1. Chemistry: Changing Matter

2. Lesson 1 What are Physical and Chemical Changes?
Matter changes all the time:
Physical Change: matter keeps the same chemical properties
Chemical Change: matter changes into a different kind of matter with different properties

3. Physical Changes The substance does not change into something else
Changes in:
Size
Shape
Volume
State of matter

4. Physical Change Examples
Rain to sleet
Wood to sawdust
Paper to shredded paper
Wax to melted wax
Potato to grated potato
Gemstone to carved gemstone
Copper to hammered copper

5. Chemical Changes
1 kind of matter changes into a different kind of matter with different properties
Example: Cooking foods cause them to go through a chemical change
Egg vs. cooked egg

6. Chemical Changes (cont.)
Causes atoms to rearrange themselves to form new kinds of matter
Clues that chemical changes have occurred:
Heat
Light Iron = gray
Sound
Fizzing Rust = reddish orange
Color

7. Chemical Changes Examples
Burning of a candle in an oxygen atmosphere
Changes to ash
Carbon dioxide
Water vapor

8. Chemical or Physical Change?