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Worksheetspharmaceutics exam 1
Total questions: 59
Worksheet time: 31mins
the amount of iron determined today in your blood sample was found to be 100 mcg/deciliter such iron content in a blood sample can be categorized as
intensive
extensive
the 3rd law of thermodynamics deals with
entropy at absolute zero
thermal equilibrium
conservation of energy
enthalpy at absolute zero
the equilibrium constant of a reaction is related to the reaction temperature by
van't hoff equation
gibb's law
clausius-clapyeron equation
hess's law
second law of thermodynamics states that entropy of a system, undergoing spontaneous irreversible change, always increases
true
fasle
which law of thermodynamics is described as the law of conversion of energy
0 th
1 st
2 nd
3 rd
thermodynamics defines quantitative relationships between
heat and mechanical energy
heat and electrical energy
heat and chemical energy
adiabatic process can take place in
thermally insulated system
an isolated system
a vacuum flask
gibb's free energy equation should be used when a change in state is taking place at constant pressure
true
false
the equilibrium constant of a reaction is know as 25C is it possible to determine the equilibrium constant of that reaction at 45C
yes
no
depends on the enthalpy of the reaction
holmholtz's free energy equation should be used when a change in state is taking place at constant pressure
true
false
the heat absorbed by an isolated system at constant volume is used for
bringing about change in internal energy
bringing about change in internal energy and as well as for doing some useful work
applications of free energy functions are
calculations of equilibrium constants
hess law of constant heat summation
derivation of the vant hoff equation
the increase in heat content of a system is equal to
only heat absorbed by the system at constant temp
only heat released by the system at constant pressure
only heat absorbed by the system at constant volume
either heat absorbed or released by the system at constant pressure
if the work done by an isolated system is equal to the change in internal energy, then the energy gained or lost by the system is
zero
1 erg
1 cal
1 j
what would be the internal energy of a system which is absorbing heat adiabatically
increase
decrease
remain constant
the lowest possible entropy of a substance can be seen at
0 C
0 K
0 F
273.16 K
the concept of latent heat is valid only if the heat absorbed by a system is resulting into its change in phase
true
false
select the correct statement involving 2nd law of thermodynamics
the entropy change of reversible thermodynamic processes is always zero
the entropy change of reversible thermodynamic processes is always positive
the entropy change of reversible thermodynamic processes is sometimes zero
the entropy change of reversible thermodynamic processes is always negative
entropy of a system decresese with increase in randomness
true
false
an angstrom unit A is equal to
10^-10 m
10^-5 cm
10^-8 m
10^-1 cm
What would be the weight and mass of a 70 kg person in an elevator going down vertically at the acceleration
weight= 686.7 kg x m/s²; mass=70 kg
weight= 70 kg x m/s²; mass= 0 kg
weight= 686.7 kg x m/s²; mass= 0 kg
weight= 0 kg x m/s²; mass= 70 kg
Solving (567¹⁴)¹/⁷ is best stated as which of the following
antilog[(1/7) x 14 x log567]
antilog[(1/7) x 7 x log567]
log xy =
log x + y
log x + log y
log x X y
log X log y
A statement such as "not more than 110.0 percent" in the official compendium of the U.S. Pharmacopia and National Formulary may mean 110.1 or 110.2 percent.
true
false
the capillary rise method can be used to measure
surface tension
cohesive forces
adhesive forces
strength
the surface and core of the micelles formed in an aqueous medium are
hydrophilic and lipophilic
amphiphilic and hydrophilic
Lipophilic and amphiphilic
Lipophilic and hydrophilic
adsorption is a bulk phenomenon
true
false
in the case of liquid-gas interface, if the cohesive forces between liquid-liquid are equal to the adhesive forces of liquid-air , the surface tension would be
<0
>1
=1
=0
the dunouy tensiometer can be used to measure
both the surface and interfacial tension
Interfacial tension only
Surface tension only
Neither surface tension nor interfacial tension
physical adsorption occurs due to
Van der Waals attractive forces
Interfacial bonds
cohesive bonds
chemical bonds
The force required to detach the ring from the surface/interface, in the DuNouy ring method is recorded in
dynes
newtons
pounds
grams
You will use the surfactant having HLB values shown below to prepare an emulsion of olive oil in water
1-3
3-7
less than 9
9-15
Spans, sorbitans, esters have HLB values from
0-1
1.8-8.6
9-12
12-8
HLB scale can be used to measure the following activity of a surfactant
thermal activity
vibrational activity
surface activity
molecular activity
the higher the HLB value of an agent, the more lipophilic it is
true
false
When a capillary tube is placed in a liquid, the level of liquid in the capillary tube feel to a lower level than that of the liquid outside the tube. This is because
The adhesive forces between the liquid-glass and the cohesive forces between liquid-liquid are equal
The cohesive forces between the liquid-liquid are greater than the adhesive forces between liquid-glass
The adhesive forces between the liquid-glass are greater than the cohesive forces between liquid-liquid
The adhesive forces between the liquid-glass are lower than the cohesive forces between liquid-liquid
A molecule must be consisted of the following group(s) to possess surface activity
A hydrophilic (water-loving) group
A lipophilic (oil-loving) group
Paclitaxel is an anticancer drug which is solubilized by using a surfactant named:
tween 80
tween 20
span 80
Cremophor EL
The process by which a physically adsorbed gas is removed is called
evaporation
desorption
solubilization
sublimation
the attractive forces present between _____ are called adhesive forces
water-air
water-water
oil-oil
air-air
Activated charcoal is used as an antidote in drug poisoning because
the adsorption by activated charcoal prevents bioabsorption by the GI tract
the adsorption by activated charcoal causes elimination of drugs from the tissues into the GI tract by a process known as GI dialysis
which of the following cannot be observed
gas-gas
gas-liquid
liquid-gas
solid-solid
the temperature at which the vapor pressure of a liquid equals the external or the atmospheric pressure is called melting point
true
false
iodine dissolves in water in the presence of KI this is due to ion-induced dipole intercation
true
false
for real gases the collisions between particles is perfectly elastic
true
false
The critical temperature and pressure for CO2 are 31C and 74.9 atm, respectively. Can you liquefy CO2 stored at 100C by applying pressure?
yes
no
an unknown compound proceeds from the low melting metastable alpha form to the beta form having a higher melting point. however, in storage it was observed that the beta form reverted to the metastable alpha form. this kind of polymorphism is called monotropic
true
false
the intermolecular distance in solid is
less than that in both liquid and gas
higher than that in both liquid and gas
higher than liquid but less than gas
higher than gas but less than liquid
compound A was recrystallized from isopropyl alcohol to give a compound B, which had a rhombic cyrstalline appearance. the compound B showed a very high melting point compared to A. Compound B is
a polymorph of compound A
Is not a polymorph of compound A
a pseudopolymorph of compound A
none of the above
the temperature at which the vapor pressure of a liquid equals the external or the atmospheric pressure is known as
freezing point
boiling point
critical temperature
melting point
the forces that bind molecules include
repulsive and attractive forces
van der waals forces
ion-dipole and ion-induced dipole forces
hydrogen bonds
Clausius-Clapeyron equation for liquids establishes relationships between
vapor pressure and absolute temperature
freezing point and absolute temperature
vapor pressure and degrees celsius temerature
volume and absolute temperature
polymorphs are same substance but in different crystalline forms which are characterized by different
melting points
x-ray diffraction patterns
solubility
sodium chloride and methane are
covalent and covalent compound
electrovalent and covalent compound
electrovalent and electrovalent compound
covalent and electrovalent compound
a substance which is bound together by weak forces is said to have
low heat of fusion and low melting point
High heat of fusion and high melting point
High heat of fusion and low melting point
Low heat of fusion and high melting point
the high boiling point of water is due to hydrogen bonding
true
false
autoclave is an equipment used in hospitals for sterilization of surgical instruments. this has a pressure valve using which user-selectable pressure greater than atmospheric pressure can be applied. water boils inside an autoclave at
higher or lower than 100C
higher than 100C
lower than 100C
100C
in a pressure cooker, water boils at
100C
higher than 100C
lower than 100C
higher or lower than 100C
for a single component system, with 3 phases in equilibrium at the triple point, the degree of freedom is
0
3
1
