For the school science fair our class wanted to find out why the ocean doesn’t freeze. The materials we used were water, salt, 4 bowls, a tablespoon and spoons.
Our hypothesis was IF we added a salt concentration to water, THEN the water will not freeze.
First, we used 4 cups of water for each bowl. and added 0, 1, 2 or 3 tablespoons salt to the bowls. Then we put the bowls in the freezer but by the next morning all the water had frozen.
So we decided to try the experiment again using more salt. We used 5, 6 and 7 tablespoons of salt in the bowls. We discovered that it took 7 tablespoons of salt for the water to not freeze. Five and six tablespoon made the water slushy.
Our hypothesis was correct but it took more salt than we originally thought. Our favorite part was when it came out of the freezer and we got to see it.
~Written by Katrina and Gabriella -Second Grade Scientists