[Catalist] Full proof lesson on Isotopes, Decay and Half Lives

[Stephen Treloar]

Microwave popcorn works well and better than M and Ms as it isn’t just an edible experiment, the popcorn decays...and at a remarkably constant rate (my HB12 class did it last lesson and the “mystery bag” I did after they had graphed their, only, 3 data points they did got bang on, no pun, what I did it for in the interpolation).
I get them to do 1.30, 2.00 and 2.30 - try first in case powerful microwave will have it all popped in that time. Then my mystery one was 1.50 and that’s exactly what they got.
No experiment sheet, sorry, as I get them to design it from the basic idea with controlled variables and method.
Lots of good discussion on how the model relates or doesnt to C14 and what is what (eg unpopped corn is C14 etc).
And....then you eat the experiment....
Need popcorn, bowls for counting (popped and unpopped - then they graph the % popped at each time).
A good un....and has rarely failed to get within a couple of secs for the mystery one of what it actually was.

Enjoy!

Sent from my iPad



Stephen Treloar
Head of Senior School

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On 21 Oct 2018, at 7:24 pm, HARRUP Linda [Byford Secondary College] <Linda.Harrup at education.wa.edu.au<mailto:Linda.Harrup at education.wa.edu.au>> wrote:


Hi all,


I have a Year 9 class who are difficult to engage with theory and many have low literacy. Looking for any activities which can be differentiated to have very simple instructions. Am already doing the MM's activity but I still need hands-on, easy to de-code instructions that address isotopes and types of radiation. Have looked at the ANSTO stuff but will still need to rewrite much of it into simpler instructions. Would appreciate all ideas.


Thank you in advance for any help people can provide.


Linda Harrup

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