1. Physical properties of matter

2. Physical Property*: can be observed or measured without changing the matter’s identity.

3. Examples of physical properties
Magnetism
Ability to conduct electric current
Strength
Flexibility
Color
Shape
Odor
Weight
Volume
Texture
State
Density

4. Density*: the amount of matter in a given space, or volume.

5. A golf ball and a ping pong ball have similar volumes, but a golf ball has more mass than a ping pong ball does so the golf ball has more density. Density is a physical property.

6. Solving for Density: Density = Mass Volume

7. Densities of Common Substances
Density(g/cm )
Density (g/cm )
Helium (gas)
Zinc (solid)
7.13
Oxygen (gas)
Silver (solid)
10.50
Water (liquid)
1.00
Lead (solid)
11.35
Pyrite (solid)
5.02
Mercury (liquid)
13.55 3 3

8. A block of pine wood has a mass of 120 g and a volume of 300cm
A block of pine wood has a mass of 120 g and a volume of 300cm. What is the density of the wood? Will this block of pine float in a pool of water? Why or why not? 3

9. Answer: 0.4g/cm It will float because it is less dense than water 3

10. A sample of metal has a mass of 3,623 grams and a volume of 508 cm
A sample of metal has a mass of 3,623 grams and a volume of 508 cm. What metal is it? 3

11. Answer: Zinc

12. Physical Change*: a change that affects one or more physical properties of a substance.

13. Examples of physical change: Freezing water to ice
Ice is still water
Sanding a piece of wood
Saw dust is still wood
Dissolving sugar in water
When water is evaporated, the sugar remains

14. More examples:
Breaking
Melting
Freezing
Cutting
Crushing
Dissolving

15. Physical changes do not change the identity of the matter involved
Physical changes do not change the identity of the matter involved. A stick of butter can be melted and poured on popcorn and still be called butter. Although the shape has changed, butter is still butter.

16. What physical property do the following substances have in common
What physical property do the following substances have in common? Water, oil, mercury and alcohol?

17. Answer: They are all liquids

18. Observe your sugar cube
Observe your sugar cube. Write down three physical properties you observe.

19. Write three things you could do to the sugar cube to cause it to undergo a physical change.