Page 11 - Chemistry eBook
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Substance
SUBSTANCE: Matter that is uniform
• Substances are HOMOGENEOUS,
which means that each molecule is uniform throughout.
• This concept is referred to as FIXED/DEFINITE RATIO or FIXED/DEFINITE PROPORTION.
• There are two types of substances: 1. elements & 2. compounds
This is one water molecule
(two hydrogen atoms and one oxygen atom).
There are a few water molecules here, but each molecule is 100% identical to its neighbor. Each molecule contains two hydrogen atoms and one oxygen atom.
Substance means the matter is all the same.
Homogeneous: All homes have the same purpose
(to live in). Homogeneous means that the
matter is the same.
UNIT 1: INTRO TO CHEMISTRY © 11
