University:
Missouri State University
Course:
CHM 160 | General Chemistry I
Academic year:

2021
Views:

166

Pages:

16
Author:

Carly Preston

Chemical reactions involve forming or breaking of chemical bonds Na + Cl NaCl Reactants Products The chemicals involved at the start of a reaction The chemicals produced at the end of a reaction Chemical Reactions  Need help to get started  Ex. Match starts a fire  Activation Energy  Energy required to get a chemical reaction started Activation Energy ACTIVATION ENERGY REACTANTS PRODUCTS A catalyst can reduce the activation energy needed to start a reaction.  Speeds up the reaction  Not consumed  Reusable Chemical reactions  Catalysts help chemical reactions happen faster  Work by decreasing the amount of activation energy required to get a chemical reaction started Some reactions absorb energy while others release energy. Enzymes  Proteins that act as catalysts to control chemical reactions  Are NOT changed when they perform task  Used again and again Specificity  Fit like a “lock and key”  VERY specific  Each has only ONE reaction it can help  Shape determines function ENZYME ACTIVE SITE SUBSTRATE ENZYME-SUBSTRATE COMPLEX ENZYME Unchanged & Reusable PRODUCTS Factors that effect enzymes  Conditions that are too hot or too acidic cause proteins to unwind or denature  Denaturing changes the shape of the active site  Enzyme can’t bind to substrate  Homeostasis (temp and pH) important for enzyme function Naming enzymes  Most end in _______-ase  Beginning tells what it does  Examples:  Lipase-breaks down lipids  Sucrase-breaks down sucrose  DNA polymerase-polymerizes DNA  Lactase-breaks down lactose  Protease-breaks down proteins Homework: Biochemistry review Homework: Read Section 7.1 and complete