Introduction to HOP2

• Purpose and Objective

-have Middle School students to learn

about plastics

National Science Educational Standards (5 – 8)

• Content Standard A:

- Science as Inquiry

- Abilities to do scientific inquiry

- Understandings about scientific

inquiry

National Science Educational Standards (5 – 8)

• Content Standard B:

- Physical Science

-Properties and changes of

properties in matter

National Science Educational Standards (5 – 8)

• Content Standard E:

- Science and Technology

- Understands about Science and

Technology

National Science Educational Standards (5 – 8)

• Content Standard F:

- Science in Personal and Social

Perspectives

- Risks and Benefits

- Science and Technology in Society

National Science Educational Standards (5 – 8)

• Content Standard G:

- History and Nature of Science

- Science as a Human Endeavor

- Nature of Science

- History of Science

National Science Educational Standards (5 – 8)

• Assessment Standard A: - Are consistent with decisions they are designed to inform - Are deliberately designed - Have explicitly state purpose - Procedures are internally consistent

National Science Educational Standards (5 – 8)

• Assessment Standard B:

- Achievement and opportunity to

learn science must be assessed

National Science Educational Standards (5 – 8)

• Assessment Standard C:

- Assessments tasks are authentic

National Science Educational Standards (5 – 8)

• Assessment Standard D:

- Assessment practices must be fair

Learning Cycle

• Engage

• Explore

• Explain

• Elaborate

Evaluate and Discuss

EvaluateandDiscuss

Elaborate ExplainStudents apply

concepts to new situations.

Students share information; concepts & terms are introduced.

Engage ExploreStudents interact with materials & each other

Students’ alternative theories and pre-

knowledge are identified

Printed with permission from Carol Collins: K-12 Science Consultant for the Hamilton County Education Service Center (HCESC), Cincinnati, Ohio.

Adapted from BSCS and Trowbridge & Bybee, 1990.

HOP2 Activities

Designed to take

5 to 12 class days

Engage One: HOP Stop Deli (optional)

Glass Plastic Aluminum

Engage Two: Can You Classify Plastic Containers?

Groups of Plastics

Engage Two: Student’s lab manual

Group Container Description Physical Properties

Explore Three: Can You Find the Floaters and Sinkers?

• Change from the original HOP kit - no flame test

- no acetone

**Use Calcium Chloride

Water Test

Sinks Floats

Calcium Chloride Test

All Float

Diluted Calcium Chloride Test #1

Floats Sinks

Y

Diluted Calcium Chloride Test #2

70% Isopropyl

Alcohol Test

Floats

M

Alcohol + Water Test

Sinks

SinksFloats

XZ

Floats Sinks

PW

Water 1.00 g/mL

Sinks>1.00g/mL Floats<1.00g/ml

Calcium Chloride Test (about 1.40 g/mL)

All Float

Diluted Calcium Chloride Test #1 (about 1.36 g/mL)

Floats

PETE

Diluted Calcium Chloride Test #2 (about 1.12 g/mL)

70% Isopropyl Alcohol Test

(about 0.92 g/mL)

Floats

PP

Alcohol + Water Test (about 0.94

g/mL)

Sinks

SinksFloats

HDPELDPE

Floats Sinks

PVC PS

Explain Four: Why Do They Float?

Density TableSubstance Density (g/mL)Water 1.00(1) PETE 1.38-1.39(2) HDPE 0.95-0.96(3) PVC 1.16-1.35(4) LDPE 0.92-0.94(5) PP 0.90-0.91(6) PS 1.05-1.07

Explain Five: How Do You Calculate the Density of a Bowling

Ball? (optional)

Evaluate Six: How Can You Identify the Kind of Plastic in

Your Groups’ Containers from Activity Two?

Elaborate Seven: How Can You Identify the Kind of Plastic in Your Groups’ containers from Activity

Two?

• Students have to refer back to their lab manuals.

• Students depend upon the lab procedure they would use in Activity Six.

• Students would be evaluated according to the rubric.

Water Test

Sinks Floats

Calcium Chloride Test

All Float

Diluted Calcium Chloride Test #1

Floats Sinks

Y

Diluted Calcium Chloride Test #2

70% Isopropyl Alcohol

Test

Floats

M

Alcohol + Water

Test

Sinks

SinksFloats

XZ

Floats Sinks

PW

Notes on Resins: (Use the back of this page if you need more room.)M. ____________________________________________________________________Z. ____________________________________________________________________X _____________________________________________________________________Y. ____________________________________________________________________W ____________________________________________________________________P. ____________________________________________________________________

Water 1.00 g/mL

Sinks>1.00g/mL Floats<1.00g/ml

Calcium Chloride Test (about 1.40 g/mL)

All Float

Diluted Calcium Chloride Test #1 (about 1.36 g/mL)

Floats

PETE

Diluted Calcium Chloride Test #2 (about 1.12 g/mL)

70% Isopropyl Alcohol Test

(about 0.92 g/mL)

Floats

PP

Alcohol + Water Test (about 0.94

g/mL)

Sinks

SinksFloats

HDPELDPE

Floats Sinks

PVC PS

Eight through Twelve: extensions

Industrial Testing:

• These are more advanced versions of the Analysis Lab.