5. A hack-saw blade is heated at one end over a flame. How does the colour of
tip change? How can you get back its original colour?
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Answer: In Activities 1 and 2 above, you saw that paper and a piece of chalk underwent changes in size. In Activities 3 and 4, water changed its state (from solid to liquid, or from gas to liquid). In Activity 5, the hack-saw blade changed colour on heating.
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Answer:
Hold a hacksaw blade in a long and keep it on the gas stove. It turns red. Now cool the tip of the blade, you will get its original color.
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