2.4 chemical reactions and enzymes\nlesson objectives\n- explain how chemical reactions affect chemical…

2.4 chemical reactions and enzymes\nlesson objectives\n- explain how chemical reactions affect chemical bonds.\n- describe how energy changes affect how easily a chemical reaction will occur.\n- explain why enzymes are important to living things.\nlesson summary\nchemical reactions everything that happens in an organism is based on chemical reactions. a chemical reaction is a process that changes one set of chemicals into another set of chemicals.\n- the elements or compounds that enter into the reaction are the reactants.\n- the elements or compounds produced by the reaction are the products.\n- chemical reactions involve changes in the chemical bonds that join atoms in compounds.\n- some chemical reactions release energy; others absorb energy.\nenergy in reactions\n- chemical reactions that release energy often occur on their own.\n- chemical reactions that absorb energy require a source of energy. the energy needed to get a reaction started is called the activation energy.\nenzymes an enzyme is a protein that acts as biological catalyst. a catalyst is a substance that speeds up the rate of a chemical reaction. catalysts work by lowering a reactions activation energy.\n- in an enzyme - catalyzed reaction, the reactants are known as substrates. substrates bind to a part of an enzyme called the active site and remain bound to the enzyme until the reaction is complete, when the products are released.\n- temperature, ph, and regulatory molecules can affect the activity of enzymes.\nchemical reactions\n1. what is a chemical reaction?\n2. complete the table about chemicals in a chemical reaction.\nchemicals in a chemical reaction\n| chemicals | definition |\n|--|--|--|--|--|--|--|\n| reactants | |\n| products | |

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