Why does salt become invisible once it is mixed with water?
Hypotheses: Ask children if they know where salt hides when it is mixed with water. We know it is there. Why can't we see it?
- A clear drinking glass
- ½ cup of salt
- Hot tap water
- A spoon
Manipulations: This experiment must be performed by the early childhood educator or in small groups since it requires a large quantity of salt.
- Fill the drinking glass with hot tap water (salt dissolves better in hot water). Fill it right to the rim.
- SLOWLY pour the entire ½ cup of salt in the drinking glass while stirring with the spoon.
Explanations: By pouring the salt slowly, you were able to add the entire quantity of salt without the water overflowing. How is that possible? There are spaces between water molecules called interstices. The salt does not require additional space because it fills up these spaces. We say that it dissolves in water.
a Bachelor's Degree in Biological Science. She has worked in a
laboratory and tested her knowledge. She has taught Math, Chemistry, and
Physics. She has also developed a simplistic and innovative approach
designed to introduce young children to scientific experiments, old and
new. She created her friend Globule. This character is sometimes red,
and sometimes white. He guides little ones through their scientific
experiments and discoveries. It is clear to see Angélique is passionate
about children and science. Globule's Approach.