You've probably experienced this too: You've eaten something with your fingers and they're all sticky afterwards. Or you've helped to bake a cake, and the mixing bowl is very difficult to clean because the batter sticks to it. Why does this happen? And could you make glue out of these things? Try it out.
Sticky fingers? What causes it?
You will need
- A number of substances you can test:
- Baking powder
- Table salt
- 4 glass bowls
- 4 teaspoons for stirring
Let’s get started!
Pour about a tablespoon of each substance into a small bowl.
2. Mix with water
Now slowly and carefully add enough water to each of the four samples to make a thick paste, stirring the mixtures constantly. Are some of the substances more difficult to stir than others? Rub each of the samples between your fingers. How does it feel? Which substances make your fingers sticky, and which do not? Two of the substances mentioned here can be used to make adhesives. Which are they?