To end our states of matter unit, 4B were set some challenges in which they had to think like a scientist. The children explored melting points using chocolate which did end up in their mouths. After that, we carried out two experiments. 4B had to discover why we add salt to paths in the winter and find out what Sodium Chloride (salt) does to ice? By trying to pick up ice with just a piece of string and salt in our ice pick-up experiment, we realised that when salt is mixed with ice it lowers the freezing point. Usually water freezes at 0° C, but when it is mixed with salt it lowers the freezing point significantly. That’s why we grit the roads with salt and a salt solution is used in de-icer. Everyone had a great time ice fishing. As super scientists, 4B then had fun getting messy with our corny goo challenge. We had to find out whether it was possible to walk on custard like the Brainiac’s clip we watched. Unbelievably, we found out that cornflour, which is a non-Newtonian substance, behaves like both a liquid and a solid. Wow! In the afternoon, we used our knowledge of solids, liquids and gases to create our own mini water cycles. According to 4B, it was the best day ever! We hope you enjoy watching our Science day movie clip. The children chose the music.
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