All matter is composed of either elements or compounds. Elements are made of only one type of atom, while compounds contain two or more elements chemically bonded together. Matter can also exist as substances, which are either elements or compounds, or as mixtures of multiple substances. Mixtures are not uniform and their components can be separated, while substances cannot be decomposed further. There are two main types of mixtures: homogeneous mixtures which are uniform, and heterogeneous mixtures where the components are not evenly distributed and can be seen separately.

1. Composition of Matter

2. All matter is made up of atoms. Elements - when all the atoms in the matter are the same. There are 118 elements. Ex: Carbon and Oxygen

3. Compounds Compounds - matter that is made up of 2 or more combined elements. Compounds look different than the elements that make them up.

4. Compound Ex: Ex: H & O = H 2 O C & O = CO 2 C,H & O = C 6 H 12 O 6

5. Substance Substance - matter that is either an element or a compound.

6. Mixture Mixture - material that is made up of 2 or more substances that can be separated physically.

7. 2 Types of Mixtures Heterogeneous Homogeneous

8. Heterogeneous Mixtures Heterogeneous Mixture- mixture that is unevenly mixed. You can see the stuff in the mixture.

9. Heterogeneous Mixture Ex:

10. Homogeneous Mixture Homogeneous Mixture- mixture that is evenly (uniformly) mixed. Homogeneous Mixtures are also called solutions .

11. Homogeneous Mixture Ex:

12. Matter Substance Mixture Element Compound Homogeneous Heterogeneous

13. Colloid Colloid - a heterogeneous mixture that never settles. Ex: milk or fog

14. Suspension Suspension - heterogeneous mixture that contains a liquid where visible particles settle.

15. Suspension Examples

16. Tyndall Effect Tyndall Effect- the scattering of light by particles in a mixture.

17. Tyndall Effect Ex:

18. What do you have? YES YES NO Does it scatter light? YES NO NO Can it be filtered? YES NO NO Does it settle? Suspension Colloid Solution