Thursday, October 12, 2017

Day 8 13 Days of Halloween: Bubbling Fun!

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Today we are talking about bubbling fun.  Chemistry is always fun at Halloween.  My kids always do this trick for their mad scientist area of their haunted house.  Simple and entertaining.

Clear Container

Vegetable Oil

Gel Food Coloring

Alka-Seltzer Tablets (Effervescent Tablets)



1.    Fill the glass almost full with vegetable oil.

2. Add 5-10 drops of gel food coloring.

3. Add 1 Effervescent Tablet.

4. Slowly pour about a teaspoon of water into the oil.  Give it a few seconds to react with the effervescent tablet.  Add more water if needed.

5. Observe the reaction.

How does this happen?

This is a great lesson in density and mixtures.  Water and oil do not mix.  Water is denser than oil.  Food coloring is water based.  It will mix with water, but not oil.  The gel food coloring is a little bit thicker, so it takes longer to mix with the water.  The gel food coloring sinks to the bottom of the oil.  The tablet is added.  Alka-Seltzer does not react with oil, but will begin to react with the food coloring.  When the water is added it increases the reaction of the Alka-Seltzer tablets.  Drops of water cling to the carbon dioxide gas produced and start to float up and down in the oil.  They then start to mix with the food coloring.  The colorful drops float up and down in the oil creating a fun display.

If you are using for a mad scientist table add some glow powder and a black light.  If you don’t have that you could drop a glow stick in to make it interesting.

Come back tomorrow for more 13 Days of Halloween.

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