Question

why is the conversion of chalk stick into chalk dust a physical change?​

Answer 1

The conversion of chalk stick into chalk dust is a physical change because both the chalk stick and the chalk dust are just the same substance, only their size is different. No new substance is formed during the conversion of chalk stick into chalk dust.

Answer 2

The reason is that

when a chalk stick converts into chalk dust, the physical properties like shape or size only change and not chemical properties like state, colour or temperature...

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