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chem_2009_Exam3 KEY - Name Part B(34 points COMPETENCY...

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Name 7 Part B (34 points) COMPETENCY QUESTIONS (CONTINUED) Answer TWO of the following three questions in the space provided. SHOW YOUR WORK AND WRITE EXPLANATIONS IN FULL SENTENCES . 4. (17 points) The enzyme invertase catalyzes the hydrolysis of sucrose, a disaccharide, to glucose and fructose. RXN 1 Sucrose Æ glucose + fructose The equimolar glucose/fructose mixture is called invert sugar, hence the name of the enzyme. a) (4 points) For this reaction, estimate whether Δ S SYS is larger or smaller than zero and explain in one sentence? The reaction increases the number of molecules, thus increasing entropy b) (6 points) The reaction rate (velocity) of enzyme reactions usually increases when the temperature is raised from room temperature but then quickly decreases and reaches zero at moderate temperatures (50-80 °C). This appears to contradict the Arrhenius equation, which predicts that reaction rates always increase with temperature. Briefly explain this apparent discrepancy?
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