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Name _____________________________ Period _____ Date _________ Egg Lab The Effect of Different Solutions on Chicken Egg Mass Mass of Egg (g) Solution Initial Final Volume of Solution in Beaker (mL) Initial Final Corn Syrup Tap Water 80 75 28 115 200 200 252 160 1. What is the independent variable for this experiment?_____________________ 2. What is the dependent variable for this experiment? ______________________ 3. Identify 3 constants for this experiment. ________________________________ _______________________________________________________________ 4. Water molecules can cross the selectively permeable membrane, but the solute (dissolved particles) cannot. Therefore, the change in mass and volume must have been caused by a net flow of water into or out of the egg. Draw sketches below summarizing the movement of water molecules into and out of the egg. a. The initial egg has been drawn for you. For the the initial cell for each solution add: solutes (use dots) to the solution and egg as appropriate labels of high and low concentration of solutes and water in the initial diagram draw an arrow indicating which way the water molecules moved b. Draw the final egg indicating its resulting size change. Tap Water Egg initial final Corn Syrup Egg initial final Conclusion Questions 1) What did the outer membrane of the egg allow water molecules to do as the egg was placed in different test solutions? 2) a. Which way did the water molecules move when the egg was placed in corn syrup? b. How do you know? Cite evidence. c. Why did the molecules move in this direction? d. What is this type of molecular movement called? 3) a. Which way did the water molecules move when the egg was placed in tap water? b. How do you know? Cite evidence. c. Why did the molecules move in this direction? d. What is this type of molecular movement called? 4) The movement of a substance from high to low concentration is known as _________________________. 5) When water diffuses across a selectively permeable membrane the process is called _____________________. 6) Write a paragraph below summarizing this lab. Include the following words: concentration, osmosis, selectiely permeable, and homeostasis. Underline the words. _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________