1. Compounds and Mixtures

2. What is a compound?  Compound: pure substance made up of two or more elements chemically combined.  Compound is formed as a result of a chemical Δ.

3. What are molecules?  Molecule: smallest part of a substance that has all the properties of the substance.  Pure substance: any element or compound.

4. Diatomic molecule  Diatomic molecule: a molecule that has two atoms of the same element joined together. O O Oxygen molecule

5. Combining atoms  Water is a compound made up of the elements hydrogen and oxygen. One molecule of water contains two atoms of hydrogen and one atom of oxygen.

6. Combining atoms  H 2 O is a compound made up of the elements H and O. 1 molecule of H 2 O contains 2 atoms of H and1 atom of O.

7. What are mixtures?  Mixture : two or more substances that have been mixed together but not chemically combined.  Mixture can be present in any amount.  You can separate mixtures using physical means  Boiling point, density, etc

8. Separating a mixture

9. How are compounds and mixtures different?

10. TYPES OF MIXTURES  Homogenous : A mixture in which the components are EVENLY mixed  Example: Kool-aid  Heterogeneous : A mixture where the components are not mixed evenly  Example: Salads, Some chocolate chip cookies

11. PERIODIC TABLE  You are going to be filling in your periodic table  This CAN be used on all future tests  To be useful, you will be adding information to the table throughout the semester  Start today by filling in the names of the elements