Chemical Reactions/Enzymes Chapters 2.4, .5

Chemical Reactions 6O2 + C6H12O6  6CO2 + 6H2O A chemical reaction is a change of a substance into a different substance by breaking and forming chemical bonds. This chemical process changes a reactant into a product through this chemical reaction. 6O2 + C6H12O6  6CO2 + 6H2O Reactant + Reactant  Product

Catalysts or Enzymes All chemical reactions need energy. Energy needs to be absorbed by the reactants for a chemical process to occur. This energy is called the activation energy for that chemical reaction.

Enzymes A catalysts is a substance or individual that causes a process to move faster. An enzyme is a catalysts in a living organism that causes a biological, chemical reaction to go at a faster rate.

Enzymes Enzymes lower the activation energy needed to cause a chemical reaction to use less energy. Enzymes lower the activation energy.

Activation Energy

Enzymatic Reactions Enzymatic reactions may be endothermic, meaning they need energy or heat to proceed or they may be exothermic, meaning they give off heat when the reaction occurs.

Chemical Reactions A chemical reaction, driven by an enzyme results in the production of products from reactants or substrates.

Chemical Reactions

Lock-and-Key model Enzymes bind to specific sites called activation sites. This is a specific site specially for a specific enzyme and substrate. This model is called the lock-and-key model as to how enzymes work.

Substrates (reactants)  Product Activation Site Substrates (reactants)  Product

Substrates/Reactants and Products

The End