1. The Physical Properties of Matter

2. Objectives: Identify six examples of physical properties of matter.
Describe how density is used to identify different substances.
List six examples of physical change.
Explain what happens to matter during a physical change

3. What is a physical property of matter?
A property that can be observed or measured without changing the identity of that matter
Ex: Color, odor, shape, size, volume, etc.

4. We use physical properties every day.
If your shirt matches your skirt (color)
If your book fits in your bag (volume)

5. More examples of physical properties
Thermal conductivity
Density
Ductility
State
Solubility
malleability

6. Thermal Conductivity
Definition:
The ability to transfer thermal energy (heat) to something else
Example:
Coffee in a special cup (poor conductor) to prevent heat transfer to our hands

7. State The form in which matter exists: solid, liquid, gas Definition:
Example:
Ice = Solid
Water = Liquid
Helium = Gas

8. The ability to be pounded into thin sheets
Malleability
Definition:
The ability to be pounded into thin sheets
Example:
Aluminum can be pounded flat to make aluminum foil

9. Ductility The ability to be drawn into thin wires
Definition:
The ability to be drawn into thin wires
Example:
Copper is used to make wires

10. Solubility
Definition:
The ability for one substance to dissolve into another substance
Example:
sugar dissolves in coffee

11. Density Mass per unit volume
Definition:
Mass per unit volume
Example:
Lead is used for fishing weights because it is more dense than water

12. More information about density...
Density = The amount of matter in a given space or volume
Density = m Mass
v Volume

13. More information about density...
Most substances have a unique density:
Water = 1.00 g/mL
Gold = g/mL
(See page 47 Table 1)
So density helps us in identifying substances
Moreover, knowing the density of a substance can tell you if the substance will float or sink in water.

14. If the density of an object is less than the density of water, the object will float.
If the density of an object is more than the density of water, the object will sink.

15. The Magic Triangle m
D V
Answers are expressed in g/m3 or g/cm3 or g/mL or g/L or kg/m3 etc.

16. A physical change is change that affects one or more physical properties of a substance.
Page 48 figure 6

17. More examples of physical change
Breaking of a bottle
Melting of an ice cube
Freezing of water
Cutting a piece of an apple
Crushing a can
Dissolving sugar in water

18. Matter and physical change
Physical change does not change the identity of the matter involved.
Example, melting a stick of butter.
-Although the shape and state of butter has changed, the butter is still butter!

19. Open your books page 49
Questions 1,2, 3, 4, 5, 6, 7, 8