We learn from each other:

Experiments from our Online Laboratory

Material: a jar,water,oil,food colouring, effervescent tablets or bacing soda

First, fill the jar with 1/4 water.Add food color (watch while sinking in water).Then add the oil to fill the jar.Finally, add a few pieces of effervescent tablets that are broken

How it works?

When you add effervescent tablet , the carbon dioxide that is produced rises to the surface bringing water and food colouring along with it. When the carbon dioxide is released at the top of the bottle, the water and food colouring sink back down because it is more dense than the oil. 

Lava lamp

PU Naša radost, Serbia

Material: a glass, water, liquid soap, a straw and sugar.

 Fill the glass to half with water. Put some liquid soap and we'll mix it. Now You can put a straw in the glass and blow. Bubbles are formed, but they quickly burst. Now we'll put two teaspoons of sugar, we'll mix and we'll make bubbles again.

Observe what will happen. Now the bubbles do not burst so fast and they get bigger. Why this happens?

Because sugar makes the walls of the bubbles stronger.

Soap bubbles

Dora Gabe, Bulgaria

You need candle, one ballon filled with air and one with water

first you light a candle and then put a first ballon above the candle. The ballon goes POP

Then you put the second ballon and observe what is happening. 

In the first case the ballon goes pop because the heat from the candle make the ballon worm and also the air in it, so it expands and then goes POP.In the second case the ballon doesnt go pop, because the water inside the balloon doesn"t alow the ballon to heat.

Ballons and candle

Biseri, Serbia

Necessary materials: a high glass, a fresh egg, 4 spoons of salt and water. First fill the half of the glass with the water, then put the egg into the water. The egg goes down.

Next, take the egg out of the water, mix the 4 spoons of salt until it is completely dissolved and put the egg one more time. The egg floats.

Why? An egg sinks in salt water as salt is denser as compared to fresh water

The egg dance

The fan, Poland

PU "Naša radost", Serbia

Our favorite experiment:

The gost writing

Necessary materials: a bowl of water, 2 sheets of paper, crayons or ballpoints.

 One sheet of paper should be submerged by the water. Then, we put this wet sheet of paper on the table. Finally, we cover it with the dry sheet of paper. On the dry sheet of paper we write the message or do some drawings. Then, we have to wait until the wet sheet of paper gets dry. The writing or drawings we can see now is going to vanish.If you want to read the message, the sheet of paper should be submerged by the water one more time.

Why is it happening?If you submerge the sheet of paper by the water, it gets wet and transparent as well. When you write or draw on the wet sheet of paper covered with the dry one, the fibres of the paper are compressed. Thanks to compressed fibres, the writing or drawing is getting dark and you can see it until the sheet of paper is wet.

Kindergarten "The fan", Poland

Our favorite experiment:

"Ear drum"

Necessary materials: large bowl, plastic wrap, rice, metal pan, metal spoon

 1. Tear off a piece of plastic wrap big enough to cover the top of the bowl. Secure the plastic wrap and make sure that is very tight. 

2. Pour one spoon of uncooked rice on the wrap. 

3.Hold the metal pan in the air and place it next to the bowl. 

4. Take the metal spoon and bang on the metal pan like a drum and watch what happens to rice. 

Why is it happening?  The rice moves and jump around because of the sound waves that are caused by spoon hitting the pan. The sound waves travel trought the air and when they reach the plastic wrap it vibrates causing the rice to move. The sound waves are also what allow us to hear the noise of the spoon hitting the pan. 

"Dora Gabe", Bulgaria

Our favorite experiment:

"Magic Flowers"

Necessary materials: 3 white flowers, 3 food-colourings for pastries, 3 tall glasses. 

1. Fill the glasses with water. Dissolve the paint in the water.

2. Put the flowers into the water. Wait until the next day.

What is happening? The flowers are coloured!

Why is this happening? Many small tubes pass through the stems of the flowers, which carry the water to the blossom.

Kindergarten "Biseri", Serbia

Our favorite experiment:

"Snowstorm in the jar"

Materials: a jar, baby oil, cup of water, spoon, white paint, Alka salcer, optional: blue food coloring

1. Fill the jar with the 3/4 of the way with baby oil. Set this aside. 

2.In a plastic glass combine one spoon of the white paint with one cup of water. Mix until paint is dissolved. This will essentialy give you white water. 

3. Once mixed pour the white water into the jar leaving little room at a top. Waint for the water to settle at the bottom of the jar. Once the water is settled it is time to make the snow storm.