Introduction to Chemistry

1
Introduction to Chemistry

• Part - I
• The Discipline of Chemistry

2
Joesten,Essentials,Saunders, 1993, 3
3
Chemistry

• Study of the composition, structure, and
  properties of matter, the changes which matter
  undergoes, and the energy released or absorbed
  during these changes
• Composition of matter refers to pure substances,
  elements, compounds, homo-and heterogeneous
  mixtures

4
Composition of Matter
Joesten, World of Chemistry, 2nd, Saunders, NY,
1996,25
5
Composition of Matter
6
Structure of Matter

• Types and relative locations of the component
  particles of a substance
• Types of particles are atoms, molecules
  (combinations of atoms), and ions (atoms bearing
  an electrical charge)
• Relative locations described by geometry - water
  molecule is angular with O atom in center, salt
  is cubic

7
Structures of Molecules
Angular
Linear
Angular
8
Structure of Salt
9
Properties of Matter

• Characteristics which may be used to identify a
  substance (melting point, etc)
• Types of properties are physical (can be
  observed without change in composition - melting
  point) or chemical (requires a change in
  composition - electrolysis of water)