1. Introduction to Chemistry
SNC2DI/W

2. Organization of Matter

3. Physical Properties A physical property describes the substance E.g.
State
Hardness
Melting point
Boiling point
Odour
Solubility
Colour
Malleability
Ductility
Etc.

4. Chemical Property
A chemical property is how the substance reacts to form a new substance.
E.g.
How it reacts with acid
How it reacts with water
How it reacts with oxygen
Etc.

5. Physical Change
A physical change is when the original substance does not turn into a new substance but does change form.
E.g.
Ripping a piece of paper
Dissolving a salt
Melting ice

6. Chemical Change
When a substance changes from one substance into another, it is a chemical change.
E.g.
Baking soda in acid
Iron exposed to oxygen
Combustion

7. How to Recognize a Chemical Change
Clues that a chemical change has occurred.
A new colour appears
Heat or light is given off
Bubbles of gas are formed
A precipitate (solid) forms in a liquid
The change is difficult to reverse
E.g. 2H2(g) + O2(g)  2H2O(l)

8. Chemical Tests
You can use chemical change to perform a chemical test to determine if a substance is present.
Glowing splint used to indicate if oxygen is present
A burning splint is used to indicate if hydrogen is present
Limewater can be used to indicate if carbon dioxide is present
Cobalt chloride paper can be used to indicate if water is present
A flame test can tell which type of metal is present
Flame test for Li

9. Do you remember? WHMIS? MSDS?
Provides Canadian workers with the information on the safe use of hazardous materials in their workplace.
MSDS?
Material safety data sheet

10. Try These….
Classify each of the following observations as an example of either a chemical property or a physical property. [K]
Propane, leaking from a damaged tank, ignites easily.
Silver jewellery tarnishes (darkens) in air
Spilled oil generally floats on the surface of water.
What type of change is describes in each of the following? [K]
A loud pop is heard when a lit match is placed inside of a test tube.
Air is often blended into ice cream in order to give it a lighter quality.
Drain cleaners often produce a great deal of heat as they unclog drains. Is the action of the drain cleaner a chemical or physical change? [A]
Over time, crusty scales form on the heating coils inside a kettle. These can be removed by covering the coils with vinegar. As the scales disappear, bubbles of gas are observed. Does this method of cleaning a kettle represent a physical or chemical change? Explain. [A]

11. Credits http://mr.fusco.ca