Chemical Reactions A chemical reaction is a process that changes one set of chemicals into another by rearranging chemical bonds The elements you start with are reactants The elements you end with are ID: 733286
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Lesson 2.4: Chemical Reactions & Enzymes Slide2
Chemical Reactions:A chemical reaction is a process that changes one set of chemicals into another by rearranging chemical bonds
The elements you start with are
reactants
The elements you end with are productsSlide3
Chemical Reactions:Exothermic Reaction- chemical
reactions that release energy
into surroundings; usually occur spontaneously
Endothermic Reaction- chemical reactions that absorb
energy from surroundings; usually require a
source of energySlide4
Chemical Reactions:The energy that is needed to get a reaction started is called the activation energy
Activate = start Slide5
Chemical Reactions:Some chemical reactions are too slow or have activation energies that are too high to make them practical for living tissue
Catalysts
speed up reactions by lowering the
activation energySlide6
Enzymes are proteins that act as biological catalystsEnzymes speed up chemical reactions in cells
Enzymes
:Slide7
Enzyme- Substrate Complex: The reactants of enzyme-catalyzed reactions are known as substrates
Enzymes break down substrates into the productsSlide8
Enzyme- Substrate Complex: The substrates bind to a site on the enzyme called the active siteThe fit is so precise that the active site and substrates are often compared to a lock and keySlide9
Enzyme Activity: Temperature and pH can denature enzymes, preventing it from working
Presence of other molecules can also affect enzymatic activitySlide10
Enzyme Examples: