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WorksheetsChemical thermodynamics
Total questions: 20
Worksheet time: 10mins
A system which exchanges both matter and energy is called --- system
(a)
Temperature is ----- property
Intensive property
Extensive property
In an isothermal process
Delta U=0
Q=0
T=0
none of these
Mathematical equation of first law of thermodynamics is
Here U means delta U
U=q+W
q=U+W
W=U+q
None of these
Enthalpy H =
U-PV
U+PV
PV
PV-U
Delta S >0 then reaction
Non spontaneous
Spontaneous
At equilibrium
None of these
Which of the following is true for a closed system?
mass entering = mass leaving
mass does not enter or leave the system
mass entering can be more or less than the mass leaving
none of the mentioned
Thermodynamics is not concerned about
Energy changes involved in a chemical reaction.
The extent to which a chemical reaction proceeds
The rate at which a reaction proceeds.
The feasibility of a chemical reaction.
Which of the following statements is correct?
The presence of reacting species in a covered beaker is an example of open system.
There is an exchange of energy as well as matter between the system and the surroundings in a closed system.
The presence of reactants in a closed vessel made up of copper is an example of a closed system.
The presence of reactants in a thermos flask or any other closed insulated vessel is an example of a closed system.
The state of a gas can be described by quoting the relationship between
pressure, volume, temperature
temperature, amount, pressure
amount, volume, temperature
pressure, volume, temperature, amount
Which of the following variables controls the physical properties of a perfect gas
pressure
temperature
volume
all of the above
Intensive property of a system is one whose value
depends on the mass of the system, like volume
does not depend on the mass of the system, like temperature, pressure, etc.
is not dependent on the path followed but on the state
is dependent on the path followed and not on the state
Work done in a free expansion process is
+ ve
-ve
zero
maximum
An isolated system is one in which
mass does not cross boundaries of the system, though energy may do so
neither mass nor energy crosses the boundaries of the system
both energy and mass cross the boundaries of the system
mass crosses the boundary but not the energy
In a free expansion process
(a) work done is zero
(b) heat transfer is zero
(c) both (a) and (b) above
(d) work done is zero but heat increases
First law of thermodynamics furnishes the relationship between
heat and work
heat, work and properties of the system
heat and internal energy.
various properties of the system
Standard enthalpy change of combustion is defined as the enthalpy change when
1 mole of compound is burnt in oxygen.
1 mole of compound is completely burnt in oxygen under standard conditions of 298K and 1 bar.
1 mole of compound is burnt under oxygen at 293K and 1 bar.
1 mole of oxygen is used to burn a compound under standard conditions of 298K and 1 bar.
Two objects with different temperatures are placed into a system. Which way will heat flow naturally?
From the warmer object to the cooler object.
From the cooler object to the warmer object.
From one object to the other regardless of temperature.
No flow will occur.
What must occur for the natural flow of heat to be reversed?
Work
Kinetic Energy
Temperature Conversion
Create energy
What is specific heat at constant pressure, Cp?
The energy required to raise the temperature of the unit mass of a substance by one degree as the pressure is maintained constant.
The energy required to decrease the temperature of the unit mass of a substance by one degree as the pressure change.
The energy required to decrease the temperature of the unit mass of a substance by one degree as the pressure is maintained constant.
The energy required to raise the temperature of the unit mass of a substance by one degree as the pressure is change.
