Are Plastic Bags Selectively Permeable?

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Are Plastic Bags Selectively Permeable? Powered By Docstoc
					Joe R. Adair Outdoor Education Center                                   Leann Iacuone, Director
110 Scout Creek Ct                                               liacuone@laurens55.k12.sc.us
Laurens, SC 29360                                                               (864) 984-5492

                                        Chemical Reactions

Grade Level: 7th

Standard: 7-5.1
Recognize that matter is composed of extremely small particles called atoms.

Standard: 7-5.6
Distinguish between acids and bases and use indicators (including litmus paper, pH paper and
phenolphthalein) to determine their relative pH.

Standard: 7-5.7
Identify the reactants and products in chemical equations.

Standard: 7-5.8
Explain how a balanced chemical equation supports the law of conservation of matter.

Objectives:
   Students will identify types of matter.
   Students will observe physical and chemical changes.
   Students will catergorize reactions as physical or chemical reactions.
   Students will test for pH, dissolved oxygen and turbidity in water.

Pre-visit Activities:
    Introduce students to the periodic table and elements.
    Students should understand the difference between pure substances and mixtures.
    Students should review lab safety procedures

Post-visit Activities:
   Review lab activities completed at Adair Center.
   Continue to review chemical reactions

Time: 140 minutes




                                                                                   Page 1 of 10
Joe R. Adair Outdoor Education Center                                    Leann Iacuone, Director
110 Scout Creek Ct                                                liacuone@laurens55.k12.sc.us
Laurens, SC 29360                                                                (864) 984-5492

Materials:
   Corn Starch Mixture                                  Test Tube
   Gummi Bear                                           Test Tube Clamp
   Iodine Mixture                                       Worksheets
   Plastic Bags                                         Smore’s Materials
   Potassium Chlorate                                   Spotplates
   Propane Tank                                         Goggles
   Ring Stand                                           Five Solutions Lab Materials
   Striker

Procedure:
   1. Matter – 10 minutes
        a. Review Matter
                 i. Pure Substances and Mixtures
                ii. Elements / Compounds and Heterogenous / Homogenous
        b. Fill in Tree Map

   2. Chemical Reactions – 30 minutes
        a. Plastic Bag Lab Set Up
                i. Students will set up the plastic bag lab experiment.
               ii. Connect chemical reaction with transport.
        b. Gummi Bear
                i. Video
               ii. Demo
              iii. Discussion
              iv. Check Plastic Bag Lab

   3. Five Solutions Lab – 30 minutes
         a. Complete Lab

   4. Water Quality Testing – 30 minutes
        a. Test water quality in three areas.
                i. Frog Pond
               ii. Low Creek
              iii. Edge of Property

   5. Evidence of Chemical Changes – 10 minutes
         a. Review evidence of chemical changes

   6. Smore’s Lab for Chemical Reactions – 30 minutes


                                                                                    Page 2 of 10
Joe R. Adair Outdoor Education Center          Leann Iacuone, Director
110 Scout Creek Ct                      liacuone@laurens55.k12.sc.us
Laurens, SC 29360                                      (864) 984-5492




                                                          Page 3 of 10
Joe R. Adair Outdoor Education Center                                   Leann Iacuone, Director
110 Scout Creek Ct                                               liacuone@laurens55.k12.sc.us
Laurens, SC 29360                                                               (864) 984-5492


                       Are Plastic Bags Selectively Permeable?
Problem: What evidence is there of a chemical change?

Hypothesis:__________________________________________________________________
          _____________________________________________________________________
Experiment:
Materials: 250 mL Beaker                       Small Plastic Bags
            Tape                               Graduated Cylinder
            Starch Solution                    Iodine Solution
Methods:
  1. Collect all of your materials.
  2. Decide if you want the iodine solution to go in the plastic bag OR in the beaker.
  3. DO NOT ALLOW THE STARCH AND IODINE SOLUTIONS TO MIX THEY WILL GIVE A
      BLACK COLOR IF THEY DO.

      Beaker
      a. Measure out 100 mL of the solution chosen to go in the beaker and leave it alone.

      Bag
       a. Put 100 mL of the other solution in the plastic bag.
       b. Fold the edges of the bag over the beaker and tape them down. Write your group
          name on the tape.

   4. Place the beaker out of the way, in a safe place overnight.
   5. Look at the beaker and plastic bag the next day to see what happened.

Independent Variable: _______________________________________________________
Dependent Variable: ________________________________________________________
Controls: _________________________________________________________________
Safety:
   1. _______________________________________________________________________
   2. _______________________________________________________________________

Observations: Please draw what you see
   Beginning Set-Up                                        Ending Observations




                                                                                   Page 4 of 10
Joe R. Adair Outdoor Education Center                                   Leann Iacuone, Director
110 Scout Creek Ct                                               liacuone@laurens55.k12.sc.us
Laurens, SC 29360                                                               (864) 984-5492

Discussion: Things to think about as you write your discussion. Do not just answer the
questions
    Did the iodine molecules move through the membrane? How do you know?
    Did the starch molecules pass through the membrane? How do you know?
    What can you infer about the movement of large and small molecules across a
       membrane from this experiment?
    What type of membrane is the plastic bag? How do you know?

____________________________________________________________________________

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____________________________________________________________________________


Conclusions:

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________
                                                                                   Page 5 of 10
Joe R. Adair Outdoor Education Center          Leann Iacuone, Director
110 Scout Creek Ct                      liacuone@laurens55.k12.sc.us
Laurens, SC 29360                                      (864) 984-5492




                                                          Page 6 of 10
Joe R. Adair Outdoor Education Center          Leann Iacuone, Director
110 Scout Creek Ct                      liacuone@laurens55.k12.sc.us
Laurens, SC 29360                                      (864) 984-5492




                                                          Page 7 of 10
Joe R. Adair Outdoor Education Center                                 Leann Iacuone, Director
110 Scout Creek Ct                                             liacuone@laurens55.k12.sc.us
Laurens, SC 29360                                                             (864) 984-5492

                                Evidence of Chemical Changes


        Evidence                                Description / Example




                                                                                 Page 8 of 10
Joe R. Adair Outdoor Education Center                                    Leann Iacuone, Director
110 Scout Creek Ct                                                liacuone@laurens55.k12.sc.us
Laurens, SC 29360                                                                (864) 984-5492

                                        S’mores Lab

Problem: What are the chemical and physical changes that occur with making s’mores?

Hypothesis: _________________________________________________________________

____________________________________________________________________________


Experiment
Materials:
   Chocolate                                            Marshmallow
   Fire Source                                          Sticks
   Graham Crackers

Methods:
1. Place graham cracker on plate / napkin and lay desired amount of chocolate down.
       a. If you want to warm the chocolate, heat between your hands – do not catch on fire.
2. Place marshmallow on stick and cook over Bunsen burner to desired crispness.
3. Place on chocolate and put second graham cracker on top to push marshmallow off the
   stick.
4. Observe and enjoy.
5. Clean your area with a towel and cleaner.
6. Put sticks at table where turtles are located.
7. Clean up wrappers

Independent Variable: _________________________________________________________

Dependent Variable: __________________________________________________________

Controls: ___________________________________________________________________

Safety:

   1. _______________________________________________________________________

   2. _______________________________________________________________________

   3. _______________________________________________________________________




                                                                                    Page 9 of 10
  Joe R. Adair Outdoor Education Center                       Leann Iacuone, Director
  110 Scout Creek Ct                                   liacuone@laurens55.k12.sc.us
  Laurens, SC 29360                                                   (864) 984-5492

  Observations:

     Item                      Before Heat                   After Heat


Graham Cracker




  Chocolate




 Marshmallow



    Other
 Observations


  Discussion:

  ____________________________________________________________________________

  ____________________________________________________________________________

  ____________________________________________________________________________

  ____________________________________________________________________________

  ____________________________________________________________________________

  ____________________________________________________________________________

  ____________________________________________________________________________

  ____________________________________________________________________________

  Conclusion:

  ____________________________________________________________________________

  ____________________________________________________________________________

  ____________________________________________________________________________
                                                                        Page 10 of 10

				
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