OAT prep questions with complete
answers A+ rated
Conduction - correct answer ✔✔direct transfer of energy from molecule to
molecule via direct molecular collisions
What are the best and worst conductors? - correct answer ✔✔Worst= gases
Best= metals
Convection - correct answer ✔✔heat transfer by physical motion; only takes place
in fluids and gases. Heat energy is transferred AWAY from the source.
Radiation - correct answer ✔✔transfer of energy by electromagnetic waves.
Radiation can travel through a hard vacuum.
Ex: energy from sun
specific heat - correct answer ✔✔c, amount of heat energy needed to raise the
temperature of 1kg by on degree K.
What is the specific heat of water? - correct answer ✔✔4186 J/kg*K
Heat transfer formula - correct answer ✔✔Q=mc(Tf-Ti)
Heat of transformation from solid to liquid - correct answer ✔✔heat of fusion
,Heat of transformation from liquid to gas - correct answer ✔✔heat of
vaporization
Temperature Definition - correct answer ✔✔average kinetic energy of the system
Pressure definition - correct answer ✔✔Force per unit surface area (F/A)
STP Conditions - correct answer ✔✔273 K
1 atm
1 mole gas --> 22.4 L
Ideal Gas law - correct answer ✔✔PV=nRT
n= 8.31 J/K*mol
Internal Energy of Monoatomic ideal gas - correct answer ✔✔U = (3/2)nR(Tf-Ti)
*if temperature stays constant, the internal energy stays constant*
How does Q change when heat is added or removed from a system? - correct
answer ✔✔Heat added: Q>0
Heat removed: Q<0
When is work positive? - correct answer ✔✔When work is done by the gas (when
the gas loses energy)
,When is work negative? - correct answer ✔✔When work is done on the gas
(when the gas gains energy)
First law of thermodynamics - correct answer ✔✔Change in Internal Energy (U) =
Q-W
Work in thermodynamic process - correct answer ✔✔work done by a sample of
gas is equal to the area enclosed by its P-V curve
When the volume of a sample of gas decreases, what is the resulting work? -
correct answer ✔✔Work is done on the gas, therefore the work will be negative
Cyclic processes (Pressure and Volume) - correct answer ✔✔total work done by
the gas is area enclosed
Final Internal energy = Initial internal energy
Isothermal process - correct answer ✔✔temperature remains constant
As pressure of gas increases, the volume decreases (and vice-versa)
*if ideal gas, then Q = W
Isobaric process - correct answer ✔✔Pressure remains constant
As volume increases, temperature increases
W=P(Vf-Vi)
, Isovolumetric process - correct answer ✔✔volume stays constant
Work = 0
U=Q
Adiabatic expansion/compression - correct answer ✔✔No heat transfer into/out
of the system
Q=0
U = -W
irreversible process - correct answer ✔✔all real processes; proceed in definite
time order
Ex: dropping a glass onto the floor and it shatters into many pieces, this can't be
undone
reversible process - correct answer ✔✔system can run initial to final state or final
state to initial state along the same path
Entropy Definition - correct answer ✔✔degree of disorder of a system
Second Law of thermodynamics - correct answer ✔✔any thermodynamic process
that moves from one equilibrium state to another, the entropy of the system and
its surrounding environment together will either increase or remain unchanged.
Reaction Rate - correct answer ✔✔= change in concentration/time for change to
occur
answers A+ rated
Conduction - correct answer ✔✔direct transfer of energy from molecule to
molecule via direct molecular collisions
What are the best and worst conductors? - correct answer ✔✔Worst= gases
Best= metals
Convection - correct answer ✔✔heat transfer by physical motion; only takes place
in fluids and gases. Heat energy is transferred AWAY from the source.
Radiation - correct answer ✔✔transfer of energy by electromagnetic waves.
Radiation can travel through a hard vacuum.
Ex: energy from sun
specific heat - correct answer ✔✔c, amount of heat energy needed to raise the
temperature of 1kg by on degree K.
What is the specific heat of water? - correct answer ✔✔4186 J/kg*K
Heat transfer formula - correct answer ✔✔Q=mc(Tf-Ti)
Heat of transformation from solid to liquid - correct answer ✔✔heat of fusion
,Heat of transformation from liquid to gas - correct answer ✔✔heat of
vaporization
Temperature Definition - correct answer ✔✔average kinetic energy of the system
Pressure definition - correct answer ✔✔Force per unit surface area (F/A)
STP Conditions - correct answer ✔✔273 K
1 atm
1 mole gas --> 22.4 L
Ideal Gas law - correct answer ✔✔PV=nRT
n= 8.31 J/K*mol
Internal Energy of Monoatomic ideal gas - correct answer ✔✔U = (3/2)nR(Tf-Ti)
*if temperature stays constant, the internal energy stays constant*
How does Q change when heat is added or removed from a system? - correct
answer ✔✔Heat added: Q>0
Heat removed: Q<0
When is work positive? - correct answer ✔✔When work is done by the gas (when
the gas loses energy)
,When is work negative? - correct answer ✔✔When work is done on the gas
(when the gas gains energy)
First law of thermodynamics - correct answer ✔✔Change in Internal Energy (U) =
Q-W
Work in thermodynamic process - correct answer ✔✔work done by a sample of
gas is equal to the area enclosed by its P-V curve
When the volume of a sample of gas decreases, what is the resulting work? -
correct answer ✔✔Work is done on the gas, therefore the work will be negative
Cyclic processes (Pressure and Volume) - correct answer ✔✔total work done by
the gas is area enclosed
Final Internal energy = Initial internal energy
Isothermal process - correct answer ✔✔temperature remains constant
As pressure of gas increases, the volume decreases (and vice-versa)
*if ideal gas, then Q = W
Isobaric process - correct answer ✔✔Pressure remains constant
As volume increases, temperature increases
W=P(Vf-Vi)
, Isovolumetric process - correct answer ✔✔volume stays constant
Work = 0
U=Q
Adiabatic expansion/compression - correct answer ✔✔No heat transfer into/out
of the system
Q=0
U = -W
irreversible process - correct answer ✔✔all real processes; proceed in definite
time order
Ex: dropping a glass onto the floor and it shatters into many pieces, this can't be
undone
reversible process - correct answer ✔✔system can run initial to final state or final
state to initial state along the same path
Entropy Definition - correct answer ✔✔degree of disorder of a system
Second Law of thermodynamics - correct answer ✔✔any thermodynamic process
that moves from one equilibrium state to another, the entropy of the system and
its surrounding environment together will either increase or remain unchanged.
Reaction Rate - correct answer ✔✔= change in concentration/time for change to
occur
