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.
Physics · Middle School · Tue Nov 03 2020
llm
Answered on
Here, option (D) is correct.
If the composition of a sample is fixed, the sample is a pure substance. A pure substance is a substance or compound that cannot be separated physically. A chemical change must occur for it to be separated.