Hello 5/6C and welcome to my speech about why water expands when it freezes.
The normal thing for liquids to do when they freeze is shrink. If you heat something up it vibrates more so it expands. But water is a bit different because of the way the atoms are arranged. If you look at water molecules it looks like the head of Mickey Mouse because of the two hydrogen atoms being his ears and the oxygen atom being his face. The oxygen atom is slightly negative and the hydrogen atoms are slightly positively charged, so water molecules tend to stick together forming what are called hydrogen bonds. Here is my diagram showing exactly what the molecules of water are.
Because of the shape of the molecule, the way water molecules tend to link together is actually a very open structure with big holes. That means, there’s quite a lot of extra empty space. When water freezes it releases energy because lots of extra strong bonds can be made. But it does take up more space. And that’s why water expands when it freezes. Thank you for listening to my speech and I hope you learnt something new.
During my preparation of my speech I faced some challenges, they were finding facts and researching, creating a good, well though out structure and creating small que cards.
Some strong points about my speech were that I had interesting facts, a clear, big prop and a loud fluent voice.
Some work habits I could have used were to practice, when you make mistakes keep on going and i could have thought about making my speech overall as good as I can.
Some subjects I could implement my skills of speaking and listening could be science if I’m told to get up and explain something or any other subject.
5 things I saw done really well were that people practiced a lot and memorized most of their speech. I saw that people researched a lot and put it all into a 2 minute, well spoken speech. Also I saw that people had clear props that they used really well in explaining whats happening in their speech.
3 things that should try to be avoided are messing up your que cards, not practicing enough and not being fluent and clear.
3 things I could try next time are to practice a lot more, research more and add more in so it will be long enough.