Simple science experiments?

Question

Simple science experiments?
need it for my demonstration tomorrow, experiments that are not messy and have simple principles like using only two objects things like that.

Answer 1

Here are some good ideas.

1- %age of oxygen in air:
You will need: candle, plate (one which can hold some water), and a transparent glass.
Process: Pore some water in the plate. Place the candle in its center and light it, now put the glass over the candle.
Result: after some time the candle will burn out. This will indicate that all the oxygen in the glass has been used. And as the candle burns out the water will rise inside the glass to compensate for the used up oxygen.

2- Air has weight:
You will need two balloons of same size, a physical weighing scale.
Process: fill both balloons with air and put them both in the scale one on each side of the scale. At this point the scale should be balanced in the middle. Now deflate one balloon, now the scale should tilt to the side with the balloon which has air in it.

3- Don’t know what to call it but its interesting related to brain.
You will need just a colored printer (don’t have this use color pencils), a few sheets of paper.
Process: On the first sheet write names of colors like green, blue, and so on you should write about 5-7 colors write their name with black in. On the second sheet write the names of colors in the same order as before, but this time write the names of colors in different colors like if you are writing green use blue color to write it, if you are writing black use red color to write it.
Now first give the first sheet (the one with colors written in black) to the participants and ask them to read aloud the names of colors as fast as they can. This will be easy. Now give the participants the page with colors written in different colors and ask them to say out the names of the colors in which the names of the colors are written, e.g. if you have written green in blue ink then the participants are supposed to say blue not green.
You will notice that the participants will start to read out the names rather then the colors in which they are written.

If you need more just visit the following link.
http://www.stevespanglerscience.com/experiments/

http://www.kidzone.ws/science/rainbow.htm