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Starch Bags

Time Frame:
1 class period that runs 60 minutes.

Group Size:
Small Groups


In this activity students will predict and test the direction of the particle movement.

Main Curriculum Tie:
SEEd - Grade 7 (2017)
Strand 7.3: Structure and Function of Life 7.3.2

Develop and use a model to describe the function of a cell in living systems and the way parts of cells contribute to cell function. Emphasize the cell as a system, including the interrelating roles of the nucleus, chloroplasts, mitochondria, cell membrane, and cell wall.


  • 1 piece of dialysis tubing 6 inches long
  • 2 pieces of string
  • 1 container
  • 10 ml starch solution
  • 25 ml weak iodine solution
  • 50 ml beaker
  • one-pint zip lock bag
  • starch solution 1/2 cup
  • larger container of weak iodine solution
  • worksheet


Background For Teachers:
This can be done as a demo or a lab. A starch solution will be put into a zip lock bag. This is then put into a container of diluted iodine solution. Overnight the starch will darken. You could also do this by using dialysis tubing and the effect would take only 10 minutes.

Student Prior Knowledge:
types of particle movement

Instructional Procedures:

  1. Step-by-step instructions are given to students on the worksheet.
  2. Students should ware protective eyewear.

Assessment Plan:
Appropriate use of the equipment and time receives full credit.

Lesson Design by Jordan School District Teachers and Staff.

Utah LessonPlans

Created Date :
Oct 02 2014 08:08 AM