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Presented by Kavita Gupta, Instructor AP Chemistry, Science DC Monta Vista High School, Cupertino, CA Halloween Chemistry.

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Presentation on theme: "Presented by Kavita Gupta, Instructor AP Chemistry, Science DC Monta Vista High School, Cupertino, CA Halloween Chemistry."— Presentation transcript:

1 Presented by Kavita Gupta, Instructor AP Chemistry, Science DC Monta Vista High School, Cupertino, CA Halloween Chemistry

2 This session’s power point is available on the above website. Presenter’s MV Chemistry Website url

3 Monta Vista High School 21840, McClellan Road, Cupertino, CA

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5 Halloween Chemistry: Rationale Halloween Chemistry combines learning of Chemistry with fun and helps students gain better understanding of Chemistry while arising their curiosity.

6 There are three components of Halloween Chemistry Presentation at AP Level: 1. Halloween Demos by the teacher (15 mins) 2. Halloween Costume Presentations by the students (35 mins) Halloween Chemistry at AP Chemistry Level

7 Halloween Chemistry Part I: Teacher Demos

8 Halloween Demos by the teacher 1.Flaming Pumpkin with Colored Fires 2.Desks on Fire 3.Fire-Breathing

9 Flaming Pumpkin with Colored Fire

10 Materials: Large Pumpkin, Calcium Acetate Trihydrate (~20g), Ethanol (enough to make a slurry) Nitrates of Calcium, Strontium, Barium and Copper (II) Methodology: Make a slurry of Calcium Acetate Trihydrate by mixing enough alcohol in it. Put this slurry in a carved and cleaned pumpkin. Light the pumpkin on fire using a lighter. You may do this demo outside of the fume hood. Now add one spatula full of each of the salts one by one to see that flame test colors. Student Assessment/Review: Students will identify the cation in the salt based on the flame test color.

11 Chemistry behind this demo: Flame Test Colors: Ca 2+  Red, Ba Ion  Pale Green, Cupric Ion  Blue-green, Strontium Ion  Brick Red Review of Bohr’s Model and release of energy with electron transition Disposal: Pumpkin + left overs can be put in regular trash after completing combustion. Safety Precautions: Please wear goggles while performing this demo and put the container of alcohol away from the open flame.

12 Strontium Ion’s Flame Color Cupric Ion Flame Test Color in its Full Glory

13 Desk on Fire Demo

14 Materials: Calcium Acetate Trihydrate (~20g), Ethanol (enough to make a slurry), match Methodology: Mix the ethanol in Calcium Acetate Trihydrate to make a slurry. Using a glass rod or a spatula, write whatever you desire on the desk. Make sure that the letters are touching each other for a continuous fire. Now light the fire at any letter. The whole lettering will light up.

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16 Chemistry Behind the Reaction Combustion of Hydrocarbons: CxHyOz + O 2  CO 2 + H 2 O + Heat C 2 H 5 OH + O 2  CO 2 + H 2 O + Heat Disposal: After combustion of alcohol, ashes can be disposed off in regular trash. Safety Precautions: Please wear goggles and keep container of alcohol away from demo area.

17 Fire-Breathing

18 Materials: Burner, Corn Starch, lighter Methodology : You might need to practice it before doing this demo in front of the class! Set a burner on a table and light it. Take two spoonfuls (or as much as your mouth can hold) of corn starch in your mouth. Blow out this corn starch in burner flame with force. It is pretty spectacular!

19 Disposal: Wipe table with a wet paper towel. Rinse your mouth to get rid of excess corn starch. Chemistry Behind the Reaction: Reaction Rates and Surface Area Safety Precautions: 1. Do NOT inhale corn starch. Take a deep breath and while you have the corn Starch in your mouth, try not to inhale it. 2. Try this demo couple of times before performing in front of students.

20 Some Costume Topics/Descriptions PART II: Students’ Halloween Costumes

21 TopicDescription ShieldingStudents dressed as knights with shields protecting a princess (electron) from a witch. Heisenberg Uncertainty Principle Students were in a car but couldn’t get arrested because you can’t determine the speed and location of an electron at the same time. Relative bond strength Students dressed as Supergirl “S” and Catwoman “Ca” bond to form CaS and fought against Invisible Woman “I 2 ”. CaS wins because the ionic bond is stronger than the covalent bond

22 Rutherford’s Gold Foil experiment Students dressed up as a gold particle, alpha particle emitter, and detecting screens. Electron energy levels and emissions Students dressed up as nucleus, electron, and energy, and demonstrated how energy added causes an electron to jump to excited state, and then how the electron releases the energy in the form of electromagnetic radiation

23 Electron Affinity Students dressed up as Fluorine and Neon atoms and an electron- the two atoms, living on Period 2 block, see the lone electron, and Fluorine takes it in because it has higher electron affinity (represented by more space in its house) Hund’s RuleStudents dressed up as the “Neon family” of electrons, and sat down at their dinner table- each in a different seat, because two electrons about a single atom cannot share the same set of quantum numbers

24 MVHS AP Chemistry Students Some Videos on Halloween Chemistry

25 Ionic Bonding

26 The Gold diggers

27 Helium Atom

28 TNT

29 Like a Chemist

30 Arrghon (Argon)

31 AgCl Precipitation

32 Chemistry and Chemistry Honors Halloween Chemistry at 10 th Grade Level

33 Halloween Demos by Teacher Oozing pumpkin Genie coming out of the bottle

34 Oozing Pumpkin Materials Baking Soda, Vinegar, Red Food Coloring, Dish Soap Procedure Carve out a pumpkin. Add vinegar (enough to fill it just below first carving), food coloring (few drops) and soap (2 tea spoons). At the time of demo, add baking soda and red froth is going to come out of pumpkin Put a big dish under the pumpkin to catch the spill. Pumpkin can be used through different classes, by refilling the material. Dispose in trash at the end of demo.

35 Genie in The Bottle (From Flinn) Materials: H (30%), Mn0 2 (catalyst), 2 L soda bottle, thread Procedure Make a pouch of about 1 spatula full of Mn0 2 in a tissue paper and tie it with a thread. Fill an empty 2L soda bottle with H202 and hang in the MnO 2 pouch in there, making sure that thread is caught in the bottle cap so pouch does not fall into the bottle unless cap is unscrewed At the time of demo, unscrew the cap. The pouch will fall inside H starting a spectacular reaction Disposal: In trash, after all H has been decomposed.

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37 Some Costume Topics/Descriptions PART II: Students’ Halloween Costumes

38 Student Costumes The costumes ranged from Mentadent Toothpaste costume (for Fluoride), Cow ( for Ca), Salt shaker ( for Sodium), Glow in the dark costume ( for phosphorus), Battery ( for Nickel), Statue of Liberty ( for copper by), Skeleton (for Ca), Glow-in-the-dark clothing (Phosphorus), double replacement reactions (NaOH + HCl) and Heisenberg.

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40 Phosphorus (Glow in the Dark), Graphite (Pencils- Allotrope of Carbon) and Calcium (skeleton)

41 Double Replacement Reaction: Metathesis

42 Beryllium Fluoride and Magnesium

43 Double Replacement

44 Heisenberg

45 Thank you for your time!


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