When is a sample of amtter considered a pure substance?
Answer:
It depends on your requirements. For calculations usually chemists assume a standard is pure if it is greater than 98% pure. If you need to make a solution of something and it is less than 98% pure, you need to account for the discrepency. That's pretty standard, but again it really depends on your requirements.
If you are sure then it is considered as pure.
Elements and compounds are considered to be pure substances, because we know exactly what is in the sample.
Mixtures are not pure substances because they can be in any ratio.
A sample that contains only one type of molecule is considered to be a "pure" sample. (e.g. pure water would only contain H2O molecules)
When it consists of only a single Element.
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