Question

Which of the following is a pure substance? Pure gold, pure milk, pure water, pure seawater, pure sand. And how do you know?

Answer 1

Pure substances are made of almost the same materials and have the same properties such as: Water, Sugar, Salt, Nitrogen Gas, Iorn, Carbon and Oxygen Gas.

Answer 2

the one that is a pure substance is : Pure Gold

The other substance couldn't be categorized as 'pure substance' because they don't have definite and constant composition

hope this helps