2. Chemical Reactions and Enzymes 2-4 Pg 49

3. What is a chemical reaction? Changes or transforms chemicals into other chemicals Ex: Iron + Oxygen  Iron Oxide (rust) Physical Science Review What is the product? What are the reactants?

4. Energy Is Required Energy can be either given off or absorbed for a chemical reaction to occur Identify the type of reaction as either endothermic or exothermic by the graphs to the right:

5. Activation Energy Energy needed to start a reaction Identify the activation energy supplied for the following chemical reactions 1)Building a Fire 2)Turning on a Light 3)Starting a Car

6. Enzymes Enzymes Baby!!!!!! Enzymes Enzymes are proteins made by cells to speed up reactions (catalyst) Describe what enzymes “do” using the graph below:

7. Properties of Enzymes Properties of Enzymes 1.Lowers activation energy 2.Speeds up a reaction 3.Can be used repeatedly 4.Shape specific (substrate) *If shape is altered, enzyme cannot function View Animation

10. Factors That Affect Enzyme Activity Temperature pH Concentration *Use the book to explain “how” these factors affect activity (p 53)