5. On the report sheet, you calculated your percent recovery of caffeine. a. If your percent was less than 90%, give at least one reason why it was less. b. A group of students have their percent yield more than 100%, give at least one reason why it was more than 100%. Do NOT simply say “human error.” Be specific about the types of errors (human or otherwise) that may have occurred, leading to a recovery more than eor equal to 100% (Is this possible Why?) 6. Based on what you observed during this experiment, is dichloromethane denser OR less dense than water? Explain your reasoning. 7. Based on what happened in this experiment, is caffeine more soluble in water OR more soluble in dichloromethane? Explain your reasoning.
5. On the report sheet, you calculated your percent recovery of caffeine. a. If your percent was less than 90%, give at least one reason why it was less. b. A group of students have their percent yield more than 100%, give at least one reason why it was more than 100%. Do NOT simply say “human error.” Be specific about the types of errors (human or otherwise) that may have occurred, leading to a recovery more than eor equal to 100% (Is this possible Why?) 6. Based on what you observed during this experiment, is dichloromethane denser OR less dense than water? Explain your reasoning. 7. Based on what happened in this experiment, is caffeine more soluble in water OR more soluble in dichloromethane? Explain your reasoning.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Question
Extraction of Caffeine Post-lab
5. On the report sheet, you calculated your percent recovery of caffeine.
a. If your percent was less than 90%, give at least one reason why it was less.
b. A group of students have their percent yield more than 100%, give at least one reason
why it was more than 100%. Do NOT simply say “human error.” Be specific about the types
of errors (human or otherwise) that may have occurred, leading to a recovery more than eor
equal to 100% (Is this possible Why?)
6. Based on what you observed during this experiment, is dichloromethane denser OR less
dense than water? Explain your reasoning.
dense than water? Explain your reasoning.
7. Based on what happened in this experiment, is caffeine more soluble in water OR more
soluble in dichloromethane? Explain your reasoning.
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