please with these

1. Calculate the approximate percentage of caffeine in your tea, using the mass of the crude caffeine isolated and the mass of tealeaves added to the beaker. 10 pts 2. Why is the methylene chloride below the water layer? 5 pts 3. Do you think your mass of caffeine represents all of the caffeine originally in your tea leaves? 2pts 4. List two places where you could have "lost" some of your final caffeine (not including human error). 10pts 5. What is an emulsion? 5pts 6. Name at least two ways that a crude compound can be purified. 5pts 7. Define the term alkaloid and give two examples of compounds that are classified as such 11pts 8. You isolated 0.89 grams of Caffeine from 5 tea bags. If each tea bag weighs 3.3 g, what is the percent recovery of caffeine in the tea? 15pts