Review for Natural Science test

Here is a PowerPoint I made to help you review for your test tomorrow. Good luck!

Pure substances, mixtures, chemical changes from Kathleen Marcy

Decantation

Decantation is used to separate:

-- a solid from a liquid (sand and water)

--two liquids of different densities (oil and water)





Decantation to separate a solid from a liquid:





Decantation to separate two liquids of different densities:

Magnetic separation

Here is a machine that uses magnets to separate wood from nails.





and to separate iron from sand:





and for recycling: