There are two experiments that the students will investigate using uncooked eggs. Students will be given materials in which they are to explore how to remove the eggs outer shell while keeping the rest of the egg intact. The second experiment, students will be given a different set of mixtures with the intent of shrinking the egg without a shell. They will determine the substance(s) that eliminated the shell as well as the reduction of that same egg. Students will be noting the physical changes as well as the chemical changes that take place in science journals/notebooks.
Acids and Bases
Context for Use
Resource Type: Activities:Classroom Activity
Grade Level: Intermediate (3-5)
Description and Teaching Materials
1. Review with the students the necessary procedures of the lab or classroom lab.
2. Review acids and bases.
3. Present the students with a challenge. Each group of 4 students will be provided 2 eggs. Both eggs you are provided with liquid materials to help you eliminate the outer shell of the egg. You are to ensure that the rest of the egg stays intact.
4. Give the students the list of your liquid materials. Ensure that vinegar is made readily available.
5. Present to the students containers in which they are to hold the egg into.
6. Students should be given the eggs.
7. Give the students the time frame of 30 minutes to determine, complete, and record the solutions/mixtures that they will use to complete this first experiment.
***I would have several eggs ready to show them. I would also allow the students to examine the eggs, guiding them through observations, ideas, and results.
***Hopefully students would determine that vinegar was used in eliminating the shell, but the concentration of vinegar would be unknown. That should be explored.***
8. Remind the students to enter observations, ideas, thoughts, drawings, etc. into the journals of the first activity.
9. Allow for students' questions to guide the discussion that follows with the experiments.
***Follow the same procedures as in activity one, however make sure that students understand that corn syrup was used in reducing the egg.
***After each days activities debrief with the students about what is happening. What happened? Why did that happen? What would happen if...?
I would close the lesson by asking why is it so important that we completed these experiments. I would also challenge the students to determine how, where, and why this might be used in the, "real world:.
Again, these are extension activities that are meant to reinforce the concepts of concentrations and chemical reactions.
Here is the site in which the actual experiments were found. http://www.eggs.ab.ca/kids/Egg%20Science/eggsperiment004.htm
Teaching Notes and Tips