CHEM 103 LAB EXAM QUESTIONS AND
ANSWER WITH COMPLETE SOLUTIONS
100% CORRECT GRADED A+
Question: What are the visual results and clinical implications when Baeyer’s
test is performed on an Alkane?
Answer: ✔️✔️ The solution remains purple. Since alkanes lack the reactive
double bonds necessary to reduce the potassium permanganate reagent, this is
considered a negative reaction.
POSTIVE reaction
Bromine in CCl4 with Alkane -ANSWER ✔️✔️turns the red-orange
(NEGATIVE)
Bromine in CCl4 with Alkene -ANSWER ✔️✔️decolorizes (POSITIVE)
Density -ANSWER ✔️✔️Mass/ Volumes
Beer's law -ANSWER ✔️✔️A=ɛbc
A=Absorbance
Absorbance=2-log(%Transmittance)
ɛ= molar absorptivity
b= pathlength
c= concentration
What is curcumin -ANSWER ✔️✔️yellow compound present in turmeric
, What is used to extract yellow curcumin in Turmeric? -ANSWER ✔️✔️Isopropyl
alcohol
How is pH determined by using Curcumin? -ANSWER ✔️✔️Redish- BASE
Yellowish- addition of ACID
What is added to Tollen's test? -ANSWER ✔️✔️n-butyraldehyde
What happens when Tollen's test is performed on an aldehyde? -ANSWER
✔️✔️it REACTS and turns silver
What happens when Tollen's test is performed on a ketone? -ANSWER ✔️✔️NO
REACTION
Hydrozone derivatives formation with aldehyde -ANSWER
✔️✔️CRYSTALIZES
Hydrozone derivatives formation with a ketone -ANSWER ✔️✔️CRYSTALIZES
Aldehyde boiling points -ANSWER ✔️✔️LOWER than ketones (49-93 degrees
C)
Keton boiling points -ANSWER ✔️✔️HIGHER than aldehydes ( 94-173 degrees
C)
ASA SA ES Reactions -ANSWER ✔️✔️Hydrolysis:
Acetylsalicylic acid (ASA) → salicylic cycle (SA) + acetic acid
ANSWER WITH COMPLETE SOLUTIONS
100% CORRECT GRADED A+
Question: What are the visual results and clinical implications when Baeyer’s
test is performed on an Alkane?
Answer: ✔️✔️ The solution remains purple. Since alkanes lack the reactive
double bonds necessary to reduce the potassium permanganate reagent, this is
considered a negative reaction.
POSTIVE reaction
Bromine in CCl4 with Alkane -ANSWER ✔️✔️turns the red-orange
(NEGATIVE)
Bromine in CCl4 with Alkene -ANSWER ✔️✔️decolorizes (POSITIVE)
Density -ANSWER ✔️✔️Mass/ Volumes
Beer's law -ANSWER ✔️✔️A=ɛbc
A=Absorbance
Absorbance=2-log(%Transmittance)
ɛ= molar absorptivity
b= pathlength
c= concentration
What is curcumin -ANSWER ✔️✔️yellow compound present in turmeric
, What is used to extract yellow curcumin in Turmeric? -ANSWER ✔️✔️Isopropyl
alcohol
How is pH determined by using Curcumin? -ANSWER ✔️✔️Redish- BASE
Yellowish- addition of ACID
What is added to Tollen's test? -ANSWER ✔️✔️n-butyraldehyde
What happens when Tollen's test is performed on an aldehyde? -ANSWER
✔️✔️it REACTS and turns silver
What happens when Tollen's test is performed on a ketone? -ANSWER ✔️✔️NO
REACTION
Hydrozone derivatives formation with aldehyde -ANSWER
✔️✔️CRYSTALIZES
Hydrozone derivatives formation with a ketone -ANSWER ✔️✔️CRYSTALIZES
Aldehyde boiling points -ANSWER ✔️✔️LOWER than ketones (49-93 degrees
C)
Keton boiling points -ANSWER ✔️✔️HIGHER than aldehydes ( 94-173 degrees
C)
ASA SA ES Reactions -ANSWER ✔️✔️Hydrolysis:
Acetylsalicylic acid (ASA) → salicylic cycle (SA) + acetic acid
