Last updated
22 February 2018
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Purity of substances.
How to find if something is pure
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very useful
Empty reply does not make any sense for the end user
Excellent piece of work easily adapted, according the level of the pupils :-) Thanks
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Thanks you for preparing and sharing. Really useful and to the point.
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Thanks for sharing - very eye catching and concise.
Empty reply does not make any sense for the end user
Empty reply does not make any sense for the end user
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