1. Chemical Reactions, Energy & enzymes

2. Endothermic & Exothermic Reactions
Reactions that absorb energy are endothermic. (endergonic)
Ex: making glucose.
Exothermic: Reactions that release energy (exergonic)
Ex: breaking down glucose

3. Chemical Reactions And Activation Energy
Activation energy is needed to start the chemical reaction.
Catalysts reduce the amount of activation needed.
Activation energy

4. Enzymes reduce activation energy
Catalysts
Enzymes are biological catalysts used by cells.
Enzymes are proteins produced by the cell.
Enzymes reduce activation energy

5. Enzyme - substrate complex
Enzyme function depends on the physical fit to a substrate.
The substrate is the reactant
The enzyme and substrate must match like a lock and key.
Enzyme - substrate complex

6. Reaction rate
There are many factors that can change the rate of a reaction.
Concentration of reactants, surface area, temperature, pH, and enzyme concentration.

7. enzymes have optimal conditions
Change in pH or temperature can effect function.
80˚ C will change the enzyme’s shape.
Acids or bases can alter enzymes shape.