School science experiments

Purple Flame Magic

Materials
5g of pottassium permanganate cystals, 2ml of glycerol, a porcelain tile and a dropper.
Procedure
Pile 5g of powdered KMnO4 crystals on a porcelain tile.Make a small depression on the centre of the pile. Using a dropper or a glass tube add carefully about 3 to 4 drops of glycerine to the depression. After a few seconds a white puff of smoke is produced followed by sparks and purple flame.
Discussion
This experiment demonsrtates spontaneous combustion. KMnO4 oxidizes glycerol exothermically producing heat and light.
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Praveen Kamath Sir, GHS Ankanahally, Somavarpet Taluk, Kodagu

Soap hating and sugar loving match sticks

Materials
A bowl with water, match sticks, sugarlump, soap piece.

Procedure
Arrange the match sticks (about 6 of them)in the bowl of water leavinf space between the ends about the size of a rupee coin.
Place a small piece of soap with a stick at the center. The match sticks run away to the sides of the bowl showing they hate the soap.
Remove the soap piece and place a lump of sugar at the center of the bowl. All the match sticks will come to the center showing they love sugar.

Discussion
Soap contains long chain sodium salt fatty acids which are hydrophobic and repelled by water molecules.So the sticks go away to the sides.When sugar is placed in the bowl the water molecules dissolve the sugar particles and their attraction causes the match stiks to come close to one another.

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Praveen Kamath Sir, GHS Ankanahally, Somavarpet Taluk, Kodagu

Coin Challenge

Materials

Procedure

Discussion

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Praveen Kamath Sir, GHS Ankanahally, Somavarpet Taluk, Kodagu

Magical Wand of Fire

Materials

Procedure

Discussion

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Praveen Kamath Sir, GHS Ankanahally, Somavarpet Taluk, Kodagu