PBE Flashcards
What functional groups are in dopamine?
catechol and amine
What is a buckyball?
A fullerene
Which of the following is the formula of buckyball?
C60
What is another name for lecithin?
Phosphatidylcholine
From which plant is capsaicin extracted?
Capsicum:
C18 H27 NO3
Which compound is formed by the reaction of malonic acid and urea with a catalyst as discovered by Adolf van Baeyer?
Barbituric acid
What structural characteristics do citric acid and malic acid have in common?
They are both hydroxy acids.
Determine which of the following will float or sink in water: balsa wood, ethylene glycol, table salt, ethanol.
Float, sink, sink, float
When a can of soda is opened and CO2 is released to the atmosphere. What is the resultant pH of the soda?
Increases
Which does not contain all C, N, H, and O?
Ascorbic Acid
At which temperature the speed of sound in hydrogen will be the same as that of speed of sound in oxygen at 100°C ?
23.2 K or -249.7 deg C
Who theorized stars collapsing into black hole as it increases in entropy?
Hawking
What compound if dehydrated forms water?
Propene
When traveling at NLEX at 80 mph a stopped car in front causes you to suddenly skid to stop. What happened to the kinetic energy of the moving car?
All of it was transferred to the road and surroundings.
What is the most oxidized form of nitrogen fixing bacteria?
Nitrate
How many different tetrapeptides can be made (a) if the peptides contain the residues of asparagine, proline, serine and methionine and (b) if all 20 amino acids can be used?
256 and 160,000
What are sigmatropic rearrangements in organic reactions?
They are different from electrolytic reactions wherein movement of a sigma bond with simultaneous rearrangement of pi-system does not occur.
How do two free radicals react when they encounter each other?
They unite with coal and bond formation.
What is the oxidation number of O in Na2SO4?
-2
How much is the amount of work done to move a 6.51 kilogram chair 7.841 M across the floor at constant velocity if the coefficient of kinetic friction between the chair and the floor is 0.651, and you are pushing at an angle at 15.41 degree relative to the floor?
354.2 J
Chemical formula of Caffeine
C18 H10 N4 O2
How to differentiate alkane, alkene, and alkyne?
reaction with Br2
Which of the following lipids contain a ceramide unit?
Sphingomyelins
Formula of alar
C6 H12 N2 O3
