The structure of matter

5 important questions on The structure of matter

What is a pure substance in chemistry?

one substance and consists of molecules that are all identical

What is a mixture?

when two or more substances are mixed

How and why do we use models for atoms?

they are too small for us to see them, we make a drawing or a 3D model, made of plastic, we can also make a 3D model on the comuter
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How did he describe a atom?

as a sphere, different kinds of atoms had different sizes and masses

What is a black atomms?

carbon atoms

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