These are the materials we were using, gravel, powder, and salt.
This is what the gravel looked like when it was mixed with water. The gravel just sank to the bottom of the cup.
This is the salt when it was mixed with the water. The mixture became a solution because the salt dissolved, and after, the mixture was clear.
This is the powder when the water was added to it. The water was foggy with the powder.
Next we tried to separate the gravel from the water. We put it on the strainer, and as you can see, it separated like we wanted because the gravel pieces were to big to go through the screen.
This is the powder when we tried to seperate it. As you can see, the strainer did not work. The holes in the strainer were to big for the powder to seperate from the water, so the powder went through the screen.
This is the salt when we tried to seperate it, with the strainer. It did not work because the salt was to small and because it was dissolved.
This is how we tried to seperate the powder again. We used a paper filter instead.
When we opened the paper filter, this is what we saw. The powder had seperated from the water and it came out like this. Milky white. The powder particles were too big to go through the paper filter.
This is the salt when we tried to separate it from the water with a paper filter. We couldn't tell if it was seperated because the solution was clear.
This is the filter after the experiment was done. It's hard to tell, but the salt is not there, it went through the filter. Because the salt dissolved, the particles were so small that they could go through the paper filter.