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Chemical Thermodynamics - SS2 Chemistry Past Questions and Answers - page 1

1

Which of the following statements is true according to the First Law of Thermodynamics?

 

A

Energy can be created or destroyed.

 

B

The total energy of a closed system remains constant.

 

C

Energy flows spontaneously from a cooler object to a hotter object.

 

D

The entropy of a system always increases.

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2

The Second Law of Thermodynamics states that:

 

A

Energy is conserved in all physical and chemical processes.

 

B

Heat always flows from a higher temperature object to a lower temperature object.

 

C

The entropy of a system approaches zero as its temperature approaches absolute zero.

 

D

It is impossible to construct a device that operates in a cycle and extracts heat from a single reservoir to produce work.

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3

The Third Law of Thermodynamics states that:

 

A

Energy is conserved in all physical and chemical processes.

 

B

The entropy of a pure crystalline substance is zero at absolute zero temperature.

 

C

The total energy of a closed system remains constant.

 

D

The entropy of a system always increases.

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4

The change in internal energy (ΔU) of a system is given by:

 

A

ΔU = q - w

 

B

ΔU = q + w

 

C

ΔU = q/T

 

D

ΔU = -q - w

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5

The equation ΔS = qrev/T relates which of the following quantities?

 

A

Change in internal energy and temperature

 

B

Change in entropy and heat transfer

 

C

Change in entropy and work done

 

D

Change in temperature and heat transfer

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6

Discuss two laws of thermodynamics. Explain the concepts and implications of both laws, and provide examples illustrating their application.

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7

Which of the following statements best describes enthalpy?

 

A

It represents the disorder or randomness of a system.

 

B

It measures the heat content of a system at constant pressure.

 

C

It determines the direction of a spontaneous reaction.

 

D

It quantifies the free energy change of a reaction.

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8

The standard enthalpy change of a reaction is defined as:

 

A

The change in enthalpy of the reaction when reactants are in their standard states.

 

B

The enthalpy change of a reaction that occurs at standard temperature and pressure.

 

C

The difference in enthalpy between products and reactants of a reaction.

 

D

The enthalpy change of a reaction when one mole of a compound is formed from its elements in their standard states.

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9

Which of the following is an example of an exothermic process?

 

A

Melting of ice cubes at room temperature.

 

B

Dissolution of an ionic compound in water.

 

C

Evaporation of water.

 

D

Boiling of water

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10

Entropy is a measure of:

 

A

The heat content of a system.

 

B

The disorder or randomness of a system.

 

C

The enthalpy change of a reaction.

 

D

The free energy change of a reaction.

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