A pure substance has properties that are constant throughout the whole sample. This means that a pure substance will have a constant appearance, colour, density, melting point and boiling point throughout the sample. ... This horizontal flat line part of the graph is typical of a pure substance.
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Answer:
constant
Explanation:
A pure substance has properties that are constant throughout the whole sample. This means that a pure substance will have a constant appearance, colour, density, melting point and boiling point throughout the sample. ... This horizontal flat line part of the graph is typical of a pure substance.