Science Projects

Topics: Ultraviolet, Carbon dioxide, Borax Pages: 9 (3590 words) Published: November 1, 2011
1. Dancing Raisins
Here's another quick and easy science experiment. All you need is a glass of clear soda, such as ginger ale or club soda, and several small raisins. Fill a glass with soda. Leave about ½ inch (12.5 mm) of space at the top. Drop the raisins in. Those tiny bubbles attaching themselves to the raisins are carbon dioxide (CO2) bubbles. The irregular surface of the raisins enables a lot of CO2 to accumulate. When enough gas bubbles attach to the raisins, they act like tiny balloons, giving the fruit enough lift or buoyancy to rise. The raisins should rise to the top of the glass and float on the surface. As the carbon dioxide escapes into the atmosphere, though, the raisins will sink. Then the whole process will repeat itself time after time — so the raisins seem to dance. 2. Growing Borax Crystals

The project doesn't require more than 24 hours to grow the borax crystals. Materials needed for this project would be a cup of water, string, wire, borax and food color. First of all, twist the wire into a shape (preferable, snowflake) suitable for growing borax crystals. Heat a cup of water in a jar. As the water starts boiling, heating should be stopped and the jar placed aside. Borax should be added to the water slowly, up to the point of saturation. In the mean time, the solution should be stirred continuously. The wire should be attached to a string and inserted in the saturated solution. In about 24 hours, borax crystals grow on the wire shape. A piece of pencil or other suitable object should be attached to the other end of string. This object helps in holding the string while the wire is inserted in the solution. 3. Inflating the Balloon

Take an un-inflated balloon and force the neck to open wide with the help of the middle and index fingers of both the hands. Ask someone to carefully drop in a few pieces of dry ice ensuring that it does not touch your fingers. Tie the balloon tightly and drop the balloon in a swimming pool. If you do not have a swimming pool close by, you can set the balloon aside or even drop it in a bucket, but the effects will not be as dramatic. When the balloon is dropped in the swimming pool, it will sink. But as the pieces of dry ice begin to sublimate, the balloon will slowly be filled with carbon dioxide and will start rising to the surface where it will float. If the quantity of the dry ice that was put into the balloon was more, then the balloon may even explode. 4. Magic Water

This experiment can be used to teach young students the difference between alkaline and acidic liquids. In a glass containing water and ammonia, add some universal indicator solution. The liquid in the glass will turn blue. Now add some pieces of dry ice. It will be seen that the solution gradually turns red. Next, add some more ammonia to the container. The liquid will turn blue again. This is because ammonia is alkaline in nature while dry ice combines with water to produce an acidic solution. 5. Smoking Water Fountain

This experiment can produce good visual effects. If you do not have access to a small water fountain around you, can use a small bucket or tub to produce the same effect. But you have to ensure that the water is warm. So, if you are using a water fountain, you can carry out this experiment on a warm summer day when the water in the fountain is tepid, else you will need a bucket or a tub. To begin the experiment, you need to first pound the dry ice into small pieces. To do so, place the dry ice into a plastic packet and tie the packet up firmly. Now pound the packet with the help of a hammer. Once the dry ice has broken down into small pieces, scatter a few pieces in the warm water. You will immediately see white smoke rising from the water. This is nothing but condensed carbon dioxide. The quantity of smoke will depend on how hot the water is and also on the quantity of dry ice put in the water. For constant smoke, you will need somebody to constantly replenish the dry ice...
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