Instructions:
1.  Fill the cup/bowl with some lemon juice.
2.  Put the dirty copper coins in the juice and let them soak for a few minutes.
3.  Remove the coins from the cup/bowl and place on the paper towel.

Oxygen in the air reacts with copper, making a copper oxide coating.  This is what makes copper coins dirty. The acid in the lemon juice reacts with the oxide and removes it from the coins – making them look shiny and new.  Start a coin jar and start saving.

Bobbing Raisins

Supplies:
A Clear Glass/Jar
Carbonated Drink (Clear)
A Handful (4-6) of Raisins
Instructions:
1.  Pour the carbonated drink into the glass/jar.
2.  Drop the raisins into the glass/jar.

Wait to see what happens to the raisins!!!

The bobbing up and down works because the bubbles of carbon dioxide gas in the drink are much less dense than the drink or the raisins.

Once the raisins start bobbing up and down, they will continue to rise and fall for about an hour.

-Raisins are denser than the carbonated drink, so they will sink.
-Gas bubbles attach to the wrinkles on the raisins.
-When the raisins are covered with bubbles they become less dense than the drink, so they start to rise.
-The gas bubbles start bursting and then the raisins become denser than the drink, so they sink again.

Three Layer Float

Supplies:
Oil • Cork • Coin • Water
Grape • Honey
Tall Clear Plastic Bottle
Instructions:
1.  Fill one third of the bottle with honey.
2.  Fill the next third with oil.
3.  Fill the last third with water.
 4.  Wait for all three liquids to settle.
 5.  Drop in the coin, grape and cork.
All three items (coin, grape and cork) end up in each of the three different fluids (honey, oil and water). Each liquid and item have different densities and stay in a separate layer according to its density.  The densest is at the bottom and the least dense is at the top.

Enjoy seeing the delight on your children’s faces as they discover the mysteries of science.
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