Here’s another way to tell whether a substance is salt or sugar!
Things Required:
1 tablespoonful of salt
2 cups
Food colouring 2 colours
1 tablespoonful of sugar water
An ice cube tray with separators
Directions:
Fill the cups halfway with water and colour each one with a few drops of a different food colouring. Dissolve the salt in one cup and the sugar in the other.
Pour the solutions into opposite ends of an ice cube tray with separators. Put the tray in the freezer for an hour or two.
This Is What Happens:
The sugar cubes freeze. The salt cubes remain liquid.
Science Behind It:
Plain water turns into ice at 32°F (0°C). Both sugar and salt lower the freezing point of the water. But sugar molecules are heavier than salt molecules. There are more salt molecules than sugar molecules in a tablespoon. So, salt lowers the freezing point twice as much as sugar.
