Do Now for 12/3/13 Open books to page B-34 and write up lab HW: Practical Exam on Friday Review how...

Do Now for 12/3/13Do Now for 12/3/13

Open books to page B-34 and Open books to page B-34 and write up lab write up lab

HW: Practical Exam on FridayHW: Practical Exam on Friday

Review how to carry out testsReview how to carry out tests

B18 Properties of PlasticB18 Properties of Plastic

• Introduce B18Introduce B18• Lab safetyLab safety• Draw data tableDraw data table• Heat and acetone testsHeat and acetone tests• Density testsDensity tests


B18 data table


• Lab SafetyLab Safety– Goggles and apronsGoggles and aprons– Alcohol will feel cool on your skin and Alcohol will feel cool on your skin and

burn your eyes. Wash it off.burn your eyes. Wash it off.– Dry your plastic samples between Dry your plastic samples between

each container.each container.

Do Now for 12/3/13Do Now for 12/3/13

Take out B 18 write upHW: Analysis 1, 2,4

Study for lab practical exam


• PlasticPlastic - Capable of being - Capable of being molded. A material that molded. A material that contains contains organic polymer organic polymer molecules that at some stage in its molecules that at some stage in its manufacture can be shaped by flow manufacture can be shaped by flow before becoming solid.before becoming solid.


• Relative density Relative density - The density - The density of a substance (mass per of a substance (mass per unit unit volume) in relation to another volume) in relation to another substance. It is a qualitative substance. It is a qualitative comparison rather than a comparison rather than a quantitative measure of density. quantitative measure of density. See also See also density.density.


• Analysis questions 1,2,4Analysis questions 1,2,4

• 1. Using evidence from your table, 1. Using evidence from your table, identify which of the plastics identify which of the plastics scratched. How will this property scratched. How will this property affect their use?affect their use?– All of the plastics scratched.All of the plastics scratched.


• 2. Below is a scale showing the relative 2. Below is a scale showing the relative density of the 4 liquids you used to density of the 4 liquids you used to determine the density of the plastics.determine the density of the plastics.– A. Which was the most dense? Why?A. Which was the most dense? Why?– B. Which was the least dense? Why?B. Which was the least dense? Why?– C. Make a copy of the scale in the C. Make a copy of the scale in the

book. Show where each plastic fits on book. Show where each plastic fits on the scale.the scale.


• 2A. Polyvinylchloride (PVC) 2A. Polyvinylchloride (PVC) because it sunk in all 4 liquids. The because it sunk in all 4 liquids. The other plastics floated in saltwater, other plastics floated in saltwater, the densest of the liquids.the densest of the liquids.

• 2B. Polypropylene (PP) is the least 2B. Polypropylene (PP) is the least dense because it floats in the dense because it floats in the alcohol/water mixture, and all other alcohol/water mixture, and all other samples sunk.samples sunk.


• 2C.2C.• ________________________________________________________________________

0.800.80 0.900.90 1.001.00 1.101.10AlcoholAlcohol Alcohol/Alcohol/ WaterWater salt salt

waterwater waterwater PPPP HDPE PS HDPE PS

PVCPVC


• 4a. Nail polish remover (high in 4a. Nail polish remover (high in acetone) container.acetone) container.– PP or HDPE because they are not PP or HDPE because they are not

affected by acetone.affected by acetone.

• 4b. Dishwasher safe food 4b. Dishwasher safe food container.container.– PP or HDPE because they are not PP or HDPE because they are not

affected by heat.affected by heat.

• 4c. Sports drink container.4c. Sports drink container.– HDPE because it does not crease and HDPE because it does not crease and

is not affected by heat.is not affected by heat.


• Lab practical test.Lab practical test.– You will receive an unidentified You will receive an unidentified

sample of plastic (it will be a different sample of plastic (it will be a different color than the samples we studied)color than the samples we studied)

– You will carry out all the tests we did You will carry out all the tests we did over the last two days and use that over the last two days and use that data to correctly identify your sample data to correctly identify your sample of plastic.of plastic.

– You can place anything you want on You can place anything you want on ONE SIDE of a 3x5 card to help you ONE SIDE of a 3x5 card to help you with the task.with the task.

Do Now for 12/3/13 Open books to page B-34 and write up lab HW: Practical Exam on Friday Review how...

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