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An unknown, clear liquid is given to you in a beaker. You transfer some of the liquid from the beaker to a clean, empty test tube, and begin to heat it. Soon, you observe a vapour leaving the top of the test tube. With further analysis you discover that the vapour is water vapour. Eventually, all that's left are a few crystals stuck to the sides of the test tube. Was the original liquid an element, a compound, or a mixture? Explain

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cleverowl
A mixture because there was residue left at the bottom of the test tube and another substance that evaporated meaning that there was more than one thing in the test tube.
cottencandy242
A mixture because there was remaining  left at the bottom of the test tube and another substance that evaporated meaning that there was a lot more than one thing in the tube 

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