Candles and Oxygen

In addition to any fire turns living creatures need oxygen
through these exciting games or we can prove that the fire needs air.

Materials and tools:
1. candles,
2. plates,
3. glasses,
4. matches,
5. dyes.
6. estimated cost of $ 12.5

Procedures:

1. First you turn on a candle and place on plate, then take the glass and close the wax using the glass
2. See what happens .. yes ... the candle outages.
3. To enliven the atmosphere if done in class before the candles on the lid invite students to do hipoitesa with questions.


After the experiment above, we proceed with the following experiment in which we can prove that there really air out when the candle of life.
Still with candles and dishes before, the input of water into the dish, give it a little dye to facilitate observation. Turn on the candle, and then do the same experiment with the above, observe what happens .... and ... .... water is sucked into a glass dish.

Rising water in a glass to prove that that air is lost because it is used in the combustion process so that the empty space is replaced by water.

Naked Egg

Ever see the contents of the egg without breaking?

nah through the following experiment where you can see how to view the content without breaking eggs .. how easy ..

egg naked let's get started:

Tools and materials:
1. eggs
2. glass
3. citric acid or vinegar

Procedure:
1. Fill glass with water until half full.

2. Add 2 tablespoons of citric acid and stir until dissolved

3. Enter a quail egg into a glass and let some time

4. This experiment can also use the vinegar solution eat

Oooo .. What happened ..

Outer skin to peel eggs and turn into white.

Let's find out yes ...

Egg shell is made of a substance called calcium. This substance will change when mixed with citric acid. The result is carbon dioxide gas. That is why you see no bubbles in the glass. Gas is more and more. Because it is lighter than water, gas moves upward, lifting egg.

Change starts from the outermost egg. That is why the skin with brown spots off first. As a result, the egg into the net. If the egg continues to be soaked, then the skin will come off. well now you try to soak the egg task longer what will happen.

Note: to facilitate a mixture of citric acid can be replaced with regular eating vinegar