
By Ruby and Mum.

At the beginning of the year we counted how many seeds were in a sunflower and were quiet amazed at how many there were. We were making pumpkin soup one day and decided to find out how many seeds were in the pumpkin. First we all estimated / guessed how many we thought were in it.
Ruby 204 seeds
Dad 464 seeds
Mum 521 seeds
Oliver 488 seeds
Tom 100 seeds
We scooped the seeds out with a spoon and then picked out the rest with our hands. They were very slimy. We put them into ice cubes in groups of 10 to count them. We had 366 seeds altogether.
We made our pumpkin soup and had it with bread for lunch. It was yummy.
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What you need:
What to do:
What We Saw:
The first time we did it, we made it too stiff and it just broke into crumbly bit. The next time we did it we added the borax slowly and watched it as it slowly started to become sticky. It was amazing to watch as the mixture became more and more gooey. We got it out and squished it between our fingers. I was loads of fun.
What happened:
The polymers in the PVA reacted / bonded with the Borax (sodium bonate).
Written by Mummy and the Kids

The bottle sort of exploded – the cork came off and the bottle flew up in the air like a rocket. It was very exciting.
Conclusion:
There was a chemical reaction between the vinegar and bicarb soda. There was so much pressure in the bottle that the cork blew off and the bottle flew up in the air.
Written by Oliver
got to 100 really quickly and still had lots to go. Ruby changed her estimate to 380 and Oliver changed his to 510. We kept picking the seeds out. Soon we had over 300. We eventually finished and we had 464 seeds in the sunflower. Oliver was the closest. We were amazed that there were so many. We have kept the seeds to plant later this year.
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