Irreversible Change

irreversible change

Irreversible Change
This is a Yr 6 topic that covers the science of combustion, and the fire "triangle" but is often taught without using real fire - why?
In this activity we selected a range of natural and man-made materials, and tested them over an open fire. (It didn't need to be a bonfire! just a small one...) and we used long tongs to test each sample.
The children were fascinated, and asked some very pertinent questions about how the different hard material samples burnt and the different smells they emitted. They were also very interested in way that different fabrics burnt or just melted, or even self-extinguished! .....all provoked some good scientific thinking.
Can anyone add any more ideas to extend this activity further?
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