Bio Chapter 2.2: The Chemistry of Living Things PDF

2 The Chemistry of Living Things  2.2 THE CHEMICAL PROCESSES OF LIFE  2.2 Objectives Compare chemical and physical changes. Relate Brownian motion to diffusion and the dissolving process. Compare what happens during exothermic and endothermic reactions. Compare the actions o...

2 The Chemistry of Living Things  2.2 THE CHEMICAL PROCESSES OF LIFE  2.2 Objectives Compare chemical and physical changes. Relate Brownian motion to diffusion and the dissolving process. Compare what happens during exothermic and endothermic reactions. Compare the actions of catalysts and inhibitors.  2.2 Objectives Explain how chemistry can be used to help living things, especially people. ESSENTIAL QUESTION ? How do chemical processes keep life going? 1. Is this an example of a physical change or a chemical change? How ? do you know? 2. What causes the dye to spread throughout the water? 3. Why does the dye diffuse more quickly in the hot water? 4. What other factors do you think affect diffusion? ? 1. In this solution, what is the solute? What is the solvent? ? 2. Is there a difference in weight between salt water and fresh water? Why? 3. How do you think this will affect diffusion? 1. What do you notice about the dye in the salt water? ? 2. What causes the dye to float at the top of the water? 3. What other factors do you think might affect diffusion? Solutions Water (solvent) molecules tear apart the salt crystal (solute) until it is completely dissolved in the solution. Solutions Water (solvent) molecules tear apart the salt crystal (solute) until it is completely dissolved in the solution. Solutions An acid is a substance that dissolves in water + to form hydrogen ions (H ). A base is a substance that dissolves in water to – form hydroxide ions (OH ) or other ions like – – chloride (Cl ) or fluoride (F ) that can accept hydrogen ions. Diffusion On the basis of what you saw, how would you define diffusion?  Brownian motion the tendency that particles have to move around and spread out  diffusion the process by which particles in solution are evenly distributed throughout the solvent by Brownian motion Chemical Equations C6H12O6 (aq) + 6O2 (g) 6H2O (g) + 6CO2 (g) glucose oxygen water carbon dioxide reactants products Chemical Equations C6H12O6 (aq) + 6O2 (g) 6H2O (g) + 6CO2 (g) +energy exothermic reaction Chemical Equations 6H2O (l) + 6CO2 (g) + energy C6H12O6 (aq) + 6O2 (g) endothermic reaction Endo or Exo? I Notice, I Wonder Write down what you notice about the graph and what you have questions about.  ? Is this a good analogy for the way enzymes work? Catalysts and Inhibitors  Chemistry in Our World How does what we’ve learned today relate to our daily lives? What are some ways that knowledge of chemistry can help other people?  Chemistry in Our World What are some ways that chemistry could harm people if used incorrectly? What responsibility do you think Christians have to use their knowledge of chemistry wisely? Demonstrate how enzymes work by sketching a cartoon, comic, or other illustration of an enzyme facilitating or inhibiting a chemical reaction. Use the following words: enzyme, inhibitor, catalyst, substrate, active site, and chemical reaction.  Exit Ticket What are two ways that chemistry can be applied to your daily life? Why do you think people, especially Christians, should value the study of chemistry? How can chemistry benefit other people? How could it harm others if used improperly or apart from a biblical worldview?  ESSENTIAL QUESTION How do chemical processes keep life going? Chemical reactions power living things by ? providing them with nutrients, minerals, energy, and more.