chemical reactions involve forming or breaking of chemical bonds na + cl nacl reactants products the...
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Energy and Chemical Reactions
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OBJECTIVES: RELATE ENERGY AND CHEMICAL REACTIONS DESCRIBE THE ROLE OF ENZYMES
DO NOW: Take out your homework. Then…is cellulose a monosaccharide or polysaccharide? Where is it found?
HOMEWORK: finish concept 5 packet Review sheet due Moday.
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Chemical reactions involve forming or breaking of chemical bonds
Na + Cl NaCl
Reactants ProductsThe chemicals involved The chemicals at the start of a reaction produced at the
end of a reaction
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Chemical ReactionsNeed help to get started
Ex. Match starts a fireActivation Energy
Energy required to get a chemical reaction started
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Activation Energy
REACTANTSPRODUCTS
ACTIVATIONENERGY
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A catalyst can reduce the activation energy needed to start a reaction.Speeds up the reactionNot consumedReusable
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Chemical reactionsCatalysts help chemical reactions happen
fasterWork by decreasing the amount of
activation energy required to get a chemical reaction started
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Some reactions absorb energy while others release energy.
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EnzymesProteins that act as catalysts to control
chemical reactionsAre NOT changed when they perform task
Used again and again
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Specificity Fit like a “lock and key”
VERY specificEach has only ONE reaction it can helpShape determines function
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SUBSTRATE
ENZYME-SUBSTRATE COMPLEX
PRODUCTSENZYMEUnchanged& Reusable
ENZYME
ACTIVESITE
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Animationshttp://highered.mcgraw-hill.com/sites/007294369
6/student_view0/chapter17/animation__enzyme_action_and_the_hydrolysis_of_sucrose.html
http://www.lpscience.fatcow.com/jwanamaker/animations/Enzyme%20activity.html
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Factors that effect enzymesConditions 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
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Naming enzymesMost end in _______-aseBeginning tells what it doesExamples:
Lipase-breaks down lipidsSucrase-breaks down sucroseDNA polymerase-polymerizes DNALactase-breaks down lactoseProtease-breaks down proteins
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OBJECTIVES: RELATE ENERGY AND CHEMICAL REACTIONS DESCRIBE THE ROLE OF ENZYMES
DO NOW: Take out your homework. Then…Where are electrons, protons, and neutrons located? How many protons does an atom with an atomic number of 9 have? Neutrons?
HOMEWORK: Review sheet, test Tuesday
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Do Now: Review your notes for quiz
Homework: Biochemistry review
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Warm Up: Review notes quietly for 5 minutesHomework: Read Section 7.1 and complete