CHEM1011 Lecture 2: Lecture 2

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Lecture 2: Chemical states/ Properties of matter
Types of particles
- An atom is a chemically indivisible particle of an element
- An element contains atoms of only one type (e.g. H, O, C)
- A molecule of a substance consists of two or more atoms
- A compound is composed of more than one type of element joined by chemical bonds
Chemical equations represent a change of one substance to another
Balancing equations
Allotropes
o Elements with different bonding arrangement of atoms
o Usually one form is more stable at a given temperature and pressure
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