4th & 5th Class look at a couple of practical experiments as part of Science Week 2019.
Experiment 1: The pupils looked at how a simple Carbon Dioxide fire extinguisher works.
Firstly, baking soda was added to vinegar in a jug. This created a reaction where carbon dioxide was produced. Due to the fact that carbon dioxide is more dense than air, the carbon dioxide stayed in the jug for the most part (although it was not visible).
Pupils where then able to ‘pour’ the carbon dioxide onto a candle and extinguish the flame.
Experiment 2: Hot Water vs Cold Water
In experiment 2 the children observed how hot water is less dense than cold water. This was demonstrated by placing a glass of hot water on top of a glass of cold water. The hot water (which had green food colouring in it) stayed on top of the cold water (which was blue). To further prove the theory, we repeated the steps of the experiment but this time placed the cold on top of the hot water. In this instance, the cold water rushed downwards and mixed with the hot as the hot itself would have initially have been trying to rise.