Post on 24-Dec-2015
transcript
Analyze the picture
• Look at your vocabulary and figure out which part of the picture (that you just drew) is the solution, which is the solvent and which is the solute. Label each.
• Explain (in your own words) what each term means
Osmosis!
• Watch the animation at: http://highered.mheducation.com/sites/0072495855/student_view0/chapter2/animation__how_osmosis_works.html
• Watch it again, pausing regularly. In your journal, explain what osmosis is, highlighting the following terms: diffusion, water, plasma membrane, permeable and molecules
• Take the quiz underneath the animation to check your understanding. If you don’t get them correct, re-watch the animation and try again.
Checkpoint—what do we call the outermost part of the egg, now that the shell has been
removed?
• A semi-permeable membrane
Egg in water
• Draw a few dots in the “egg” in the water• These represent solutes (sugars, salts) in the
egg
Egg in water (cont)
• Do not draw ANY dots in the water portion. Assume the water was pure. There is no solute.
Egg in water (cont)
• There’s a phrase that is AWESOME to help remember osmosis. Write it down. That phrase is:
•SUGAR SUCKS!
Egg in water (cont)
• Show in your diagram what happened (as I did below) and explain why– Did the egg LOSE or GAIN mass when it was in
water? Explain.
Egg in water (cont)
• Basically, in osmosis, the solution that has MORE sugar or salt will SUCK WATER from the other one in order to even things out. So which way will the water move if the egg is in water?
Egg in syrup
• Draw a few dots in the “egg” in the water• Draw LOTS of dots in the syrup to represent all
the sugars in it!
Egg in syrup (cont)
• Show in your diagram what happened (as I did below) and explain why– Did the egg LOSE or GAIN mass when it was in
syrup? Explain.
Egg in syrup (cont)
• Remember, in osmosis, the solution that has MORE sugar or salt will SUCK WATER from the other one in order to even things out. So which way will the water move if the egg is in sugar?
Apply it!
• Write a short explanation (using the results of the egg lab, what you’ve learned about osmosis and what you know about a diabetic’s blood) to explain why diabetics are so thirsty! I pretty much guarantee this will be an essay question on your Unit 2 test!!
Look up the definitions of each term & write them in your own words
• Remember, the definitions are in your JOURNAL already.
• The important thing for each definition is whether there is more solute INSIDE the cell or OUTSIDE the cell (or whether they’re equal)
• It’s also important to know whether water would be sucked INTO the cell or sucked OUT OF the cell.
Take the 3 pictures provided to you
• Decide which represents hypotonic, isotonic and hypertonic and glue them under the correct flap. Below each, show and explain which way water would move.