Fantastic Lab that students love and is one of my favorites! Since I always do these two together you get two labs together.
The first is a lab to demonstrate Osmosis. You use eggs that have been soaked in vinegar to dissolve the shell, then soak them in other liquids. The results really bring home how water moves in and out of a membrane. When you pop an egg open to show them how far the food coloring got in, you will have the attention of every eye in the room.
The prep for this lab takes 7-14 days (have to give the eggs time to soak in the vinegar, then in the soaking liquids). The student part of the lab only takes a class period
*Special Note: Make sure you wash your hands after handling the eggs as they are raw. Students can be as involved as you want them to be, but make sure they follow appropriate lab procedures for handling things like raw eggs.
The second lab is to demonstrate Fermentation using a plastic bottle, yeast, sugar, water, and a balloon. Many teachers have probably seen or done this one. This one has about 1 minute of prep time, but may take up to 15 min. to see the full reaction.
My students love both of these labs. The AHA! moments you get are totally worth the preparation.
Included for both labs:
-Detailed Teacher Directions on set up and best lab procedures
-Student Lab Sheet
-Possible Answers to Conclusion Questions
Although these labs can be used for basic scientific inquiry they are most effective when teaching cell processes. Appropriate for a variety of grade levels. If doing with younger students you may want to do it as a demonstration.
Looking Into Eggs Lab: (osmosis lab)
-Eggs (minimum 13-this will work for up to two classes, for every additional class add 5 eggs-it will be enough for experiment plus three extras just in case)
- Cups-twice the number of eggs you use (8oz. or bigger, clear plastic, wide mouth to fit the eggs into)
- Food coloring (suggested blue or green)
- Craft paint (suggested blue or green)
- Balances (triple beam or electric scales-want it to measure mass not weight)
- White distilled vinegar (1/2 to full gallon)
- Large Tupperware container with top (to soak all the eggs in vinegar)
- Corn syrup (at least 16 oz.)
- Masking tape
- Student lab sheet
Balloon Lab: (fermentation lab)
**This material list is for a demo, however you can use as many as you want- if all groups will participate you need a set of these materials for each group
•One 16 oz. empty plastic bottle
•Sugar (at least 3 spoon-fulls, see directions for how to speed up reaction)
•Yeast packet (at least 1, see directions for how to speed up reaction)
•Balloon (regular size of any color)