We started our new science unit this week, Mixtures and Solutions. We began by exploring what mixtures and solutions are, and discussing how they are similar and different. Students created three water mixtures, by adding pebbles, salt and diatomaceous earth to cups with water. They then tried to separate the mixtures, using screens and filters. They found that they were able to separate the pebbles with the screen and the diatomaceous earth with the filters, but the salt didn’t separate. This is because the salt dissolved and became a solution. Below are some pictures of their investigations.