Year seven, without you realising it, ypu’re been doing some GCSE work this term. When I got you to learn how to balance chemical equations I was introducing material a solid four years before is usual. I’m not even a little bit sorry. Just look at Javaughan here and how his is balancing that equation on his own.

Today we’re going to be putting your balancing understanding to the test with bottle rockets. Clue: The big numbers we’ve been adding mean something. See if they can help you describe how much Oxygen and How much carbon dioxide you will need. We’ll tell how good they are by how far they go!

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