Lab Fina

Question 1

What were the physical properties used to identify alkanes and alkenes?

Answer 1

Boiling points and Density

Question 2

What color is the potassium permanganate reagent in the Baeyer’s test?

Answer 2

Purple

Question 3

What color is the bromine in the bromine test?

Answer 3

Yellowish/ Orange

Question 4

Which hydrocarbon will have positive result for the baeyer’s and/or bromine test?

Answer 4

Alkenes

Question 5

What solvent was used to extract curcumin?

Answer 5

Isopropyl alcohol

Question 6

What is the percent of curcumin found in turmeric?

Answer 6

3-5%

Question 7

What can curcumin be used as in the lab?

Answer 7

pH Indicator

Question 8

What instruments were used in this lab? Also know the parts.

Answer 8

Spec 20

Question 9

What is the maximum wavelength of curcumin in the UV/Vis sprectrum?

Answer 9

425

Question 10

What test was used to classify aldehydes and ketones?

Answer 10

Tollens

Question 11

Will a ketone or aldehyde react with the Tollen’s reagent?

Answer 11

Aldehyde will react but Ketone will not.

Question 12

What does a positive Tollen’s test look like?

Answer 12

Silver

Question 13

What physical state are the unknown ketone/aldehyde in?

Answer 13

Liquid

Question 14

What is the ketone/aldehyde derivative called?

Answer 14

2,4 dinitrophenylhydrazone

Question 15

What reagent was used to make the derivative?

Answer 15

2,4, dinitrophenylhydrazine

Question 16

What is the physical state of the derivative and color is it?

Answer 16

Solid and Yellow

Question 17

What compound was extracted out of the aspirin tablet? What solvent was used to extract it?

Answer 17

acetylsalicyclic acid, alcohol was solvent

Question 18

What was the acid used in the hydrolysis of acetylsalicyclic acid to salicyclic acid?

Answer 18

HCl which is diluted 20% to Muratic acid

Question 19

What temperature did this reaction performed at? (salicyclic acid) What is the byproduct of this reaction?

Answer 19

60 degree Celsius and acetic acid

Question 20

What acid catalyst was used in the esterification reaction (SA to ES)?

Answer 20

Boric acid

Question 21

What alcohol was used in the esterification of Salicylic Acid to produce the ester?

Answer 21

ethanol

Question 22

What is the ester produced in this lab (Salicyclic acid)? What is the odor of this ester?

Answer 22

ethyl salicyclate and wintergreen

Question 23

What is the reagent used to form a violet complex with salicyclic acid but not with acetylsalicyclic acid?

Answer 23

ferric ammonium sulfate

Question 24

What is the formula for Rf values?

Answer 24

Rf= (distance moved by the amino acid)/ (distance moved by solvent front)

Question 25

What was sprayed on the chromatograms to help identify the amino acids?

Answer 25

ninhydrin

Question 26

What is the first test used to determine the unknowns in the flow chart?

Answer 26

solubility of water

Question 27

What was the second test for solubility and what was positive for that test?

Answer 27

pH indicator and different pH ranges

Question 28

What was used to measure the pH?

Answer 28

Universal pH indicator

Question 29

What color is malachite?

Answer 29

bluish green

Question 30

What salt was used to make malachite?

Answer 30

Na2CO3 sodium carbonate

Question 31

What is malachite considered as in the paint? What is the egg considered as in paint?

Answer 31

Pigment and egg is the medium or suspension (binder)