Filtration

Question 1

What does filtration do ?

Answer 1

It separates a liquid from an insoluble solid. It also separates a solution from a solid that is mixed with it but not dissolved.

Question 2

2 types of mixture that can be separated by filtration

Answer 2

Sand and water

Cornflakes and milk

Question 3

How does filtering work ?

Answer 3

You can separate sand from water by pouring the mixture into filter paper. Water passes through the filter paper. Sand does not. Filter paper has tiny holes in it. Water particles are smaller than the tiny holes. The water that passes through is the filtrate and the sand that remains on the filter paper is the residue.

Question 4

3 uses of filtration

Answer 4

To separate coffee solution from ground up coffee beans.
To separate the dirt from the oil in cars.
Sand Filters help make water safe to drink : river water passes through sand and gravel. As water moves downwards bits of dirt get stuck in the sand. Tiny creatures in the sand remove bacteria. Water leaving the filter is nearly ready to drink

Question 5

If you have a mixture of sand and salt you can separate sand like this :

Answer 5

Add water to the mixture.
Stir. The salt dissolves. The sand does not. Pour the mixture into a filter paper funnel. Salt solution passes through the paper. The residue is sand.