Physical Science Extra Credit

Physical Science Extra Credit - Color Mixtures Demonstrates...

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Unformatted text preview: Color Mixtures Demonstrates Science Category: Chemistry Ages: Elementary Science, Middle School Science What You Need: Milk Food coloring Liquid dish soap Dish-wide rim What To Do: 1) Pour milk into a wide rimmed dish, and let sit until it warms to room temperature 2) Place drops of different food coloring in the milk 3) Place two drops of liquid dish soap into the mixture Demonstrates scientific principles: Surface tension If you place a drop of water onto another surface, you will notice a sort of "skin" that hold the water into place. This is known as surface tension. In this experiment, the soap breaks the surface tension at that particular location, but the surface tension remains strong for the rest of the dish. This explains why the liquid disperses to other areas of this dish- due to broken surface tension. 1 Sucking an Egg in a Bottle What You Need: 1 hard-boiled egg, peeled 1 long-necked bottle 3 matches Demonstrates Science Category: Physics (Thermodynamics) Ages: Elementary Science (Adult Assistance Required), Middle School Science (Adult Assistance Required), High School Science (Adult Assistance Recommended) Caution: Experiment MUST be done with adult assistance and supervision! What To Do: 1) Hard boil an egg and allow to cool. After the egg cools, peel off the shell. 2) Place a long-necked bottle on your kitchen table (or any table free from flammable debris) 3) Have an adult light 3 matches and place in the bottle (all matches at once, not one at a time) 4) Quickly put the egg on top of the bottle opening Demonstrates scientific principles: The matches heats the air, which causes it to expand. When the matches extinguish, it causes the air to contract as it cools. A lower pressure is created within the bottle, than on the outside. The pressure outside the bottle causes the egg to get sucked into the bottle. Heat causes most solids and liquids to expand, and cooling causes them to contract. Atoms or molecules within the solids vibrate more quickly with the increased heat. This causes the solid/liquid to become larges, and when cooled, become smaller. 2 Dancing Moth Balls Experiment: Making moth balls dance Category: Chemistry Ages: Elementary School, Middle School Materials Needed: Moth balls A glass Vinegar Baking Soda Water All you need for this experiment is a glass filled half full with water. Add a little bit of vinegar to your glass of water, about 1/3 or of a cup (60 ml), and one teaspoon (10 ml) of baking soda, then carefully stir the mixture. Drop a few moth balls into the glass and have your audience watch. As long as the surfaces of the moth balls stay fairly rough, they should begin to bounce up and down in the glass....
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This note was uploaded on 03/16/2011 for the course PHYSICAL S 110 taught by Professor Reese during the Fall '10 term at BYU.

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Physical Science Extra Credit - Color Mixtures Demonstrates...

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