- Chemical reaction: The child observed a chemical reaction between the vinegar and eggshell, which resulted in the eggshell dissolving.
- Acids and bases: The child learned that vinegar is an acid and can dissolve the calcium carbonate in the eggshell, which is a base.
- Permeability: The child learned that the eggshell is permeable, allowing the vinegar to penetrate and dissolve it.
- Elasticity: The child observed that the egg became bouncy after the shell dissolved, which is due to the egg membrane's elasticity.
For continued development, the child can explore other materials that are permeable and observe how they react with different substances. They can also experiment with different types of acids and bases to see how they react with various materials. Additionally, the child can research the science behind the eggshell and egg membrane to gain a deeper understanding of the activity.