Pure Substances- a sample of matter, either a single element or a single compound that has definite chemical and physical properties
Element- a substance that cannot be separated or broken down
into simpler substances by chemical means; all atoms of an element have
the same atomic number
Types of pure substances:
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Elements
Compounds
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Elements-
elements are pure substances that contain only one kind of atom- Has its own unique set of physical and chemical properties
- Has its own chemical symbol
- Molecule- the smallest of a unit of substance that keeps all of the physical and chemical properties that of the substance; it can consist of one atom or two or more atoms bonded together
- Diatomic elements- two of the same atom bonded together chemically
Pure Substances
-Some elements have more than one form
-Allotrope- one of a number of different molecular forms of an element
-Compounds are Pure Substances
Compound- a substance made up of atoms of two or more different elements joined by chemical bonds
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