Tuesday, June 16, 2009

Experiment Telur&Bunga Berwarna

Posted by Zurin Zakarya at 11:43 AM
Lepas Saya Dengan Anak Sedara Saya..Syok Tengok Channel Astro TVIQ.
Saya Nak Masukkan Dua Experiment Yang Saya Tengok..
Sangat Menarik..

Colored Flowers
Materials you will need:
• Water
• Scissors
• Food Colouring
• Jar, Plastic Cup or Test Tube
• A Flower (light coloured-white carnation) or Celery Stalk (with leaves)
1. Fill the cup with water.
2. Add a few drops of food colouring
3. Cut the end off the stem (stalk)
4. Put the flower in the water

Watch and in time the food colouring will be sucked up the stem along tiny tubes (called vessels) and the petals of the flower will start to change in colour.

Another way to try this experiment is to get a flower with a long, thick stem (or a celery stalk with leaves) and slit it carefully from the bottom and put one end in separate test tubes (with different food colourings). Your flower (or celery) should have petals (or leaves) in two different colours.

Did you know that plants need water to live? As well as absorbing water from the atmosphere (air) through their leaves, they suck water up through their stems. If you used the celery stalk for the above experiment you could cut the stalk and see that the little holes inside are coloured.

What you need:
* 1 egg (hard boiled is less messy if you accidentally break it, but you can use a raw one)
* 1 cup vinegar
* clear jar or glass
* Pour 1 cup of vinegar into jar
* Add the egg
* Record what you see (bubbles rising from the egg)
* Leave the egg in the vinegar for one day.
* Remove the egg and feel it.
* Record your observations (the egg shell will be soft)
What happened:
Eggs contain something called "calcium carbonate". This is what makes them hard.

Vinegar is an acid known as acetic acid.

When calcium carbonate (the egg) and acetic acid (the vinegar) combine, a chemical reaction takes place and carbon dioxide (a gas) is released. This is what the bubbles are made of.

The chemical reaction keeps happening until all of the carbon in the egg is used up -- it takes about a day.

When you take the egg out of the vinegar it's soft because all of the carbon floated out of the egg in those little bubbles.

Leave the same egg sitting out on the table for another day.

Now feel it again.

It's hard!



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