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What is a substance that cannot be separated into simpler substances by physical or mechanical methods such as filtering, boiling, or sifting?

A crystalline solid
A sublimation
A pure substance ••
An amorphous solid

Correct me if I'm wrong

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  1. You are correct :)

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  2. I agree

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  3. What is the flipping answer.

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  4. A crystalline solid

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  5. what is the eeefing answer.

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  6. A crystalline solid

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