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Department of Chemistry School of Plysical Sciences College of Agriculture and Natural Sciences CHE 399 Researci. Methods QUIZ 1 1. Mention the appropriate method you would use to extract/separate/purify each of the following mixtures [4] a. Neem oil and water b. Food dye c. Alkaloid from Jatropha plant d. Ethanol from palm wine 2. A sample was placed on a chromatography column. Dichloromethane/ethyl acetate (7:3) was used as the eluting solvent system. No separation of the components in the sample was observed. a) What must have been happening during this experiment? [2] b) What would you do to overcome this problem? \( \qquad \) [2] 3. In each of the following situations, what type of filtration would you use?[4] a) Remove powdered decolorizing charcoal from 20 mL solution b) Collect crystals obtained from crystallizing a substance from a solution. 4. State two (2) differences between evaporation and crystallization [2] 5. Consider the following solvent pairs. If mixed, which pairs would form two layers? If they form two layers, which solvent would be on top? [6] a) hexanes and water \[ \cos ^{+t} \] b) water and methylene chloride c) hexanes and methylene chloride d) methanol and hexanes e) ethanol and water f) acetone and toluene wor me

          Department of Chemistry
School of Plysical Sciences
College of Agriculture and Natural Sciences
CHE 399 Researci. Methods
QUIZ 1
1. Mention the appropriate method you would use to extract/separate/purify each of the following mixtures [4]
a. Neem oil and water
b. Food dye
c. Alkaloid from Jatropha plant
d. Ethanol from palm wine
2. A sample was placed on a chromatography column. Dichloromethane/ethyl acetate (7:3) was used as the eluting solvent system. No separation of the components in the sample was observed.
a) What must have been happening during this experiment? [2]
b) What would you do to overcome this problem? \( \qquad \)
[2]
3. In each of the following situations, what type of filtration would you use?[4]
a) Remove powdered decolorizing charcoal from 20 mL solution
b) Collect crystals obtained from crystallizing a substance from a solution.
4. State two (2) differences between evaporation and crystallization
[2]
5. Consider the following solvent pairs. If mixed, which pairs would form two layers? If they form two layers, which solvent would be on top?
[6]
a) hexanes and water
\[
\cos ^{+t}
\]
b) water and methylene chloride
c) hexanes and methylene chloride
d) methanol and hexanes
e) ethanol and water
f) acetone and toluene
wor me

Department of Chemistry
School of Plysical Sciences
College of Agriculture and Natural Sciences
CHE 399 Researci. Methods
QUIZ 1
1. Mention the appropriate method you would use to extract/separate/purify each of the following mixtures [4]
a. Neem oil and water
b. Food dye
c. Alkaloid from Jatropha plant
d. Ethanol from palm wine
2. A sample was placed on a chromatography column. Dichloromethane/ethyl acetate (7:3) was used as the eluting solvent system. No separation of the components in the sample was observed.
a) What must have been happening during this experiment? [2]
b) What would you do to overcome this problem?
[2]
3. In each of the following situations, what type of filtration would you use?[4]
a) Remove powdered decolorizing charcoal from 20 mL solution
b) Collect crystals obtained from crystallizing a substance from a solution.
4. State two (2) differences between evaporation and crystallization
[2]
5. Consider the following solvent pairs. If mixed, which pairs would form two layers? If they form two layers, which solvent would be on top?
[6]
a) hexanes and water

cos ^+t

b) water and methylene chloride
c) hexanes and methylene chloride
d) methanol and hexanes
e) ethanol and water
f) acetone and toluene
wor me

Added by Karen F.

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