1. Classification of Matter

2. Chemistry Chemistry- ▫The study of matter and the changes it undergoes Matter ▫Anything that has mass and volume

4. Pure Substances Cannot be separated by physical means Every sample has the same characteristics and they can be used to identify a substance

5. Elements Are made up of ONE type of atom ▫Atoms are the smallest unit of an element that maintains the chemical identity of that element They can be found on the Periodic Table Examples: Carbon, Nitrogen, Calcium

6. Compounds Can be broken down into simple stable substances Are made up of two or more types of atoms that are chemically bonded Examples: Water (H 2 O), sugar (C 12 H 22 O 11 )

7. Mixtures A blend of two or more kinds of matter, each which retains its own identity and properties

8. Homogeneous Mixtures Have uniform composition Also known as SOLUTIONS Examples: salt water, tea

9. Solutions ALLOYS are solid solutions that contain at least 1 metal They are blended together so that they have more desirable properties Some alloys you may know are:  Stainless Steel: iron, chromium, and zinc  Brass: zinc and copper  Bronze: tin and copper  Sterling Silver: copper and silver

10. Heterogeneous Mixtures Do not have uniform composition You can see the particles in them Examples: ▫Sand on the beach (contains sand, shells, rocks, bugs, etc) ▫Soil (contains dirt, rocks, worms, etc) ▫Chicken Soup (contains water, chicken, veggies etc)

11. Suspensions A heterogeneous mixture where the solid particles eventually settle out of solution Examples: ▫Muddy water ▫Mixtures of two solids ▫Paint

12. Colloids Are sometimes mistaken for solutions Particles do not settle out of solution To the naked eye, they appear homogeneous, but upon closer inspection the particles can be seen Light will bounce off the particles floating in the solution and cause light to scatter, this is called the Tyndall Effect

13. Tyndall Effect

14. Colloids