1. Chemical Reactions and Enzymes

2. Iron + oxygen iron oxide
Chemical Reaction: a process that changes one set of chemical changes into another
Some occur very slowly: iron + oxygen= iron oxide (rust)
Reactants products…
Iron + oxygen iron oxide
Always involve changes in the chemical bonds that join atoms in compounds

3. In your own body!!
Involves carbon dioxide….

4. Energy is released or absorbed, meaning there is a change in energy
Energy in Reactions
Energy is released or absorbed, meaning there is a change in energy
Reactions that absorb energy will not occur without a source of energy
Reactions that release energy occur spontaneously
Example:
Example:
Energy released in the form of heat
Melting of an ice cube

5. Sources of Energy
Animals get their energy from consuming plants or other animals
Plants get their energy from the sun!

6. Where does that Energy GO…
breathing
Growth
Occur through chemical reactions that occur when humans metabolize, or break down digested food!!
dreaming
THINKING!!

7. YouTube - Black Eyed Peas - Let's Get Is Started
What is activation energy?
The energy required to get a reaction started
Enzymes:
What are they?
They are proteins
What do they do?
Acts as biological catalysts to speed up the rate of the reaction by lowering the activation energy
YouTube - Black Eyed Peas - Let's Get Is Started

8. Enzymes… Are very specific…
Part of an enzymes name is usually derived from the reaction that it catalyzes
Examples:
Lipase
Protease
Maltase
Sucrase
A chemical equation could look like this:
urease
UREA + H2O CO2 + NH3

9. How do Enzymes do their JOB?
Enzymes provide a site where reactants can be brought together to react
Reduces the energy needed for reaction
Substrates: the reactants of enzyme-catalyzed reactions
Once the reaction is over, the products are released and the enzyme is FREE to start the process again

10. Anatomy of an enzyme

11.
Animation of Enzyme Action

12. The lock and Key model
Lock and key

13. Factors that Affect Enzymes
Temperature
What temperature do you think enzymes work best in the body?
pH values
What pH values do you think enzymes work best in the body?
about body temperature
6-8

14. The pH scale