1.
Which of the following is an example of a pure substance?
A
Hydrogen
B
Salt solution
C
Sand and water
D
Air
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Which of the following is an example of a pure substance?
Hydrogen
Salt solution
Sand and water
Air
What is a pure substance?
A substance with only one type of molecule
A substance with a mixture of different molecules
A substance that can be separated into two or more components
A substance that is impure