Matter-Everything that has physical existence. Therefore, anything that has mass and takes up space.
How do we classify matter?
Is only one chemical substance present in the sample being considered?"
YES-Pure Substance No-Mixture
All pure substances can be separated into two categories by asking the question "Can the sample be further decomposed by chemical means?"
(Notice we are ignoring mixtures for the moment.)
YES- Compound NO-Element
If you have a mixture...Is the sample of constant composition?"
YES-Homogeneous Mixture NO-Heterogeneous Mixture
Alloy- a homogeneous metal mixture
Classify these as Element, Compound, Heterogeneous Mixture or Homogeneous Mixture.