Objective
By the end of this lesson, you will be able to grow your own rock candy and understand the science behind it.
Materials and Prep
- Glass jar or container
- Cotton string or wooden stick
- Clothespin or clip
- Water
- Granulated sugar
- Food coloring (optional)
- Pencil or pen
- Paper
- Measuring cup
- Plate or tray
Prior to the lesson, make sure you have all the materials ready and gather them in one place.
Activities
- Start by discussing the concept of crystallization with the student. Explain how sugar crystals form and grow over time.
- Show the student how to create a supersaturated sugar solution by dissolving sugar in water. Demonstrate the proper ratio of sugar to water and discuss the importance of stirring to dissolve the sugar completely.
- Once the solution is ready, add a few drops of food coloring if desired and mix well.
- Attach the cotton string or wooden stick to the clothespin or clip, making sure it is long enough to hang into the jar without touching the sides or bottom.
- Dip the string or stick into the sugar solution, making sure it gets fully soaked. Remove any excess solution by gently tapping it against the jar.
- Place the string or stick in the jar, making sure it hangs freely without touching the sides or bottom.
- Set the jar in a safe place where it won't be disturbed. Leave it undisturbed for several days or until the rock candy has grown to the desired size.
- Observe and document the growth of the rock candy each day. Measure and record its size, shape, and any other changes you notice.
- Once the rock candy has reached the desired size, carefully remove it from the jar and let it dry on a plate or tray.
- Finally, enjoy your homemade rock candy by tasting and sharing it with others!
Fifth Grade Talking Points
- "Crystallization is the process in which atoms or molecules arrange themselves in a repeating pattern to form crystals."
- "Supersaturated solution is a solution that contains more dissolved solute than it can normally hold at a given temperature."
- "Sugar crystals form when the supersaturated sugar solution cools down and the sugar molecules come together to form solid crystals."
- "The shape and size of the rock candy crystals depend on factors such as temperature, sugar concentration, and the presence of impurities."
- "By observing and documenting the growth of the rock candy, we can learn more about the process of crystallization and how different factors affect crystal formation."