The Shell-Less Egg Content Area BACKGROUND: In the second experiment Science, The egg is an amazing students view the properties of component. It has the ability to osmosis (water transfer) across Grade/Age sustain and grow a chick embryo the semipermeable egg 3rd - Middle School until hatch time, makes a healthy, membrane. Students’ experiment protein filled breakfast on the run, with their shell-less eggs in Tags or it even has porous properties different solvent combinations. Students determine either by Acid-Base Reactions, that make it ideal for color mass or measurement, that water Osmosis, Chemical changing fun during holidays! moves from high water to low Reactions water concentration, eventually This 2 part lesson will Introduce reaching equilibrium. Learner Outcomes students to Acid Base Reactions and the concept of Osmosis. Describe acid-base The third experiment, a bonus reactions In the first activity, youth observe experiment, uses gummy bears. Identify parts of the egg the effects of acid on eggshells. Like the shell-less egg, they and basic functions At the end of the first experiment, demonstrate the properties of Cite common household students describe what reactions osmosis. This can be used in acids took place. Each youth uses three addition to, or completely Describe osmosis shell-less eggs for part 2. (We separate from the 2 part Determine the direction of recommend having 3 shell-less experiment, depending on your water movement from eggs for part 2) time restraints. higher to lower potential Explain how a semipermeable membrane works Colorado Academic Standards: Science Third Grade 2. Life Science 1. Organisms have unique and diverse life cycles. Fourth Grade 2. Life Science 1 Organisms have both internal and external structures that serve various functions. Fifth Grade Physical Science 2. Chemical reactions Colorado State University Extension 4-H Programs are available to all without discrimination.Page OPENING QUESTIONS: molecules FUN FACTS! 1. What are the basic parts of 6. What are some uses for You can tell if a chicken an egg? (Chicken Egg): Vinegar? Open discussion is going to lay a colored Shell, Membrane, Egg 7. What does vinegar cause? egg or a white egg by White, Yolk, and Air Pocket. Chemical Reactions the color of her ear 8. Does water move freely? lobes. This as a comparison: which Eggnog is a well-known has a higher concentration beverage made from of water, and which has a eggs and milk. When lower concentration of water making eggnog, eggs on each side of the semi- should be heated to permeable membrane. 160°F (71°C) or you Water will freely move from can use pasteurized high to low. An egg’s shelled eggs or egg concentration of water is products. higher than corn syrup. An In 2019, it was egg’s concentration of water estimated the average Photo credit: ScienceWorld.ca is lower than tap water. An American ate 289.5 egg has a slightly lower eggs per year. 2. What does a shell do for the concentration of water than Egg White has long egg? Protection, Holds vinegar. been used as a facial. things in place, etc. 9. What is a pH? What is an An egg is a single cell. 3. What is a membrane? What acid? What is a base? A The extinct Elephant does it do for the egg? A pH is an acronym for percent Bird from Madagascar membrane is a thin line of Hydrogen (atoms). If there had the largest known cells that surround the fragile are a lot of hydrogen atoms bird egg. The eggs inner components of the in a solution, the solution is weighed 22 pounds. egg. It is semipermeable, acidic. If there is a small They had a 36 inch meaning it will allow certain amount of hydrogen in the diameter, and were 12 solvents to transfer across it. solution, it is basic. The inches tall. It had a 2 4. Why would movement of higher the hydrogen content, gallon volume! ‘something’ through a the lower the pH value, so 0 The Ancient Chinese membrane be important? (the most hydrogen)—6.9 Stored Eggs up to 5. What happens in a chemical (less hydrogen) is acidic. A several years by reaction? A process that pH value of 7 is neutral. immersion in a variety involves the rearranging of Between 7.1 and 14 is basic. of such imaginative mixtures as salt and wet clay; cooked rice, salt and lime; or salt and wood ashes mixed with a tea infusion. They did not taste good by todays standards. There is no significate difference between white and brown eggs; it is the chicken breed that makes the SPUR SPUR difference. The Labeled Chicken from Colorado State University Extension, Pueblo County captured 4/9/2020 https:// pueblo.extension.colostate.edu/programs/4-h/4-h-project-areas/livestock/livestock-tests-and-study-guides/ Page 2 DO: SHELL-LESS EGG circumference of the first that occur when ACID / BASE REACTION egg. Use a ruler to find the substances are Time Needed: length of the string. mixed can be Prep: 30 mins 3. Place that egg in a jar and identified by the Rx Time: 7 days label it with the string’s emergence of measurement. substances with Today we are going to talk 4. Repeat step 2 for each different properties; about the egg! Eggs come in additional egg. the total mass many shapes and sizes, but 5. Cover the eggs with vinegar remains the same. most all contain the same basic and store in a safe place. Middle School parts. You should see bubbles Physical Science Shell: Outer hard surface of the forming on the shell. When two objects egg made primarily of calcium interact, each one carbonate crystals. exerts a force on the Membrane: Layer of cells under other that can cause the shell that surround the inner energy to be fragile parts of the egg. Allows transferred to and transfer of solvents and air across from the object. the membrane (semipermeable). POWER WORDS Air Pocket: A sac of air within the egg used by chick upon final acid: a chemical compound that tastes development. Photo credit: Stephanie Lamm sour and forms a water Egg White: The clear, viscous solution which turns blue substance around the yolk of an 6. The next day, use the big litmus paper red egg that turns white when cooked base: a chemical that or beaten. spoon to scoop out each egg from the vinegar. has a pH above 7. Egg Yolk: Yellow portion of egg Usually substances like filled with protein and fat. 7. Pour out the old vinegar and place the egg back in the ammonia, bleach, or In todays experiment, we are baking soda. going to look at acid/base jar. 8. Cover the egg/s with fresh chemical reaction: a chemical reactions. process that involves Specifically vinegar (an acid) vinegar and store in a safe place. rearrangement of the and how it affects an egg’s molecular or ionic shell. 9. Every morning, check on the state of the egg/s structure of a substance, as opposed to a change Materials: without taking out of the jar, for about 3–7 days. *You in physical form. Large mouth pint or quart only need to replace the circumference: the mason jar (1 per egg) enclosing boundary of a vinegar after the first day. White vinegar (enough to 10. After a week, the egg/s curved geometric figure cover eggs plus a generous Rx: reaction amount in addition) should be translucent but still pretty much egg- abbreviation Raw egg/s in shell/s shaped. water potential: a Mixing spoon 11. Carefully measure the measure of how freely Tape and pen to label circumference of the middle water molecules can Flexible measuring tape OR portion of the egg/s and move in a particular string and ruler environment or system record. Procedure (Do for each egg): Teacher Tip! 1. Designate a “vinegar Do not break the eggs; Make several extra “shell- pouring station” to avoid you need them for less eggs” to use as a vinegar waste. the experiment! control in the next activity. 2. Use a string to measure the Page 3 REFLECT: gently shake the egg, you can What occurs between the see the yolk sloshing around in CHICKEN and EGG vinegar and the egg? the white. If the membrane JOKES When you first covered your tears, the egg contents will spill just as a normal cracked egg, Q: The egg police entered egg with vinegar, what were the crime scene. They the bubbles on the shell’s however the egg will taste ‘pickled’ if cooked* (*perfectly stood horrified at the surface? What evidence is atrocity committed there of chemical change? acceptable if kids want to taste a Fully Cooked, pickled egg). against the egg victim. What reaction is involved to What was the crime? make the shell dissolve? A: Poaching! What helps keep the egg’s insides from pouring out? Q: What does a meditation Is there a difference egg say? between the size of the egg A: OHM-let! at the beginning and at the end of the experiment? What Note to Teachers: Younger Q: Who tells the funniest do you think caused this students may think that the egg jokes? change? outer shell has "transformed" A: A Comedi—hen! into the membrane. Remind Explanation: them that the outer shell and the Q: How can you drop an Describe an acid base reaction inner membrane are two egg 6 feet without and what effects took place to completely different layers. breaking it? egg shell.