1. 3.2 - Changes in Matter

2. There are two types of changes matter can undergo
PHYSICAL CHANGE
CHEMICAL CHANGE
What is it?
no new substance formed
is a change in the phase of a substance
What is it?
new substance with new properties are formed

4. There are two types of changes matter can undergo
PHYSICAL CHANGE
CHEMICAL CHANGE
What is it?
no new substance formed
is a change in the phase of a substance
How it occurs:
Intermolecular bonds are broken
the distance between molecules changes
What is it?
new substance with new properties are formed
How it occurs:
Intramolecular bonds (chemical bonds) are broken
bonds are broken and formed

9. There are two types of changes matter can undergo
PHYSICAL CHANGE
CHEMICAL CHANGE
How do you know if a change is chemical:
new colour
new smell
heat/light might be given off
bubbles or gas formed
solid material forms in liquid (precipitate)
difficult to reverse (undo)
How do you know if a change is physical:
no new colour
no new smell
change in shape
reversible

10. CHEMICAL CHANGE

11. Liquid
Solid
Liquid
CHEMICAL CHANGE

12. PHYSICAL CHANGE

13. There are two types of changes matter can undergo
PHYSICAL CHANGE
CHEMICAL CHANGE
Examples:
mixing
dissolving
phase change
Examples
burning
explosions
stove top cooking

14. gas solid liquid Types of phase changes condensation sublimation
deposition
evaporation/
vaporization
melting
solid
liquid
freezing/solidification

15. Types of energy changes
Exothermic: releases heat (KABOOM!!)
Endothermic: absorbs heat
HEAT

16. Practice
P. 61 #59