Which of the following is not a pure substance

Which of the following is an element

A group of atoms that acts as a unit is called a(n)

Diamond is know for its

What is the density of a sample liquid that has a volume of 125 mL and a mass of 200 g?

Helium is used in balloons because it is

An object's volume can be found by dividing its mass by its

Which of the following is not a physical property of iron

Which property of a substance is not affected by physical changes?

The difference substances in a mixture

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