Asked by Kris

Is "sharpening a pencil" more of a physical change than souring of milk, fermenting of grape juice or rusting of iron?

Thanks anyone!
Answered by DrBob222
definitely. Sharpening a pencil leaves the lead, the wood, and the eraser in their original formulations. The others you mention changes the composition of the milk, grape juice or iron into something else.
Answered by Kris
Thanks, Dr. Bob. So are new substances formed in a chemical reaction?
Answered by DrBob222
yes
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