Data: 1. Percent yield based on expected extraction for the tea bags (See question sheet)

2. All functional groups labeled on the IR.

3. Expected Melting Point for a pure sample of Caffeine (See questions sheet)

1. What layer is caffeine found in? Why is that? Caffeine can be found in the organic layer. The organic reagent that is being commonly used for caffeine extraction is dichloromethane (DCM). The caffeine will go to the organic layer because caffeine has more solubility in DCM than water.

2. Hypothetically you extracted 78.3 mg of caffeine from 2 tea bags. Each bag of tea bags contains 56mg of caffeine. What is your percent yield for this reaction? To get the percent yield we used the equation of % yield = (actual yield) / (theoretical yield) x 100 since there's 56 mg of caffeine in each tea bag the theoretical yield is 56 mg x 2 = 112 mg.

% yield = (78.3) / (112) x 100

% yield = 69.9 %

3. What are the main peaks that caffeine would show on an IR? Main peaks that will appear in the IR spectra of caffeine:

3000 cm-1 amine stretch

3000 cm-1 sp2 C-H stretch

1700 cm-1 C=O stretch

1600 cm-1 C=C stretch

Conclusion:

1. List any observations for the experiment you noticed, details about caffeine or any other substance.

2. Based on calculated percent yield and data, and the video, was the experiment successful? Was the desired product obtained?

3. What potential sources of error could have occurred? DO NOT write human error! What is the human error, at what points in the experiment could product have been lost and resulted in low yield?

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

Is a measure of the resistance to flow. a high liquid has a high resistance to flow and flows slowly. the ancients thought everything in the world was made of 4 we now know that there are 94 naturally occurring and scientists have created another 24 i am certain they will create even more. honey flows slowly because it has a high to flowing. a can be separated by physical means because it contains more than one pure substance and 2 pure substances are not chemically bonded to each other. a cannot be separated by physical means. all matter is made up of all elements are with the same number of protons. if it is just a single or many bonded together, if all of them have the same number of protons, it is an element. in a piece of pure iron metal, all the are joined together, that piece of iron metal is called elemental iron. a single of iron is called elemental iron. a mixture has differences from place to place. we might need a microscope to see them or they might be obvious to the unaided eye. there are surfaces separating it into different phases. a mixture is the same everywhere. it is uniform. there are no surfaces separating it into different phases. if different kinds of atoms (different elements) are bonded together by their electrons, it is called a there are physical means of to isolate the different pure substances in a mixture and there are chemical means of to isolate the different elements in a compound. 1. element 2. compound 3. mixture 4. heterogeneous 5. homogeneous 6. pure substance 7. atoms 8. separation 9. viscosity 10. resistance

In which block of the periodic table is uranium (u) found? s blockd blockp blockf block