Thermodynamics Test

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Thermodynamics Test - 3

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Question 1
1 / -0

Calorimetry is an experimental technique or process of

A
measuring the maximum pressure developed in a reaction

B
measuring the amount of chemicals consumed

C
measuring the energy changes associated with chemical or physical processes.

D
measuring the amount of work done in a reaction

Solution

Calorimetry is an experimental technique or process of measuring the heat of chemical reactions or physical changes as well as heat capacity.
Question 2
1 / -0

An exothermic process

A
results in a decrease in the temperature of the system

B
results in a increase in the enthalpy of the system

C
results in a increase in the internal energy of the system

D
results in a decrease in the enthalpy of the system

Solution

Exothermic process results in decrease in enthalpy of system hence for exothermic reaction ΔH= -ve.
Question 3
1 / -0

Standard enthalpy of fusion or molar enthalpy of fusion is

A
The enthalpy change that accompanies melting of one mole of a solid substance in standard state.

B
The enthalpy change that accompanies vaporization of one kg of a solid substance in standard state

C
The enthalpy change that accompanies vaporization of one mole of a solid substance in standard state

D
The enthalpy change that accompanies melting of one kg of a solid substance in standard state

Solution

Molar enthalpy of fusion (always increases i.e. △△H= positive) is the amount of energy needed to change completely one mole of a substance from the solid phase to the liquid phase in standard state.
Question 4
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Standard Molar Enthalpy of Formation is

A
The standard enthalpy change for the formation of one mole of a compound from its elements in at a pressure of 10 bar and 30^∘ C.

B
The standard enthalpy change for the formation of one kg of a compound from its elements in their most stable states of aggregation.

C
The standard enthalpy change for the formation of one mole of a compound from its elements in their most stable states of aggregation.

D
The standard enthalpy change for the formation of one mole of a compound from its elements in at a pressure of 2 bar and 25^∘ C.

Solution

The standard enthalpy change for the formation of one mole of a compound from its elements in their most stable states of aggregation (reference states) is called standard molar enthalpy of formation.
Question 5
1 / -0

According to Hess’s Law, if a reaction takes place in several steps then its standard reaction enthalpy is

A
the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperature

B
the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 2 bar

C
the difference of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperature

D
the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 35^∘ C

Solution

Hess’s Law states that if a reaction takes place in several steps then its standard reaction enthalpy is the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperature.
Question 6
1 / -0

Enthalpy of atomization is enthalpy change on breaking

A
One mole of bonds completely to obtain atoms in the liquid phase

B
one kg of bonds completely to obtain atoms in the liquid phase

C
one mole of bonds completely to obtain atoms in the gas phase.

D
one kg of bonds completely to obtain atoms in the gas phase

Solution

Enthalpy of atomization is the enthalpy change that take place on breaking one mole of bonds completely of a compound or an element, to obtain atoms in the gas phase.
Question 7
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In the case of compounds such as CH₃CH₂Cl, CH₃NO₂ etc which of the following term is used as bond enthalpy.

A
Minimum bond enthalpy

B
Maximum bond enthalpy

C
Bond dissociation enthalpy

D
Mean bond enthalpy

Solution

For polyatomic molecules the term mean bond enthalpy is used for the enthalpy changes associated with chemical bonds.
Question 8
1 / -0

Enthalpy of solution of a substance is the enthalpy change

A
when one mole of it dissolves in a specified amount of solvent.

B
when one kg of it reacts with a specified amount of solvent.

C
when one kg of it dissolves in a specified amount of solvent.

D
when one mole of it reacts with a specified amount of solvent.

Solution

Enthalpy of solution of a substance is the enthalpy change when one mole of it dissolves in a specified amount of solvent.
Question 9
1 / -0

The lattice enthalpy of an ionic compound is the enthalpy change which occurs when

A
one mole of an ionic compound dissociates into its ions in gaseous state.

B
one mole of an ionic compound dissociates into its ions in liquid state.

C
one kg of an ionic compound dissociates into its ions in liquid state.

D
one gm of an ionic compound dissociates into its ions in gaseous state

Solution

The lattice enthalpy of an ionic compound is the enthalpy change which occurs, when one mole of an ionic compound dissociates into its ions in gaseous state.

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Thermodynamics Test - 3

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Thermodynamics Test - 3

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Question 1

measuring the maximum pressure developed in a reaction

measuring the amount of chemicals consumed

measuring the energy changes associated with chemical or physical processes.

measuring the amount of work done in a reaction

Solution

Question 2

results in a decrease in the temperature of the system

results in a increase in the enthalpy of the system

results in a increase in the internal energy of the system

results in a decrease in the enthalpy of the system

Solution

Question 3

The enthalpy change that accompanies melting of one mole of a solid substance in standard state.

The enthalpy change that accompanies vaporization of one kg of a solid substance in standard state

The enthalpy change that accompanies vaporization of one mole of a solid substance in standard state

The enthalpy change that accompanies melting of one kg of a solid substance in standard state

Solution

Question 4

The standard enthalpy change for the formation of one mole of a compound from its elements in at a pressure of 10 bar and 30∘ C.

The standard enthalpy change for the formation of one kg of a compound from its elements in their most stable states of aggregation.

The standard enthalpy change for the formation of one mole of a compound from its elements in their most stable states of aggregation.

The standard enthalpy change for the formation of one mole of a compound from its elements in at a pressure of 2 bar and 25∘ C.

Solution

Question 5

the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperature

the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 2 bar

the difference of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperature

the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 35∘ C

Solution

Question 6

One mole of bonds completely to obtain atoms in the liquid phase

one kg of bonds completely to obtain atoms in the liquid phase

one mole of bonds completely to obtain atoms in the gas phase.

one kg of bonds completely to obtain atoms in the gas phase

Solution

Question 7

Minimum bond enthalpy

Maximum bond enthalpy

Bond dissociation enthalpy

Mean bond enthalpy

Solution

Question 8

when one mole of it dissolves in a specified amount of solvent.

when one kg of it reacts with a specified amount of solvent.

when one kg of it dissolves in a specified amount of solvent.

when one mole of it reacts with a specified amount of solvent.

Solution

Question 9

one mole of an ionic compound dissociates into its ions in gaseous state.

one mole of an ionic compound dissociates into its ions in liquid state.

one kg of an ionic compound dissociates into its ions in liquid state.

one gm of an ionic compound dissociates into its ions in gaseous state

Solution

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The standard enthalpy change for the formation of one mole of a compound from its elements in at a pressure of 10 bar and 30^∘ C.

The standard enthalpy change for the formation of one mole of a compound from its elements in at a pressure of 2 bar and 25^∘ C.

the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 35^∘ C