1. Signs of Chemical Change and Factors that Affect Rates of Chemical Reactions Review for Quiz 6: Periodic Trends and Reactivity Notes: Chemical Reactions Revisited Lab: Factors that Affect the Rate of Chemical Change and Formation of a Precipitate

2. REVIEW Quiz 6: Periodic Trends and Reactivity Periodic Trends: Define each trend and explain why it occurs Atomic Mass Atomic Radius Electronegativity First Ionization Energy Reactivity of Metals: How can you tell which metal is more reactive? - Valence number - Displacement

3. Lab: Formation of a Precipitate and Factors that Affect the Speed of a Chemical Reaction Precipitate: A solid that forms as a result of a chemical reaction. Catalyst: A substance that affects the rate of chemical reaction but is not written as part of the chemical reaction because it is unchanged.

4. Lab: Formation of a Precipitate

5. Lab: Temperature and the Rate of a Chemical Reaction Does the temperature of the reactants affect the rate of the chemical reaction? Why or why not?

6. Lab: A Catalyst and the Rate of Reaction The Decomposition of Hydrogen Peroxide What is a catalyst? How does a catalyst affect the rate of a chemical reaction?

7. Notes: Factors that Affect the Rate of Reaction (copy in your notes) Temperature: – When temperature increases, molecules move ____________. When temperature decreases, molecules move _________________. – Increasing temperature ________________ the rate of reaction. Decreasing temperature _____________ the rate of reaction.

8. Notes: Factors that Affect the Rate of Reactions (copy in your notes) Catalyst: A substance that increases the rate of a chemical reaction but is not part of the reaction itself. It will not appear in the chemical reaction! – When a catalyst is added to reactants the rate of reaction _____________.