Osmosis

Grade Level: 7

Unit: Micro-Life

Assignment type: In Class Lab with 1 Page Homework Assignment

Lesson objectives:
 * Student will understand what diffusion is.
 * Student will be able to explain how osmosis happens and relate it to everyday life.
 * Student will understand the difference between a hypotonic, hypertonic and isotonic solution and how this affects a cell.

Time required to complete this lesson: 2 days

 Title of lesson: Osmosis

Resources/materials needed:
 * Test Tubes
 * Starch
 * Iodine
 * Cellophane
 * Video Recorder

Description of lesson: <span style="font-family: Arial,Helvetica,sans-serif;">Day 1- At the beginning of class, I will go over Osmosis and the three different types of solutions (hypotonic, hypertonic and isotonic). We will then do a lab to help the students visualize these concepts. Before the lab begins, students will be asked to form a hypothesis on whether the water will move into or out of the "cell". The student will use a test tube containing a starch solution (starch and distilled water) covered with cellophane to simulate a cell. The test tube/ "cell" will be inverted into a beaker of water that contains iodine. When starch comes into contact with iodine, it turns a bluish-black color. This color change will allow the students to observe the movement of the water, which contains iodine, into the "cell". This will allow students to visualize how the cell membrane and the solutes contained within the membrane controls what moves in and out of the cell. The students will then be asked to document whether the water moved into or out of the cell.

<span style="font-family: Arial,Helvetica,sans-serif;"> 2nd day- Students will get into groups of 5 and will be asked to make a short movie about osmosis (3-5) minutes. This movie can be as simple as explaining how perfume diffuses through air, or the students can use human examples. Just be creative!

<span style="font-family: Arial,Helvetica,sans-serif;">Assignment: <span style="font-family: Arial,Helvetica,sans-serif;">1st day Homework - 1 page double space lab report that includes hypothesis, data and conclusion on the Osmosis Lab.

<span style="font-family: Arial,Helvetica,sans-serif;">Technology used: <span style="font-family: Arial,Helvetica,sans-serif;">Video recorder <span style="font-family: Arial,Helvetica,sans-serif;"> <span style="font-family: Arial,Helvetica,sans-serif;">The technology used in this lesson changes the teaching / learning in this way: <span style="font-family: Arial,Helvetica,sans-serif;">Buy making a movie about Osmosis, student will gain an understanding of how osmosis affects them in their everyday lives.