Margaret D. Andrews
-
1. Set up your soil filters as follows: Put the filter papers inside the funnels. In one funnel, place several tablespoons of sand into the filter paper. In the second funnel, place several tablespoons of potting soil into the filter paper.
-
2. Place the two soil filters over two of the jars.
-
3. Fill the third jar half full of water and add one teaspoon of sugar. Shake the mixture well. Describe the results in the “Before” column on the worksheet.
-
4. Pour half of the mixture into each of the funnels. Describe the results in the “After” column on the worksheet.
-
5. Empty the two jars and repeat the experiment three times with the following mixtures:
-
____
- 3 drops food coloring in a half jar of water
-
____
- 1 teaspoon vegetable oil in a half jar of water
-
____
- a half jar of plain water
Record all your observations on the worksheet.
What is a more effective filter: sand or soil? ______
What substances were easy to filter out? ______
What substances were hard to filter out? ______
Was the plain water cleaner or dirtier after being filtered? ______
What do you think happened? ______
