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Reminders

Reminders. Biospheres! Week 5. Question of the Day. Question: How are acids and bases different? Take your best guess! Answer: … … …. 4 ’s Turn In: p . 53 A.Q. 1ab, 3abc Inv. 4.3: Liver Lab. pH. pH scale - measure of H + ions (acidity); “ p ower of h ydrogen”. #10.

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Reminders

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  1. Reminders • Biospheres! Week 5

  2. Question of the Day Question: How are acids and bases different? Take your best guess! Answer: … … … • 4’s Turn In: • p. 53 A.Q. 1ab, 3abc • Inv. 4.3: Liver Lab

  3. pH • pH scale- measure of H+ ions (acidity); “power of hydrogen” #10. H + = hydronium ion OH- = hydroxide ion

  4. pH • acid- lots of H+ ions • taste sour • feel watery #11.

  5. pH • base- lots of OH- ions • taste bitter • feel slippery #12.

  6. pH • neutral- equal amounts of H+ and OH- ions • Ex: water • neutralize- combining an acid and a base to form water #13.

  7. pH • buffer- any substance that resists a change in pH • Many life biological reactions have a small pH range • Example: blood (pH 7.35 – 7.45) • buffering capacity- the ability to resist a change in pH #14. #15.

  8. p. 53 A.Q. 1ab, 3abc 1a. What happens to chemical bonds during chemical reactions? 1a. During chemical reactions, the bonds change—they are formed or broken. 1b. Why is the melting of ice not a chemical reaction? 1b. The melting of ice is not a chemical reaction because new chemicals are not formed. 3a. What are enzymes? 3a. Enzymes are proteins that act as biological catalysts.

  9. p. 53 A.Q. 1ab, 3abc 3b. Explain how enzymes work, including the role of the enzyme-substrate complex. 3b. Enzymes provide a site where reactants, called substrates, can be brought together to react. The substrates bind to a site on the enzyme called the active site, forming an enzyme-substrate complex. This reduces the activation energy needed for the reaction. 3c. A change in pH can change the shape of a protein. How might a change in pH affect the function of an enzyme such as carbonic anhydrase? 3c. A change in pH might affect the function of an enzyme such as carbonic anhydrase because the change in pH could change the shape of the enzyme. If the enzyme and substrates no longer fit properly, the enzyme would no longer be able to speed up the chemical reaction.

  10. Inv. 4.3: Catalase & H2O2 • Concentration: more enzymes = faster

  11. Inv. 4.3: Catalase & H2O2 • Concentration: more enzymes = faster • Temperature: catalase functions at a wide range of temperatures; too hot would denature Enzymes Have a Range:

  12. Inv. 4.3: Catalase & H2O2 • Concentration: more enzymes = faster • Temperature: catalase functions at a wide range of temperatures; too hot will denature • pH:catalase functions at a wide range of pH values; too extreme will denature Enzymes Have a Range:

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