1. Physical and Chemical Properties
How to describe a substance

2. “Describes what the substance looks like”
Physical Property
Anything that can be observed or measured without forming a new substance
Examples include: colour, texture, taste, smell, state, malleability and ductility
“Describes what the substance looks like”

3. Name some physical properties of sodium
Colour:
Silver
State:
Solid
Texture: Smooth
Lustre:
Shiny

4. “How a substance behaves when exposed to another substance”
Chemical Property
Describes how a substance reacts with another substance when forming a new substance
“How a substance behaves when exposed to another substance”

5. Chemical Properties
Ex: Combustibility (how it behaves when exposed to Oxygen)
Reacts with water (how it behaves when it is placed in water)

6. Think About It! What physical and chemical properties do you see?

7. Physical and Chemical Properties of Sodium
Physical Properties:
Chemical Properties:
Very Reactive when exposed to water
Hardness: Soft
Colour: Silver
Not Reactive when exposed to oil

8. Quiz Is this describing a physical or chemical Property?
The water froze and became a solid
Physical Property - State
b) Metal rusted when it reacted with oxygen
Chemical Property – Slow reaction with oxygen
c) The silver necklace is shiny
Physical Property - Lustre
d) The sugar tastes sweet
Physical Property - Taste
When magnesium and acid are combined
they produce a new gas
Chemical Property – Magnesium reacts with acid

9. Types of Physical Properties
Qualitative
- a property that can not be represented by numbers
- a quality of a substance
How can you describe yourself without numbers?
- Ex:Hair Colour, Eye Colour, Smell, etc.

10. Types of Physical Properties
Quantitative
- a property that can be represented by numbers
How can you describe yourself using numbers?
Ex: Height, Weight, Density, Shoe Size, etc.

11. Physical and Chemical Changes
How can a substance change?

12. Physical Changes
A physical change is a change in the form or state of a substance
This includes:
- Substance dissolving in another
Sugar dissolving in water
Change of state
Boiling, freezing, evaporating
Cutting into pieces

13. What happens to salt when you put it in water?
Salt dissolves in water to create salt water

14. Is dissolving a physical or chemical change?
Can we get the salt back?
Has the salt and water changed into a new substance?
Let’s see!

15. The Bolivian Salt Plains
What you get when salt water dries up
Salt is separated from the water

17. How do I know it’s a lake?
All of this is coral!

18. Chemical Changes A chemical change is the formation of a new substance
Ex: Burning a piece of wood produces carbon dioxide and ash (carbon)
2 new substances are formed

19. Clues for a Chemical Change
Colour change
brand new colour, not blue become less blue
Formation of a gas
Formation of a new odour
Formation of a precipitate (solid created from liquids)
Formation of light or a change in heat

20. Let’s take a look at some physical and chemical changes!!!