D Question 5 10 pts Percent recovery is the same thing as percent yield True Fal
ID: 1080808 • Letter: D
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D Question 5 10 pts Percent recovery is the same thing as percent yield True False D Question 6 10 pts Why is an Erlenmeyer flask the ideal flask for recrystallization when attempting to recrystallize more than 100 mg? No flask is preferred, as all flasks are equivalent in terms of recrystallization at this scale. O A wide beaker is preferred over an Erlenmeyer flask as it is easier to remove solids from a beaker. Its shape minimizes the evaporation of the solvent. O It is easier to hold when hot then a beaker. D Question 7 10 pts Why is it important to immediately place the heated flask in the ice bath as soon as you remove it from the steam bath. O Allowing the solvent to cool slowly will prevent recrystallization via thermodynamic equilibrium. O The dramatic temperature change is necessary to induce crystal formation. O This will cause the crystal to form faster and with greater purity THIS STATEMENT IS WRONG! You always allow the flask to cool at room temperature before placing in the ice bath because placing a hot piece of glassware in a cold ice bath will likely shatter the glass.Explanation / Answer
5. False Percent recovery is not the same as percent yield. Percent recovery is used when there is no chemical reaction, just the physical purification of a sample. Percent yield is used when there is a chemical reaction.
6. It has a conical shape and a neck which when swirling the hot solution without flashing the solution. So the selected answer is correct.
7. Again the selected answer is correct. Further, fs rapidly cooled, impurities may be trapped in the crystals because of the rapid precipitation.
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