How to tell the difference

1
Physical and Chemical Changes

• How to tell the difference

2
Physical Change

• Substance may seem different, but the way the
  atoms link up is the same.
• It is still the same stuff

3
Its a physical change if

• It changes shape or size
• It dissolves.

4
Its also just a physical change if...

• It changes phase
• (freezes, boils, evaporates, condenses)

5
Chemical Change

• Changes the way the molecules link up
• Makes new substances

6
Its a chemical change if.

• It burns
• Temperature changes without heating/cooling

7
Its a chemical change if...

• It bubbles (makes a gas)

8
Its a chemical change if...

• It changes color

9
Its a chemical change if...

• It forms a precipitate(insoluble solid)

10
What kind of change is it if someone...

• Tears up paper?
• Physical change
• Mixes salt and water?
• Physical change it just dissolves

11
What kind of change is it if someone...

• Burns paper?
• Chemical change temperature change occurs
• Evaporates salt water?
• Physical change just a phase change the water
  is still water and salt is still salt

12
What kind of change is it if someone...

• Mixes vinegar and baking soda?
• Chemical change (it bubbles as it produces a new
  substance - CO2 gas)