This lesson is about the different ways you can separate materials.
You know that a physical change can be reversed. If you mix 2
different things together, like adding salt (NaCl)
to water (H2O),
that is a physical change. It can be reversed. You can
figure out how to reverse it by using the properties of matter.
Let's see how that works.
3. Words You Need To Know
There are 3 words you need to know: dissolve, soluble, and insoluble.
here and then click on the number 5
What does dissolving mean?
Revisewise and read the information on the first 4 screens.
What does soluble mean?
How do you separate soluble materials?
What does insoluble mean?
How do you separate insoluble materials?
4. So How do you separate
water from salt?
To separate a
liquid from a
solid in a solution:
liquid. This turns
the liquid into a gas.
Once all the liquid has evaporated, the
salt, which is a solid, will be left in the
will rise and hit the cold surface above. When the hot
gas molecules touch the cold surface it
will condense the gas and the
molecules turn from a gas back into a
5. Try It!
Click here to experiment with separating different mixtures.