1. Chapter 4.4

2. * Energy is needed to break bonds * Law Conservation of Energy- Energy cannot be created or destroyed. * It can change forms

3. * Exo means “exit” * Thermic means “Heat” or “Energy” * Define Exothermic * How does an exothermic reaction feel?

4. * Endo means “go in” * Thermic means “heat” or “energy” * Define Endothermic * How does an endothermic reaction feel?

5. * Activation Energy: Smallest amount of energy that is required for molecules to react * Striking a match * Friction is a source of activation energy

6. * Catalyst- speeds up a reaction by lowering the amount of energy needed so that a reaction can happen more easily. * Are not actually part of the products or reactants. Enzymes in the body are catalysts too!

7. * Inhibitor- slows down a reaction

8. Temperature * At high temperatures, particles of reactants move quickly. * The higher the temperature……

9. Concentration * A measure of the amount of one substance dissolved in another substance. * There is a small distance between particles with a high concentration * The higher the concentration……

10. Surface Area * The amount of exposed surface of a substance * Grinding a solid into a powder makes a larger surface area * The greater the surface area……

11. Inhibitor vs. Catalysts * Inhibitor: substance that slows down or stops a reaction. * Preservatives * Catalyst: substance that speeds up a reaction without being permanently being changed * Not a reactant * Enzymes * Catalytic Converter