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.

Answer 1

D) If the composition of a sample is fixed, the sample is a pure substance.

Explanation:

A) It can be separated by using physical means, such as filtering.

Of course using physical means as filtration or crystallization we increase the purity of a compound, however sometimes impurities may remain dissolved in the solution or they may co-precipitate with the analysed sample.

B) The components in a pure substance do not have to be in definite ratios.

If the components in a substance do not have definite rations it means the the substance is not pure, it is a mixture of something.

C) If the composition of a sample varies, the sample is a pure substance.

If the composition of a sample varies, it means that different components in the substance are changing so it is a clue that the substance is not pure.

D) If the composition of a sample is fixed, the sample is a pure substance.

If the composition of a sample is fixed, and it can be determined and proven, the substance is pure.

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Answer 2

Answer:

The answer is D) on USA Test prep

Explanation: