Fair Testing

We have been learning how to run a fair test. Our favourite excperiment was making bottle cannnons.
We first put vinegar in the bottle and then baking soda wrapped up in a tissue.
We then put a cork on the top then walked outside and shook the bottle with our thumb on the cork. The mixture fizzed up and the cork flew off. This is because of the chemical reaction that occurred between the baking soda and the vinegar.