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Biology, 20.10.2020 05:01 abdulalghazouli

12. A student has a brand new pencil with a mass of 120g. One week later, after sharpening it a few times, the pencil becomes shorter and it's mass is now
only 90g. Is this an example of a physical or chemical change?
Where is the other 30g of mass from the pencil? Be specific/give details.

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