Lucci_Prelab7_Monday2pm

State a testable hypothesis for you speculation from

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State a testable hypothesis for you speculation from item 8 above, using the above equipment. If the alcohol concentration is below the 12%-14% initially, then the activated yeast will produce alcohol until that concentration is reached. If the solution is at or higher than 12%-14%, then the alcohol will kill off the activated yeast & the concentration will remain the same. 10. What volume of 100% alcohol do you need to make concentration of 16% alcohol? 1.6mL 11. What is your dependent variable? Independent variable? Dependent – alcohol production Independent – initial alcohol concentration & time Exercise 7.2 12. What is the objective of this exercise? A) To measure oxygen consumption of pea seeds during aerobic cellular respiration. B) To measure carbon dioxide production during germination in peas. 13. What is the purpose of KOH (potassium hydroxide) in this exercise? To absorb the carbon dioxide produced during aerobic cellular respiration. 14. What is the purpose of the heat-killed peas? To provide a control variable and measure oxygen consumption in aerobic cellular respiration on dead cells, which should be virtually non-existent. Exercise 7.3 15. What is the precipitate formed when barium hydroxide reacts with carbon dioxide? BaCO 3 – Barium carbonate
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