1. Pure substances, properties

2. ✗ Matter Contain only one type of particle mixtures Pure substances
heterogeneous
homogeneous
compounds
elements
Suspension
Solution
Colloid ✗ ?

3. Contain only one type of particle
Pure substances
compounds
elements
At least two types of atoms, that have chemically combined
 Can be separated into constituent elements
Only one type of atom
(there may be more than one of the same kind!)
 Impossible to separate into other substances with chemical separation techniques.
Practice page 14 #
Hydrogen
Oxygen
Oxygen

4. Work book page 14 # 1
together

5. Periodic table of elements
name
Mendeleev listed elements according to their atomic weight. He realized that when he kept isting them with atomic wheight that after a certain number of elements there was a repetition in the properties of the element -> he started a new row.
Practice finding atomic number
Explain, in their book colours indicate state of matter
Atomic number
Atomic symbol
Atomic weight

6. Notes pure substances
Practice page 14 No2 and 3

7. Identifying pure substances:
Using properties that are specific to a substance or a small group of substances.
Characteristic Properties
Non Characteristic Properties:
All substances have these properties
Mass - temperature
shape - state of matter

8. Characteristic properties
1. Physical properties
2. Chemical properties
No change of the identity / nature of the substance during test process
During course of identification process substance reacts with another substance and will change
Who can help think of a physical property that might help me identify that this liquid here is water, without destroying the water.

9. Physical properties: Melting point
The temperature at which a solid becomes a liquid (or a liquid becomes a solid)
Melting point water:
0 °C
Melting point ethanol:
- 117 °C

10. Physical properties: Boiling point
The temperature at which a liquid becomes a gas (or a gas becomes a liquid)
Boiling point water:
100 °C
Boiling point ethanol:
78 °C

11. Physical properties: solubility
Maximum amount of solute, that can be dissolved in a given volume of solvent
Expressed in units of concentration  g/L, %m/v, %m/m or %v/v

12. Physical properties: density
Do they have the same weight?
air
water
steel
No!
Density = Mass per unit volume (in g/mL):
 I always indicate how much 1 ml of the substance weighs.

13. Notes on characteristic physical properties

14. Practice
1. A rock with the volume of 22 ml weighs 37.4 g; what is its density?
2. The mass of a plastic spoon 7.5 g and its volume is 3 ml; what is its density?
1.7 g/ml
2.5 g/ml
135.2 g
3. The density of silver is 10.4 g/ml. If a sample of pure silver has a volume of 13 ml, what is its mass?

15. Characteristic Chemical Properties
Help us identify a substance but may change the nature of the substance during the process. 
Ex: Reaction to litmus paper, Reaction to cobalt Chloride Paper, Reaction to limewater, Reaction to a glowing splint, reaction to a burning splint, reaction to an open flame.

16. Reaction to litmus paper
Can identify if a substance is acidic or basic.
Acid
Base

17. Reaction to cobalt chloride paper
Turns pink in the presence of water.
no water
with water
Water goes into the crystal and changes the color of the crystal from blue to pink

18. Reaction to limewater Turns Cloudy in the presence of CO2
CaOH2 – solution – CaCO3 precipitates

19. Reaction to glowing splint
Splint reignites in the presence of oxygen
Reignite fire in fireplace through blowing, hair dryer, bellows
A pair of bellows uses the same principal to reignite a fire

20. Reaction to burning splint
An explosion will occur in the presence of hydrogen.
Magnesium and acid in test tube plus match
Hindenburg in 1937

21. Reaction to an open flame
The color of the flame may indicate the presence of certain substances. K Na Ba

22. Notes characteristic properties