1. Introduction to Chemical Reactions: physical and chemical changes
CLASS NOTES

2. Elements and Compounds
An element is a substance that contains only ____ kind of atom
Compound is a pure substance that is made of up ______ or more elements
Elements and compounds are created through bonding
What are the two different types of bonding?
Today we will learn about how the combination of these elements and compounds can create chemical reactions!

3. Chemical reactions produce changes…
TWO types of changes: physical and chemical
Physical change:
Change in state: solid, liquid or gas
May change in colour
Chemical change: forms a new substance
Heat may be produced
For example: newspaper
physical change: can make a ball of newspaper
chemical change: sun’s energy can turn the paper yellow is you leave it in the sun

4. Physical or Chemical Change?
Butter melting
Digestion of foods in your body
Bubbles of gas escaping from a soda
Rust on a car
Lake freezing (turning to ice from water)