5Halloween Chemistry: Rationale Halloween Chemistry combines learning of Chemistry with fun and helps students gain better understanding of Chemistry while arising their curiosity.
6Halloween Chemistry at AP Chemistry Level There are three components of Halloween Chemistry Presentation at AP Level:Halloween Demos by the teacher (15 mins)Halloween Costume Presentations by the students (35 mins)
10Materials: 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.
11Chemistry behind this demo: Flame Test Colors: Ca2+ Red, Ba Ion Pale Green, Cupric Ion Blue-green, Strontium Ion Brick RedReview of Bohr’s Model and release of energy with electron transitionDisposal: 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.
12Strontium Ion’s Flame Color Cupric Ion Flame Test Color in its Full GloryStrontium Ion’s Flame Color
14Materials: 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.
16Chemistry Behind the Reaction Combustion of Hydrocarbons:CxHyOz + O2 CO2 + H2O + HeatC2H5OH + O2CO2 + H2O + HeatDisposal: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.
18Materials: 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 thiscorn starch in burner flame with force. It is pretty spectacular!
19Disposal: 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 AreaSafety Precautions:1. Do NOT inhale corn starch. Take a deep breath and while you have the cornStarch in your mouth, try not to inhale it.2. Try this demo couple of times before performing in front of students.
20PART II: Students’ Halloween Costumes Some Costume Topics/Descriptions
21Topic Description Shielding Students dressed as knights with shields protecting a princess (electron) from a witch.Heisenberg Uncertainty PrincipleStudents 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 strengthStudents dressed as Supergirl “S” and Catwoman “Ca” bond to form CaS and fought against Invisible Woman “I2”. CaS wins because the ionic bond is stronger than the covalent bond
22Rutherford’s Gold Foil experiment Students dressed up as a gold particle, alpha particle emitter, and detecting screens.Electron energy levels and emissionsStudents 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
23Electron AffinityStudents 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
24Some Videos on Halloween Chemistry MVHS AP Chemistry Students
32Halloween Chemistry at 10th Grade Level Chemistry and Chemistry Honors
33Halloween Demos by Teacher Oozing pumpkinGenie coming out of the bottle
34Oozing Pumpkin Materials Carve out a pumpkin. Baking Soda, Vinegar, Red Food Coloring, Dish SoapProcedureCarve 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 pumpkinPut 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.
35Genie in The Bottle (From Flinn) Materials: H202 (30%), Mn02 (catalyst), 2 L soda bottle, threadProcedureMake a pouch of about 1 spatula full of Mn02 in a tissue paper and tie it with a thread.Fill an empty 2L soda bottle with H202 and hang in the MnO2 pouch in there, making sure that thread is caught in the bottle cap so pouch does not fall into the bottle unless cap is unscrewedAt the time of demo, unscrew the cap. The pouch will fall inside H202 starting a spectacular reactionDisposal:In trash, after all H202 has been decomposed.
37PART II: Students’ Halloween Costumes Some Costume Topics/Descriptions
38Student CostumesThe 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.