Thermodynamics Test

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Thermodynamics Test - 1

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Question 1
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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 2 bar and 25°C.

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

C
The standard enthalpy change for the formation of one kg 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 10 bar and 30°C.

Solution

Explanation:

The standard enthalpy change for the formation of one mole of a compound from its elements in their most stable states of aggregation is enthalpy of formation.
Question 2
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Standard enthalpy of fusion or molar enthalpy of fusion is

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

B
the enthalpy change that accompanies melting 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 mole of a solid substance in standard state

Solution

Explanation:

The enthalpy change that accompanies melting of one mole of a solid substance in standard state is enthalpy of fusion.
Question 3
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An exothermic process

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

B
results in a increase in the enthalpy of the system

C
results in a decrease in the enthalpy of the system

D
results in a decrease in the temperature of the system

Solution

Explanation:

Exothermic process results in decrease in enthalpy of system because for exothermic reaction ΔH=-ve.
Question 4
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Calorimetry is a branch of science dealing with

A
measuring the amount of work done in a reaction

B
measuring the amount of chemicals consumed

C
measuring the maximum pressure developed in a reaction

D
measuring the amount of energy transferred as heat

Solution

Explanation:

Calorimetry is a branch of science dealing with measuring the amount of energy transferred as heat
Question 5
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The molar heat capacity of a substance is the

A
quantity of heat needed to raise the temperature of one kilogram by one degree Fahrenheit

B
quantity of heat needed to raise the temperature of one gram by one degree celsius

C
quantity of heat needed to raise the temperature of one mole by one degree celsius

D
quantity of heat needed to raise the temperature of one mole by one degree Fahrenheit

Solution

Explanation:

The molar heat capacity of a substance is the quantity of heat needed to raise the temperature of one mole by one degree Celsius.
Question 6
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According to first law of thermodynamics ΔU = q + w , where

A
q is negative if heat is transferred to the system and w is negative if work is done on the system

B
q is positive if heat is transferred to the system and w is positive if work is done on the system

C
q is positive if heat is transferred to the system and w is negative if work is done on the system

D
q is negative if heat is transferred to the system and w is positive if work is done on the system

Solution

Explanation:

In thermodynamics q=+ve when heat is supplied to the system. And w=+ve when work is done on the system while when work is done by the system w is taken as –ve.
Question 7
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first law of thermodynamics is a restatement of

A
law of conservation of parity

B
law of conservation of charge

C
law of conservation of mass

D
law of conservation of energy

Solution

Explanation:

It is restatement of law of conservation of energy.

It states that Thermodynamics isthe branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy.
Question 8
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in an open system,

A
the boundaries prevent the flow of matter out of it

B
the boundaries prevent the flow of matter into or out of it

C
the boundaries prevent the flow of matter into it

D
the boundaries permit the flow of matter into or out of it

Solution

Explanation:

In open system there is flow of matter amd energy in and out of the system.
Question 9
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in a closed system,

A
the boundaries prevent the flow of matter out of it

B
the boundaries prevent the flow of matter into or out of it

C
the boundaries permit the flow of matter into it

D
the boundaries permit the flow of matter into or out of it

Solution

Explanation:

in a closed system there is no flow of matter from one form to another.
Question 10
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Thermodynamics is the branch of physical science concerned with

A
Potential and its transformations to and from other forms of energy

B
kinetic energy and its transformations to and from other forms of energy

C
heat and its transformations to and from other forms of energy

D
mass and its transformations to and from other forms of energy

Solution

Explanation:

Thermodynamics deals with heat and its transformation from one form to another.

The branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy.

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Thermodynamics Test - 1

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Question 1

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 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 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 at a pressure of 10 bar and 30°C.

Solution

Question 2

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

the enthalpy change that accompanies melting 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 mole of a solid substance in standard state

Solution

Question 3

results in a increase in the internal energy of the system

results in a increase in the enthalpy of the system

results in a decrease in the enthalpy of the system

results in a decrease in the temperature of the system

Solution

Question 4

measuring the amount of work done in a reaction

measuring the amount of chemicals consumed

measuring the maximum pressure developed in a reaction

measuring the amount of energy transferred as heat

Solution

Question 5

quantity of heat needed to raise the temperature of one kilogram by one degree Fahrenheit

quantity of heat needed to raise the temperature of one gram by one degree celsius

quantity of heat needed to raise the temperature of one mole by one degree celsius

quantity of heat needed to raise the temperature of one mole by one degree Fahrenheit

Solution

Question 6

q is negative if heat is transferred to the system and w is negative if work is done on the system

q is positive if heat is transferred to the system and w is positive if work is done on the system

q is positive if heat is transferred to the system and w is negative if work is done on the system

q is negative if heat is transferred to the system and w is positive if work is done on the system

Solution

Question 7

law of conservation of parity

law of conservation of charge

law of conservation of mass

law of conservation of energy

Solution

Question 8

the boundaries prevent the flow of matter out of it

the boundaries prevent the flow of matter into or out of it

the boundaries prevent the flow of matter into it

the boundaries permit the flow of matter into or out of it

Solution

Question 9

the boundaries prevent the flow of matter out of it

the boundaries prevent the flow of matter into or out of it

the boundaries permit the flow of matter into it

the boundaries permit the flow of matter into or out of it

Solution

Question 10

Potential and its transformations to and from other forms of energy

kinetic energy and its transformations to and from other forms of energy

heat and its transformations to and from other forms of energy

mass and its transformations to and from other forms of energy

Solution

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