(Chemistry for ages 5+)
Are you looking for some simple kitchen entertainment? The video above shows us how to do a cool chemistry experiment using ice, salt, and yarn. Here’s how you do it:
Adult supervision (Adult supervision at all times please)
- Carefully place 3-4 ice cubes in your glass.
- Fill your cups about 2/3 of the way full with water. You should use at least 2 cups, but you can use more if you’d like.
- Next, cut a piece of yarn for each cup. These pieces should be no more than 10 inches long.
- Lay a piece of yarn across the top of each cup. Make sure the yarn is resting on the ice cubes.
- Sprinkle a bit of salt across the top of the ice in half of your cups, not all of them.
- Lay the yarn across the top of the ice again and set the timer for 3 minutes.
- When the timer goes off, try lifting the ice by lifting the yarn. What happens this time? Do you notice a difference between the ice with the salt and the ice without the salt?
Adding salt to the ice lowers its freezing point, meaning it has to be colder for it to freeze. When you add the salt to the ice in the cup, it causes the ice to melt a little bit. Then, because the ice is so cold still, it refreezes some of the water around the yarn. This make is possible for you to lift it up with ease.