1. Chemistry –Pure substances
Grade 9

3. Made up of ONE TYPE of particle.
Elements
Made up of ONE TYPE of particle.

4. Periodic Table All elements are found arranged on the Periodic Table.
There are between naturally occurring elements.

5. Classification of the Elements
Three Major Groups
Metals
Non-Metals
Metalloids
What do you notice?
Most of the elements are metals and are found on the left side of the periodic table

6. Are all Solids at room temperature except Mercury which is a liquid.
Properties of metals
Are all Solids at room temperature except Mercury which is a liquid.

7. Properties of Non Metals
Most are either gases or solids. One exception is Bromine which is a liquid.

8. Properties of the Metalloids
Metalloids have properties in-between metals and non-metals. They Sit on what looks like a “staircase” on the periodic table.

9. Compounds
Are Pure Substances made up of two or more different types of particles in a definite ratio
Example Water is made of the elements Hydrogen and Oxygen combined together in the ratio of 1 part Oxygen, 2 parts Hydrogen. Compounds are represented by a formula such as H2O.

10. This diagram represent the compound
Copper carbonate. Copper carbonate is made up of 4 different elements
Copper – 1 atom
Carbon - 1 atom
Oxygen - 3 atoms
The formula is written
CuCO3

11. Copper sulfate = 1 atom of copper 1 atom sulfur 4 atoms of oxygen
Formula = Cu SO4 O Cu O S O O

12. H2 O What does this mean? Symbol for the element Oxygen.
Symbol for the element Hydrogen H2 O
The small number here means there are 2 atoms of Hydrogen
No small number here means there 1 atom of Oxygen

13. Rules Metal goes first in the compound if it is present.
Hydrogen goes first if there is no metal
CuSO4
H2O