Water Experiments

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This presentation is part of the Comenius-Project WATER IN OUR LIVES. This project has been funded with support from the European Commission. This publication reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.

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Water in our Lives:

Water in our Lives Water Experiments 3 rd and 4 th Class Claregalway National School

We conducted a number of water based experiments in our class. These were based on dissolving and air pressure.:

We conducted a number of water based experiments in our class. These were based on dissolving and air pressure. Dissolving The Crusher

Dissolving:

Dissolving In this experiment, we wanted to see which materials would dissolve in water and which wouldn’t. We also wanted to investigate the difference between using hot and cold water when dissolving.

Materials:

Materials We split into 6 groups. Each group got a clear plastic cup, some water, a stirrer and one of the materials to be dissolved. We filled each cup with the exact same amount of cold water. We added the material to the water. We stirred the water for the exact same amount of time. Sugar Washing Powder Clay Powdered Jelly Coffee Sand 6 clear plastic cups Cold water Hot water S tirrers

Some photos!:

Some photos!

Our Results: :

Our Results: These items will dissolve (are soluble) in water. Sugar Washing Powder Jelly Powder Coffee

PowerPoint Presentation:

These materials do not dissolve (insoluble) in water. Clay Sand

Part 2 of this experiment – do materials dissolve faster in hot water? :

Part 2 of this experiment – do materials dissolve faster in hot water? We got 2 plastic clear cups. We filled them both with the exact same amount of water. One was hot and one was cold. We added the exact same amount of sugar to each cup. We stirred at the same speed.

The Result: :

The Result: The sugar in the hot water dissolved much faster than the sugar in the cold water. Materials will dissolve faster in hot water.

The Crusher:

The Crusher Our next experiment is called The Crusher. In this experiment, we wanted to show 2 things. How air pressure works. Contraction and expansion of air. We used water to show how air pressure works.

Materials:

Materials A bucket of hot water A bucket of cold water An empty clear plastic bottle A lid

PowerPoint Presentation:

First we put the empty bottle into the hot water. We left it there for 30 seconds. Next we took the bottle out and very quickly put the lid on tightly. We now held the bottle in the cold water. We watched to see w hat would happen.

The Result:

The Result When we put the bottle into the cold water, it began to crush in on itself.

Why?:

Why? There was nothing in the bottle, except air! When the b ottle was in the cold water, the air in it was cold. Air expands (gets bigger) when it is cold, so it filled out the bottle. When we took it out of the cold water we put the lid on so no air could escape. When we put it in the hot water, the air inside the bottle heated up. This air then contracted (got smaller). Because the air outside the bottle was greater than the air inside the bottle, it crushed the bottle. No more air could get in because the lid was on.

Pictures!:

Pictures!

PowerPoint Presentation:

The End!

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