1. Today’s Agenda… Flashback Discuss Physical Changes at Home
Notes on Chemical Properties and Changes
Venn diagram to compare physical and chemical changes
Letter to a friend

2. Chemical Properties
and Changes
Study Pack #7

3. Today’s Goals…
I can describe a substance using its chemical properties
I can describe a chemical change
I can compare physical and chemical changes

4. Chemical Properties
Can only be observed while the object is changing into a NEW substance

5. Examples: Flammability (ability to burn) Ability to rust
Ability to tarnish

6. Chemical Changes
Result in a NEW substance
Not easily reversed

7. Examples: Wood burning Iron rusting Silver tarnishing Cooking/Baking
Foods spoiling
Leaves changing colors in the fall

8. Signs of Change How do you know a change has occurred? Gas bubbles
Production of heat, light, smoke
Change in color
Sound

9. Assignment
Write a letter to a friend describing the difference between a physical and chemical change!
Don’t forget to give an example of each.