Chemical Reactions and Enzymes Learning Objectives Explain how
Chemical Reactions and Enzymes
Learning Objectives § Explain how chemical reactions affect chemical bonds. § Describe how energy changes affect how easily a chemical reaction will occur. § Explain why enzymes are important to living things.
Chemical Reactions A chemical reaction changes one set of chemicals into another. reactants product reactant products
Energy in Reactions Chemical reactions that release energy often occur spontaneously. Chemical reactions that absorb energy require a source of energy. Which reaction can occur spontaneously? Activation Energy
Energy in Reactions Review Energy-absorbing Can occur spontaneously Requires more energy to get started Reactants Has a lower activation energy Will proceed more quickly
Enzymes lower activation energy and speed up chemical reactions in cells.
Enzymes in the Body Carbonic anhydrase speeds up this reaction by a factor of 10 million.
The Enzyme-Substrate Complex Substrates Product
Active Site The active site of the enzyme and the substrate have complimentary shapes. Substrate Enzyme
Active Site The active site of the enzyme and the substrate have complimentary shapes.
Enzyme! The Play Develop a short play or demonstration that illustrates how enzymes catalyze reactions.
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