Pure substances are (1)_______ in appearance. During boiling, the temperature of a (2)_______ changes at the start then it becomes (3)______. During melting, a substance melts (4)_____ within a short time.
To determine a (5)______ sample if it is a pure substance, you should test it using its boiling point; while if it is a (6)______ sample, its melting point is the best way to test.
In Enrichment A, the liquid A is (7)______ since it has a fixed boiling point while the water with salt is a mixture because it has a varying melting point.
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Clear, substance, high, into liquid
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