Would you expect your water to react the same way?
REAL WORLD Applications – kettle that will noise..top of pot cover rattles
E 15. Fog Horn with liquid nitrogen – we will go back to this demo as it cools-
E 16. Racquet ball with liquid Nitrogen- temperature can change the properties of a solid.
E 17. Radio and Glow sticks – Lower temperature result in lower collisions that lower the speed
of chemical reactions
D 18. Fog – with liquid nitrogen – 2 liter beaker with hot water and liquid nitrogen
*This is what you would see if you could see steam!
G 19. Classroom Fog Demo- 5 gallons of boiling water and 10 liters of liquid nitrogen.
F 20. Propane vs Hydrogen Bubbles – Chemical vs. Physical Change
C. 21. Hydrogen balloon vs, helium
C. 22. Bernoulli’s Principle- Air Cannons
B 23. Bernoulli’s Principle – Bag in one breath –
A. 24. Bernoulli’s Principle –Ping PONG spheres
G – 25. Vortex – Smoke rings
5/26 – Tuesday – Homework: There are 3 parts!
1. Please fill out the form below with your CORRECT EMAIL address. NOT YOUR personal email.
I need your school email to give you links to the webcast.
2. Continue writing scripts in describing your demo and prepare your explanations. There will be Q & A with the Middle School and Elementary School students. You must be over prepared. No one should be winging it!
3. Please cut and paste your script into the shared google doc that has the Master List of Demos when you are done so that you can see what other people are doing and how to connect your demo into theirs! DO not erase anyone else’s group work. Only your own!
End of Wednesday..
5/27 – Wednesday – We will meet 12:00 am today!
We play with the Zoom webcast software. I will give you a link if you responded to yesterdays form.
5/27 – Wednesday – Homework:
1. Solidify our order and who is doing what in each group. Solidify the scripts!
5/28 – Thursday- We will meet at 6:00 pm today!
6:30 pm start!
5/28 – Thursday Homework– None!
5/29 – Friday- We are NOT meeting today!
Thank you to everyone who participated Thursday night. I recognize that it may have taken you away from your time or another event. Thanks for going above and beyond! I know we put smiles on the faces of many young students and possibly they even learned something!
We will meet Tuesdays and Friday’s at 9:30 till the rest of the year. We will learn the organic chemistry and nuclear chemistry.
*I will have powerschool updated by Monday.
5/29 – Friday – Homework