1. PROPERTIES OF PURE SUBSTANCES
What is a pure substance?
Non-characteristic properties
Characteristic properties (physical and chemical)
Determining an unknown substance

2. What is a Pure Substance?
Substance made up of 1 type of atom OR 1 type of molecule
Mixtures are NOT pure substance
2 types
Elements
1 type of atom
Iron, oxygen,
Compounds
At least 2 types of atoms
Water, salt,

3. Non-Characteristic Property
A property that is shared by many substances
It does not allow you to identify it
Examples: mass, volume, temperature, color, shape.

4. Characteristic Property
A property that is unique to that one substance
Allows you to identify it right away
Examples: DNA, boiling point, density

5. Physical Characteristic Properties
Once the observation of the property is made, the molecular make-up of the substance remains the same
Examples: melting point, boiling point, density, solubility
See Table 1.30 on page 23
of textbook

6. Chemical Characteristic Properties
Once the action or observation is made, the substance is no longer the same, its molecular make-up has changed
Examples: burning, digesting, use of indicators
See Table 1.31 on page 24 of textbook

7. Determining an Unknown Substance
There are many tests that can be done to identify a substance which include:
Conductivity: if light of conductivity meter comes on
Malleability: ability to bend
Magnetism: substance is attracted or repelled by a magnet
Smell
Colour
Metallic luster: shine, all metals shine
Density
See tables on pages 23 and 24 of textbook