Question

Which of the following is true about pure substances?
A.
A pure substance has the same chemical properties throughout.
B.
A pure substance can only be made up of one kind of atom.
C.
A pure substance can always be separated by physical means.
D.
All pure substances are unable to be separated by any means.

Answer 1

Answer:

A.pure substance can only be made up of one kind of atom.

Answer 2

Answer:

elements and compounds

Explanation:

pure substance means a substance which is made up of only one kind of particle or only same type of compound.

Hence element contains only 1 type of atoms

and compound

Example:

H2 is made of only hydrogen atoms

hence it is element

H2O is made of 2 hydrogen atoms and 1 oxygen atom