2. density compared to other substance (sink or float in water?)
NOV 5 / Act B18
Properties of Plastic
LEARNING TARGET: I can use collected evidence from chemical / physical property tests to identify an unknown plastic sample.
CH Q
How do the physical and chemical properties of plastics affect their uses?
VOCAB:
physical / chemical properties; relative density
density compared to other substance
(sink or float in water?)
Look at previous notes

3. DISCUSSION
What makes plastic a useful material?
2. Remembering Act 12, if you were going to manufacture a product such as a drink container, why might you make it out of plastic?
strong, light, cheap, easy to shape/color, won't break
3. List Physical properties of plastics?
flexible, strong, heat resistant, relative density to water or other liquids (color not a PP as humans can change it)

4. Four Common Plastics
Color Key

5. PROCEDURE AND DATA
MATERIALS:
PROCEDURE: Read on pg. B and summarize
DATA: WS Properties of Different Plastics

6. DO NOT LEAVE OPEN VIALS SITTING ON TABLE (they get knocked over)
FYI - to get small plastic out of vial, turn upside down and let square lay flat on inside of cap – then CAREFULLY tip vial back until liquid is in bottom and take cap off with square stuck to it
neat trick!!

7. Plastics REACTION WITH ACETONE

8. RED – NO reaction with acetone

9. YELLOW – slightly bent, turning acetone yellow

10. BLUE – NO reaction with acetone

11. GREEN – bent, turning acetone green

12. Plastics EFFECT WITH HEAT

14. POST DISSCUSSION
Which of the four types of plastic you tested do you think is used most today and why?
PP (strong container) or HDPE (food - does not react)
The next few slides we can choose to make into table copies for the students to use for discussion and return to us.

20. - Discuss and answer Q 2-4 on pg. B- 37
ANALYSIS
- Discuss and answer Q 2-4 on pg. B- 37
ANS CHALLENGE Q
Which is the best material for making a drink container? A:
HDPE best for drink container
HOMEWORK
1. Finish Analysis Qs