1. Physical and Chemical Changes
Today:
Define physical and chemical changes
Bag of change lab
Writing conclusions based on results.

2. Chemical/Physical Change:
We will distinguish between a physical and chemical change.

3. Matter Matter is anything that takes up space and has mass.
Matter is made of atoms/molecules
Matter is constantly experiencing both chemical and physical changes.

4. Physical Change
Physical changes occur when matter changes its appearance but not its chemical nature.
Physical property changes could include a change in state (ice melting), or size (cuting paper)
But NO new substances are formed

5. Physical Change

6. Chemical Change
Chemical changes are changes matter undergoes when it becomes new or different matter.
To identify a chemical change look for signs such as color change, bubbling and fizzing, light production, smoke, and presence of heat.

7. Chemical Change A chemical change occurs when fireworks are used.
Fireworks are made of metals such as magnesium and copper. These change chemically as they light up the sky.

8. Is it a chemical or physical change?
Sugar dissolving in tea
Chemical Change
Physical Change

9. Is it a chemical or physical change?
Logs burning
Chemical Change
Physical Change

10. Is it a chemical or physical change?
Breaking water up by separating it into hydrogen and oxygen
Chemical Change
Physical Change

11. Is it a chemical or physical change?
Cutting paper
Chemical Change
Physical Change

12. Is it a chemical or physical change?
Metal rusting
Chemical Change
Physical Change

13. Bag of Change Lab
In this activity you will mix three unknown substances together in a plastic bag and observe the changes that occur.
Watch for changes of state (solid, liquid, gas), colour, volume, temperature, and anything else you can detect.

14. Hypothesis:
IF... we combine two unknown white solids with a dark blue solution,
THEN… I think we will observe the following changes:  
__________________________________________________________________

15. Procedure
See text p. 17 #1-6

16. Observations
Table 1: Original Reactants Name Description Notes Chemical A white , soft, powder, solid -any additional info Chemical B Chemical C

17. Table 2: Description of the Properties of Products
Property Description Colour Example: turned neon green…

18. Conclusion Conclusions must be based on your RESULTS
A black colour, thick smoke and a strong odor were observed when bread was toasted for 30 minutes. As the colour remained when cooled, a new substance was created and a chemical reaction observed.