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

Thanks anyone!

  • Chemistry -

    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.

  • Chemistry -

    Thanks, Dr. Bob. So are new substances formed in a chemical reaction?

  • Chemistry -


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