1. Chemical Properties and Changes

2. Chemical Properties Properties that change the chemical nature of matter Can not be determined by touching or viewing the sample

3. Examples of Chemical Properties Heat of Combustion Reactivity with other chemicals pH Flammability Electronegativity: ability to gain electrons from other chemicals when forming a compound Ionization: ability to lose electrons when forming compounds

4. Chemical Properties of the Periodic Table Metals: Low ionization energies, low electronegativity Transition Metals: Low ionization energies, Positive oxidation states, highly reactive Non-Metals: High electronegativity, flammable Nobel Gases: Non-reactive

5. Chemical Changes The composition of the matter always changes Also known as a Chemical Reaction Words that indicate chemical changes are “reacts, burn, rot, rust, decompose, ferment, explode, and corrode”

6. Chemical Reactions In a chemical reaction, the substance at the beginning is called a reactant and the end result is a product. H 2 O  H 2 + O 2 Reactants  Products

7. Clues to a Chemical Change/Reaction energy transfer, a color change, the production of a gas, or the forming of a precipitate. A precipitate is a solid that forms and settles out of a liquid mixture during a reaction.

8. Law of Conservation of Mass Mass can neither be created nor destroyed This means that during a chemical change or reaction the mass of the products is always equal to the mass of the reactants