1. Unit 3-1
Physical and
Chemical Changes!

2. Physical Change
A physical change is when an object undergoes a change that does not alter their chemical properties.
Examples:
Cutting or breaking an object
Any phase change (solid, liquid, gas)
Adding food coloring to food
Biting an apple

3. Chemical Change
A chemical change is when a substance reacts with another substance and a NEW SUBSTANCE IS FORMED!
Examples:
Rusting of iron or tarnishing of silver
Cooking of eggs
The browning of an apple after it is bitten
Burning (like oil or wood)

4. Remember: A chemical change always means that 1 or more new substances
are formed!

5. Chemical Changes

6. Physical Properties
Physical properties are properties that DO NOT change the chemical nature of matter.
Examples are:
Color
Smell
Freezing/melting point
Boiling/vaporization point
Attraction to magnets
Density
Hardness of a mineral

7. Chemical Properties
Chemical properties are properties that DO change the chemical nature of matter.
Examples:
heat of combustion
reactivity with water
Flammability
pH (how acidic something is)
Corrosion

8. chemical change
1. Milk turns sour. This is a .
A. Chemical Change
B. Physical Change
C. Chemical Property
D. Physical Property
2. HCl being a strong acid is a ; Wood sawed in two is .
A. Chemical Change, Physical Change
B. Physical Change, Chemical Change
C. Chemical Property, Physical Change
D. Physical Property, Chemical Change        
         
chemical property
physical change

9. 3. CuSO4 is dissolved in water:
A. Chemical Change
B. Physical Change
C. Chemical Property
D. Physical Property
        
4. Aluminum Phosphate has a density of g/cm3:
Physical Change
Physical Property

10. 5. Which of the following are examples of matter?
A. A Dog
B. Carbon Dioxide
C. Ice Cubes
D. copper (II) nitrate
E. A Moving Car
F. All of the above
6. The formation of gas bubbles is a sign of what type of change?
All of the above
Chemical Change

11. 7. True or False: Bread rising is a physical property.
8. True or False: Dicing potatoes is a physical change.
 9. Is sunlight matter?
 10. The mass of lead is a property.
False
True No
Physical