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Discrepant events and Demonstrations B. Law Unionville High School

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Presentation on theme: "Discrepant events and Demonstrations B. Law Unionville High School"— Presentation transcript:

1 Discrepant events and Demonstrations B. Law Unionville High School

2 Demonstration is a scientific experiment carried out for the purposes of demonstrating scientific principles. Students may have learned about the scientific principles before seeing the demonstration.

3 Discrepant event is one that does not appear to follow basic “rules of nature”. Outcome of a discrepant event is unexpected or contrary to what one would have predicted.

4 There is no guarantee of learning when students observe or experience discrepant events. (They may have ignored or rejected it) Some strategies are recommended: 1.predict the outcome; 2.construct one or more theoretical explanations; 3.observe the outcome; 4.modify the theoretical explanation; 5.evaluate competing explanations;

5 Safety comes first in both discrepant event or demonstration

6 (A-1) Singing plastic tubes Material: plastic vacuum tube / tubes from dollar store [Related to: Gr. 11 physics – sound unit] High pitch sound is produced when swirling a long plastic tube

7 (A-2) Blue Bottle demonstration - The solution will turn blue when you shake it. It will turn back to colorless after a short while Materials: Dextrose, Potassium Hydroxide, methelene blue indicator [Related to: Gr. 9/10 Science – Chemistry unit] Explanation:

8 (A-3) Needle-proof balloon – A normal party balloon will not pop even a sharp needle is inserted into it. Materials: Syringe/needle, balloons [Related to: Gr. 9/10 Science – Chemistry unit]

9 (A-4) Fireproof balloon – A normal party balloon will not pop when it is placed above a burning candle. Materials: Candle, Balloon (with water inside), retort stand and ring clamp. [Related to: Gr. 9/10 Science – Chemistry unit]

10 (A-5) Colorful fireball – Fireballs in different colors will be produced when spraying the solution on a burning candle. Materials: Spray bottles, Solution contains mineral nitrates and alcohol [Related to: Gr. 9/10 Science – Chemistry unit]

11 (A-6) Isopropanol / Ethanol in pop bottle – vigorous combustion reaction can be observed Materials: Isopropanol / Ethanol, dry 2L pop bottles, candle [Related to: Gr. 9/10 Science – Chemistry unit]

12 (A-7) Isopropanol / Ethanol in big water bottle -- vigorous combustion reaction can be observed Materials: Isopropanol / Ethanol, Empty distilled water bottle (large size) [Related to: Gr. 9/10 Science – Chemistry unit]

13 (A-8) Is it illegal to burn this paper bill? – Paper bill can not be burnt when it is soaked with 50/50 rubbing alcohol. Materials: Isopropanol, $5 paper bill, candle [Related to: Gr. 9/10 Science – Chemistry unit]

14 (A-9) Water “fall” ? – Good way to demonstrate the force between water molecules (surface tension) in particle theory. Materials: Erlenmeyer flask, wire mesh, water [Related to: Gr. 9 Science – Chemistry unit]

15 (A-10) CCD – Infra-red detector – IR beam can be detected by using a digital camera/video camera. Make the invisible become visible. Materials: Any remote control, Video camera / Digital camera,TV/ LCD projector with video input [Related to: Gr. 11 Physics – Optics unit]

16 (A-11) Antigravity coffee can Materials: Large Coffee can, 1 kg mass, duct tape [Related to: Gr. 12 Physics – Energy unit]

17 (B-1) Hammering a nail into a wood over head (Newton’s 1st law) Materials: Few text books, block of wood, nail and hammer. [Related to: Gr. 11 Physics – Dynamics unit]

18 (B-2) Hydrogen Rocket – Newton’s 3 rd Law Materials: Empty Pringles’ can, Sulfuric acid, Zinc metal, Candle. [Related to: Gr. 11 Physics – Dynamics unit]

19 (B-3) Few Bernoulli’s principle demonstrations (escaping egg, jumping coins, suspending ping pong ball, suspending squash ball) Materials: raw eggs, small paper cups, coins, 250ml beaker, ping-pong balls, squash balls, hair dryer and leave blower. [Related to: Gr. 12 Physics – Dynamics unit]

20 (B-4) Centripetal force demonstration Materials: Wooden stage with strings attached to it, bucket with water [Related to: Gr. 12 Physics – Dynamics unit]

21 (C-1) That’s a cool pen holder Materials: Erlenmeyer flask, party balloon, electric kettle, beaker with cold water [Related to: Gr. 9/10 Science – Chemistry unit]

22 (C-2) Sacrificing Gummy Bear Materials: Sodium Chlorate (KClO3), large clean Pyrex test tube, retort stand and test tube clamp, one gummy bear, Bunsen burner. [Related to: Gr. 9/10 Science – Chemistry unit, Gr. 11/12 Physics – Energy unit] Explanation:

23 (C-3) Density demonstration – suspending soap bubbles in a fish tank Materials: Empty fish tank, baking soda, a bottle of vinegar, soap bubbles solution. [Related to: Gr. 9/10 Science – Chemistry unit]

24 (C-4) Dying of the fire dragon -- Methane gas + Soap bobbles Materials: Methane gas (Bunsen burner gas), soap bubbles solution [Related to: Gr. 9/10 Science – Chemistry unit] Extra Safety Note: Wet your hands prior to handling the soap bubbles before burning

25 (C-5) Sparkling finger -- Lighting up Bunsen burner using index finger Materials: Van de graaff generator, short plastic stool (or inverted recycling bin), Bunsen burner [Related to: Gr. 9/10 Science – Chemistry unit, Gr. 11/12 Physics – Electricity unit]

26 THE END Tips: Try the demonstrations/discrepant events before showing students!

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