Week 7 Functional Biology
Week 7 Functional Biology 1330
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This 1 page Class Notes was uploaded by Zaida Gomez on Tuesday October 11, 2016. The Class Notes belongs to 1330 at Texas State University taught by Aglaia Chandler in Fall 2016. Since its upload, it has received 4 views. For similar materials see Functional biology in Life and Physical Sciences at Texas State University.
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Date Created: 10/11/16
Chemical Equilibrium 1. Reaction begins No products are formed yet High rate of collisions Rate of forward reaction HIGH 2 & 3. Products formed collisions between reactants decrease Rate of forward reaction decreases Reverse reaction begins 4. Rate of forward reaction equal to rate of reverse reaction Dynamic equilibrium established Concentrations constant Le Chatelier’s Principle If a system at equilibrium is subjected to a stress, the equilibrium will shift in attempt to reduce the stress. aA + bB <--> cC + dD Upper case letters represent reactants and products Lower case letter are the coefficients that balance the equation Factors that Affect a Chemical Reaction at Equilibrium Changes in: 1. Concentration change (up/down) 2. Temperature (up/down) 3. Pressure - lower the pressure by increasing the volume - raise the pressure by decreasing the volume - raise the total pressure by adding an inert (non-reacting) gas 4. Adding a catalyst The Chemistry of Blood - Oxygen is transported around the body in blood by the complex molecule haemoglobin (hemoglobin) - When hemoglobin reacts with oxygen, oxyhaemoglobin (oxyhemoglobin) is formed - The oxygenation of blood is an equilibrium reaction Oxygen Transport - The equilibrium reaction for the transport of oxygen by heomoglobin (Hb) can be represented as: Hb(aq) + O2(aq) -> HbO2(aq) Hb4(aq) +4O2(aq)-> Hb4O8(aq) - In the lungs where there is a high concentration of oxygen, by Le Chatelier’s principle the equilibrium position shifts to the right resulting in the formation of oxyheomoglobin (oxyhemoglobin) - In tissues the concentration of oxygen is lower, so the equilibrium position shifts to the left, by Le Chatelier’s principle. Oxyhaemoglobin releases oxygen to re-form haemoglobin.
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