Osmosis in a Chicken Egg

– Movement of molecules from a high concentration to a low concentration

– Movement of water molecules from a high concentration to a low concentration

- Will allow certain molecules and ions to pass through via diffusion while restricting others

Diffusion

Osmosis

Selectively Permeable Membrane

– A homogeneous mixture composed of two or more substances. The solution that forms has the same physical state as the solvent. Examples - Salt water, Sugar water, Air

Mixture – One compound is added to another and no chemical bond is formed

– Substance that dissolves another solid, liquid, or gaseous substance.

– Substance dissolved by solvent

Solution

Solvent

Solute

Types of Solutions – contains less solute (more water) compared to

another solution. Water diffuses across a semi-permeable membrane OUT OF a hypotonic solution. (into egg)

– contains more solutes (less water) compared to another solution. Water diffusion across a semi-permeable membrane INTO a hypertonic solution (out of egg)

– two solutions have the same concentration of solutes (equate amounts of water), so there is NO NET MOVEMENT of water across a semi-permeable membrane.

Hypotonic

Isotonic

Hypertonic

Experimental Setup

Vinegar contains acetic acid, which breaks apart the solid calcium carbonate crystals

Experimental Setup

You will need to be very careful with these eggs now that the shell has been removed. You will clean up any mess you make.

Experimental Setup Treatment – You will be placing your eggs into four different

concentrations of sucrose 0% (distilled water) 20% sucrose 40% sucrose Unknown sucrose solution.

Come up with a hypothesis for the net movement of water in each solution. Include the following. Which direction water will move (into or out of the egg) What will happen to the weight of the cell What type of solution do you think each represents (hypertonic, hypotonic,

or isotonic)

Experimental Setup As a group come up with an SPECIAL

TREATMENT What would you like to see an egg placed in It must be something we can find in the

school Propose these to Mr. Lynch if it is possible

we will try this as well.

Experimental Setup Day 1

In your group obtain four shell-less chicken eggs from Mr. Lynch. Handle them gently so the shell membranes remain intact. (Remember you will clean up any mess)

Gently dry each egg and weigh them

Place one egg in each of the sucrose treatment bins.

Ask for help with your special treatment.