Do Now What is osmosis? What happened when we put our gummi bears into water? WHY did this happen?

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Presentation transcript:

Do Now What is osmosis? What happened when we put our gummi bears into water? WHY did this happen?

Objectives To understand what happens during osmosis in regards to osmotic pressure. To compare and contrast hypertonic, hypotonic, and isotonic solutions. To explain different real life applications of these solutions.

Osmotic Pressure What is osmosis? Whichever has MORE water (either the solution or the cell) is going to be the one to have a higher osmotic pressure.

“Tonicity” The measure of osmotic pressure There are 3 types of solutions in regards to tonicity Isotonic Hypertonic Hypotonic

Quick Refresher! What is a solution? Solute vs. solvent? Example?-

Isotonic Solutions Same amount of solute outside the membrane as there is inside. (osmotic pressure is equal) Effect: NOTHING  Plant Cell Blood Cell 11,397x

Hypertonic Solutions Solution contains MORE SOLUTE than the cell, water flows out of the cell. (Osmotic pressure is higher inside) Effect: cell shrinks/shrivels  “Plasmolysis” “Crenates”

Hypotonic Solutions Solution contains LESS SOLUTE than the cell, water flows into the cell. (osmotic pressure is higher outside the cell) Effect: cell swells or bursts! /

High or low Solute? Cell in ________ Solution

Real Life Application Turn to the person sitting next to you. In the next few slides you will see real life scenarios using the 3 types of solutions we have discussed. For each scenario you and your partner should determine what type of solution is being described as well as what will happen.

A salt water fish is put into a freshwater aquarium. Scenario 1 A salt water fish is put into a freshwater aquarium. What type of solution is the freshwater? What is going to happen to the cells of the fish?

Scenario 2 A patient is given an IV, which contains the perfect balance of glucose What type of solution is in the IV? What is going to happen to the cells of the human?

Scenario 3 Your garden is infested with slugs so you go around pouring salt on them What type of solution is this salt? What is going to happen to the cells of the slug? (don’t do this to the poor slugs )

Practice By yourself or with a partner (anyone), work on the osmosis problems. First try to do this by yourself, then verify your answers with a partner. Try to help each other. If you are confused, raise your hand and I will come help you!!

3-2-1 Exit Slip On a SEPARATE sheet of paper… List 3 things you learned today List 2 things you are confused about List 1 thing you found interesting