Biology

Chapter 2.4-2.5 Guided Notes

  1. Life depends on chemical reactions
  2. Bonds break and form during chemical reactions.
  3. Chemical reactions change substances into different ones by breaking and forming chemical bonds.
  4. Reactants are changed during a chemical reaction.
  5. Products are made by a chemical reaction.
  6. Bond energy is the amount of energy that breaks a bond.
  7. Energy is added to break bonds.
  8. Energy is released when bonds form.
  9. A reaction is at equilibrium when reactants and products form at the same rate.
  10. Chemical reactions release or absorb energy.
  11. Activation energy is the amount of energy that needs to be absorbed to start a chemical reaction.

  1. Exothermic reactions release more energy than they absorb.
  2. Reactants have higher bond energies than products.
  3. Excess energy is released by the reaction.
  4. Endothermic reactions absorb more energy than they release.
  5. Reactants have lower bond energies than products.
  6. Energy is absorbed by the reaction to make up the difference.
  1. Enzymes are catalysts for chemical reactions in living things.
  2. A catalyst lowers activation energy.
  3. Catalysts are substances that speed up chemical reactions.
  4. decrease activation energy
  5. increase reaction rate

  1. Enzymes allow chemical reactions to occur under tightly controlled conditions.
  2. Enzymes are catalysts in living things.
  3. Enzymes are needed for almost all processes.
  4. Most enzymes are proteins.
  5. Disruptions in homeostasis can prevent enzymes from functioning.
  6. Enzymes function best in a small range of conditions.
  7. Changes in temperature and pH can break hydrogen bonds.
  8. An enzyme’s function depends on its structure.
  9. An enzyme’s structure allows only certain reactants to bind to the enzyme.
  10. substrates
  11. active site
  12. The lock-and-key model helps illustrate how enzymes function.
  13. substrates brought together
  14. bonds in substrates weakened

Biology

Chapter 2.4-2.5 Guided Notes

  1. Life depends on ______
  2. Bonds ______and form during chemical reactions.
  3. Chemical reactions change substances into different ones by breaking and forming chemical bonds.
  4. ______are changed during a chemical reaction.
  5. ______are made by a chemical reaction.
  6. Bond energy is the amount of energy that breaks a bond.
  7. Energy is added to ______bonds.
  8. Energy is released when bonds ______.
  9. A reaction is at ______when reactants and products form at the same rate.
  10. Chemical reactions release or absorb energy.
  11. ______is the amount of energy that needs to be absorbed to start a chemical reaction.

  1. ______reactions release more energy than they absorb.
  2. Reactants have higher bond energies than products.
  3. Excess energy is released by the reaction.
  4. ______reactions absorb more energy than they release.
  5. Reactants have lower bond energies than products.
  6. Energy is absorbed by the reaction to make up the difference.
  1. ______are catalysts for chemical reactions in living things.
  2. A catalyst______activation energy.
  3. Catalysts are substances that speed up chemical reactions.
  4. ______activation energy
  5. ______reaction rate
  1. Enzymes allow chemical reactions to occur under tightly controlled conditions.
  2. Enzymes are catalysts in living things.
  3. Enzymes are needed for almost all processes.
  4. Most enzymes are ______.
  5. Disruptions in ______can prevent enzymes from functioning.
  6. Enzymes function best in a small range of conditions.
  7. Changes in ______and pH can break hydrogen bonds.
  8. An enzyme’s function depends on its ______.
  9. An enzyme’s structure allows only certain reactants to bind to the enzyme.
  10. ______
  11. ______
  12. The ______helps illustrate how enzymes function.
  13. substrates brought together
  14. bonds in substrates weakened