_______ is anything that takes up space and has mass.

__________ is the quantity of matter.

Why are mass and weight not the same thing?

What is the difference between the three states of matter (solid, liquid and gas)?

_____ is a pure substance that cannot be broken down chemically.

More than 90% of living things are composed of what four elements?

Why are atoms important?

All of these are correct about the atom EXCEPT.

A _________ is made of two different elements.

A ________ is made of two atoms covalently bonded together

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