Y6 grow microbes

In science year 6 have been investigating microbes. We found all sorts of microbes lurking around school. We used cotton buds to swab handles, bannisters, pond water, specs, etc and pressed the buds onto plates of agar jelly. We left one section of the plate with nothing added. This was our ‘control’ and acted as a comparison.

Here are our plates of nutrient agar after two weeks.

Yuk!

Now you know why were always on at you to wash your hands before tea!

Dry Ice Fun on Open Day

Year 6 (and some parents and visitors) had a dry ice demonstration by Mrs Angell and then got a chance to have a go themselves. We learned that dry ice is solid carbon dioxide and is desperate to get back to being a gas – which is does with interesting effects, like making floating fog, pouring clouds, screaming spoons, giant bubbles and soap monsters. Here we are at work. (OK, play.)

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8DP finish off the dry ice in the last lesson of the day. Four dry ice demos today and Mrs Angell needs a strong cup of tea! (Will somebody take my prep tonight?!)

Year 7 generate their own electricity

Year 7 are coming to the end of a topic on renewable energy resources, and today we found out how generators actually work. We know that turbines drive generators to make electricity, but how?

Its all about magnets and coils of wire. Did you know that if you move  a magnet near a wire you can make the electrons in the wire move – and moving electrons = electricity! So that’s what we did. We moved magnets inside coils. We tried big and small magnets, thick and thick wire, lots of coils, coils round things, bare coils… and we measured how many milliamps of electricity we could generate. The winners were  Tom, Rebecca and Izzy, with a massive (OK, modest) 0.47 milliamps of current. Here they are working on their challenge.

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Year 8 Set fire to food

Year 8  spent the morning burning food to calculate the energy content. We found that a piece of rice cake had far less energy in than the packet said! We think this is because are experiment wasn’t that accurate and lots of the energy was lost as heat in the surrounding air. It was fun though, we filled the lab with cooking smells (and burning smells) just before lunch.

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Next lesson we tested food to see if it starch in in. We used iodine, which turns starch  black. We all guessed there would be starch in rice and bread, but some students were surprised to find starch in carrot and cucumber skin, and none at all in peaches, milk, cheese or grapes.

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Year 6 Hurry up jelly!

Year 6 are investigating dissolving. Here they are trying to find out if jelly dissolves faster if you chop it up into small bits or not. It was very sticky and the temptation to drink the jelly was almost too much for some to bear.

We had to keep our tests fair by keeping the same temperature and volume of water and by stirring them the same amount.

We also planned a second test to find out if hot water helps dissolving. It does!

Here we are busy with our dissolving experiments:

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We too are Iron Men

and women.

Year 8 used an easier route to Iron Man status. We used an extra strong magnet to extract the iron from cornflakes. Having crushed and dissolved the cornflakes in hot water in a ziplock bag (with no major spills this year, no mean feat!) we dragged a magnet over the top and saw a little trail of iron following the magnet like tadpoles….

A-MAZ-ING. You eat iron every time you have your cornflakes. It’s good for your blood as it helps the red blood cells collect oxygen for respiration. That’s what gets the energy from your food, without which, there would be no iron men at all!

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