PCP Flashcards
(22 cards)
Melamine is officially 1,3,5-triazine-2,4,6-triamine in the IUPAC nomenclature
system. It is used in the fire retardants in polymer resins because its high nitrogen
content released as flame stifling nitrogen gas when compound is burned or charred.
What is the chemical formula for the melamine?
a. C3H6N3
b. C3H6N4
c. C3H6N5
d. C3H6N6
d. C3H6N6
For the reaction 3A(g) + 3B(g) 2C(s) + 3D(g), the equilibrium concentration
are 0.3M A, 0.5M B, 0.2M C, 0.5M D. Find the equilibrium constant.
a. 37.04
b. 0.74
c. 12.3
d. 0.075
a. 37.04
The toxicity of waste in aquatic environment is measured using
a. Phytoxicity
b. Lethal dose concentration
c. Biotoxicity
d. BOD
b. Lethal dose concentration
A mixture of N2 and H2 was allowed to come to an equilibrium at a given
temperature. An analysis of the mixture at equilibrium contained 2 mol N2, 3 mol
H2 and 2.5 mol NH3. How many moles of H2 present at the beginning of the
reaction?
a. 3.5
b. 5.3
c. 7.5
d. 6.7
d. 6.7
Which f the following is a product on the hydrolization of ester?
a. Water
b. Acid
c. Alcohol
d. Base
b. Acid
A solution of 1.25g of a non-electrolyte solute in 20g of water freezes at 291.94K.
Find the molecular weight of the solute.
a. 110
b. 6.86
c. 180
d. 56.2
b. 6.86
How many additional chemicals were added last May 2009 to the original list of
POP’s prohibited by the Stockholm Convention?
a. 10
b. 9
c. 5
d. 12
b. 9
What mass in grams of NaC2H3O2 must be dissolved with 500ml of 0.100M acetic
acid to make 2L of buffer solution of pH 5? Ka=1.8x10-5
a. 2.28g
b. 7.19g
c. 7.38g
d. 2.12g
c. 7.38g
What is the pH of the resulting solution made by making 5ml of 0.2178M HCl and
15ml of 0.1156M NH3? KNH3=1.8x10-5
a. 9.49
b. 9.90
c. 9.02
d. 12.74
c. 9.02
Baker’s yeast is to be grown in a continuous fermentation system using a fermenter
volume of 20m3 in which the flow residence time is 16h. A 2% inoculum
containing 1.2% of yeast cells is included in the growth medium. This is then passed
to the fermenter in which the yeast grows with a steady doubling time of 2.9h. The
broth leaving the fermenter then passes to a continuous centrifuge which produces
a yeast cream containing 7% yeast, 97% of the total yeast in the broth. Calculate
the rate of flow of the yeast cream.
a. 1235 kg/hr
b. 2639 kg/hr
c. 1114 kg/hr
d. 315.67 kg/hr
a. 1235 kg/hr
He proposed the theory of electrolytic dissociation
a. Debye and Huckel
b. Arrhenius
c. Faraday
d. Kohlrausch
b. Arrhenius
Calculate the molarity of NaOH solution if 18.25 ml was used to titrate 0.4815 gram
of primary standard KHP.
a. 0.18
b. 0.13
c. 0.26
d. 0.16
b. 0.13
What is the pH of a 0.068 M aqueous solution of sodium cyanide? Ka for
HCN=4.9x10-10
a. 0.74
b. 2.93
c. 11.07
d. 13.26
c. 11.07
Calculate the pH of a solution made by dissolving 1.87g of sodium caproate
(NaC6H11O2) in water and diluting to a total volume of 500 ml. For the caproate
ion, Kb-7.58x10-10
a. 5.344
b. 5.494
c. 8.505
d. 8.656
d. 8.656
The root mean square speed of CO at 113C is _____ m/s.
a. 317
b. 58.3
c. 586
d. 993
c. 586
Which of the following is a Huckel number?
a. 8
b. 10
c. 12
d. 16
b. 10
Determine the fraction of ionization of HX (a weak electrolyte) if a solution
prepared by dissolving 0.020 moles of HX in 115g water freezes at -0.74 degC.
a. 0.044
b. 0.30
c. 0.45
d. 1.45
c. 0.45
What is the IUPAC name for the molecule having a methyl group attached to an 8-
carbon alkane ring?
a. Cyclooctanol
b. Methylcyclooctane
c. Cyclooctane
d. Boric acid
b. Methylcyclooctane
Which of the following best explains the relative stabilities of the eclipsed and
staggered forms of ethane? The ____ form has the most _____ strain.
a. Eclipsed; steric
b. Eclipsed; torsional
c. Staggered; steric
d. Staggered; torsional
b. Eclipsed; torsional
Which of the following is the strongest interaction?
a. A covalent bond
b. Induced dipole-induced dipole interactions
c. Dipole-dipole interactions
d. Hydrogen bonding
e. Van der waals
a. A covalent bond
A sample containing Na2CO3, NaOH and inert matter weighs 1.179g. It is titrated
with 0.2239M HCl with phenolphthalein as the indicator, and the solution became
colorless after the addition of 46.25 ml. Methyl orange is then added and 12.85 ml
more of the acid is needed for the color change. What is the percentage of Na2CO3
in the sample?
a. 24.89%
b. 64.95%
c. 76.12%
d. 25.87%
d. 25.87%
Histamine, an organic nitrogenous compound which can cause allergic rhinitis can
be produced in our body through the decarboxylation of the amino acid histamine.
Given that 18mM of the decarboxylase is used and 5mM of histidine forms.
Calculate the Michaelis-Menten constant if the reaction velocity and the TON are
6mM/s and 37/s respectively.
a. 0.330 M
b. 0.440 M
c. 0.550 M
d. 0.660 M
c. 0.550 M
