Question

What is one characteristic of a sample of matter that indicates it is a pure substance?

A)It can be separated using by a physical means, such as filtering.B)The components in a pure substance do not have to be in definite ratios.C)If the composition of a sample varies, the sample is a pure substance.D)If the composition of a sample is fixed, the sample is a pure substance

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Answer 1

D

Step-by-step explanation:

If the composition of a sample is fixed, the sample is a pure substance. According to the law of definite proportions (constant composition), components of a pure substance must be in definite ratios regardless of the source.