1Blend ¼ of a red cabbage in 4 cups of water for 1 min.
2Strain the mixture into a pot and heat until almost boiling.
Warning:Use caution and an adult’s help when heating.
3Stir 4 packets of gelatin (~28 grams) into the heated mixture.
4Transfer the mixture into a plastic container and stir in 1 teaspoon of ammonia.
Warning:Ammonia has a strong odor. Once mixed in, the odor goes away.
5Place the mixture in the fridge overnight.
6Cut out 3 gelatin cubes: 2cm, 1cm, and 0.5 cm cubed
7Add the cubes into a bowl of vinegar and observe.
How It Works
The vinegar molecules move into the gelatin cubes through a process called "diffusion." This causes the color to change due to the red cabbage juice. Diffusion is when molecules randomly vibrate from areas of high concentration to areas of low concentration. Diffusion in and out of the gelatin cubes happens more quickly in the smaller ones. This is why it is an advantage for cells to be tiny: molecules can diffuse in or out much faster.
Check out the Full Lesson on Plant & Animal Cells!
In this lesson, we learn that:
Cells are the basic unit of all living things.
Plant and animal cells have parts called organelles that help them function and stay organized.
We will cover the nucleus, cell wall, cell membrane, mitochondria, chloroplast, lysosomes and vacuoles.