Welcome to our blog! We are the children from 2KM and 2KJ at Leopold Primary School in Victoria, Australia. There are 45 of us and our teachers are Mrs Kathleen Morris and Miss Kelly Jordan. We used this space to share all the great things that happened in our classroom in 2011.
To do this experiment we needed a glass jar, spoon, vinegar, bi-carb soda and currants.
The procedure of the experiment was:
1. Pour some vinegar into the jar.
2. Drop the currants into the vinegar and stir.
3. Add a teaspoon of bi-carb soda to the vinegar.
4. Stir and watch what happens.
The aim of the experiment was to observe and explain the chemical reaction that took place.
This is a video of our experiment. Look at the chemical reactions caused by the bi-carb soda and vinegar.
Why did this happen? Bi-carb soda causes a chemical reaction with vinegar producing a gas called carbon-dioxide. The bubbles stick to the currants, floating them to the top. When the currant hits the surface, the bubbles on the top pop so they sinks again.
The reason why the currants floats to the top is because the bubbles stick to the sides of the currants and make the currant more buoyant. Buoyant means that something floats more easily. The bubbles make the currant float the way a life jacket makes a person float.