Make batteries out of fruits or vegetables.
http://www.unit5.org/christjs/Potato%20Battery.htm
2006-07-17 04:09:48
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answer #1
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answered by Norm 5
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Here is a cool baking soda vinegar experiment that also can educate you on the dangers of confined spaces (you don't need to do that last part necessarily).
You need:
baking soda
vinegar
3 (glass) glasses
a small candle
Line up the three glasses in a row
Place the candle in the third glass and light it (the flame must be below the rim of the glass)
Put baking soda in the first glass, add vinegar so the glass is about 1/3 full and watch all the bubbles form. (quickly proceed to next step)
Pick up the first glass and make a "pouring action" into the second glass (don't transfer any liquids or solids...the pouring should be invisible).
Pick up the second glass and make a "pouring action" into the third glass. The candle should be snuffed out.
How does it work? Carbon dioxide bubbles are one product of the acid-base reaction of vinegar and baking soda. Carbon dioxide is heavier than air, and is somewhat contained in the glass after the reaction. The pouring action actually pours CO2 into the glass, displacing the oxygen and nitrogen there. Since the fire needs oxygen to keep burning, the CO2 will snuff it out.
Confined spaces are DANGEROUS because they may collect gases that are heavier than air, displacing oxygen, and leading to a quick death. This is why you need to have someone else with you to pull you out if you collapse. While you can go without oxygen for 4 minutes or more if you hold your breath, the act of breathing in an atmosphere with no oxygen in it strips the oxygen from your system, leading to peril in just tens of seconds.
2006-07-18 14:10:15
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answer #2
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answered by primenumber 3
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Chromatography experiments always work well. Get a jar and put about a quarter of an inch of water in it. Cut a piece of paper into long strips. On one end of each piece, make a mark using a marker, ink pen, etc. Use different colors on different stips. Make sure that where you mark is about 1/2 inch from the bottom of the strip so that the mark will not be in the water when you stick the strips in. Put the strips in. Take the stips out when the water has reached about 1/4 to 1/8 of an inch from the top of the strip and look at all the colors!
2006-07-17 12:54:35
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answer #3
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answered by q2003 4
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My sister is a science teacher. She did an experiment making batteries out of lemons by putting two different metals into them. She hooked up about 10 of them and was able to get a light bulb to glow.
Also, for younger kids, the old oatmeal box and nylon string telephone thing is pretty cool.
You can make a water rocked out of a 2 liter soda bottle and a tubless tire valve clipped onto a bicycle pump.
2006-07-17 11:10:52
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answer #4
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answered by Anonymous
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My favorite one for little kids is cornstarch and water. It's cheap and nontoxic. You can mix up a bowl of it (just enough water to give it a liquidy appearance) and let them watch while you swirl it around, then punch the surface to show that your fist doesn't go through the surface. You can talk about polymer enganglements, but they will just enjoy playing with it and seeing how they can move their fingers through it easily when they move slowly, but can't when they move quickly. A small amount of it can be poured out for each kid to play with. They can sometimes actually pick up a chunk of it, only to see it run through their fingers after a couple of seconds.
Toys make good science demonstrations. Barbies and matchbox cars both have color change designs that can be demonstrated and talked about. Toy cars can be run down different ramps to talk about friction. Balloons filled with air and helium can be used to demonstrate the properties of different gasses. A helium balloon could be placed in the refrigerator or freezer, then removed to show how the gas volume changes with temperature.
2006-07-17 15:33:20
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answer #5
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answered by chemist_trace_analysis 1
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Hmm... for a 2 year old, vinegar and baking soda will keep them entertained. For the 10 year old, just give them a book of matches or a lighter and they will LOVE science. Anything in between can play with bugs.
2006-07-17 11:08:52
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answer #6
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answered by Vengeful_Hippie (AM) 6
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Science for a two year old? How about teaching the basics first? Maybe the colors and some spelling?
2006-07-17 11:09:20
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answer #7
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answered by Pumpkin Head 4
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Nuclear Fission.
2006-07-17 11:41:22
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answer #8
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answered by Grant H 2
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paper chromatography - coffee filter and black crayola marker. put heavy dot near bottom and rest strip so 1 end is in water. as water goes through dot can see what the black ink is made up of (normally blue, green, red)
baking soda and vinegar - self explanatory
2006-07-17 11:09:33
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answer #9
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answered by shiara_blade 6
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Go to the Nasa website, they have loads of little things that you can probably do.
2006-07-17 11:08:28
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answer #10
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answered by Anonymous
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