# Thermodynamics: Study of the Relations Between Heat, Work, Temperature, and Energy

In this quiz, you will find questions related to thermodynamics i.e, entropy, heat, work, temperature, and energy.

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In an adiabatic process the work done is 50 KJ, what is its internal energy?

50 KJ 25 KJ -50 KJ -25 KJ

An adiabatic process pressure is related to volume as _________

PV = constant PVγ constant PV3 constant PV2 constant

What will be the value of ΔH, if the forward and reverse reactions have the same energy of activation?

ΔH = ΔG = ΔS = 0 ΔS = 0 ΔG = 0 ΔH = 0

What is the molar entropy change for melting of ice at 0℃, if ΔHf = 1.435 kcal/mol?

0.526 cal/(mol K) 5.26 cal/(mol K) 10.52 cal/(mol K) 21.04 cal/(mol K)

Which is true for the entropy of a spontaneous reaction?

ΔS(system) – ΔS(surroundings) > 0 ΔS(system) + ΔS(surroundings) > 0 ΔS(surroundings) > 0 only ΔS(system) > 0 only

One mole of which of the following has the highest entropy?

Liquid Nitrogen Hydrogen Gas Mercury Diamond

The enthalpy of vaporisation of a substance is 8400 J mol-1 and its boiling point is –173°C. The entropy change for vaporisation is :

84 J mol-1K-1 21 J mol-1K-1 49 J mol-1K-1 12 J mol-1K-1

The species which by definition has ZERO standard molar enthalpy of formation at 298 K is

Br2(g) Cl2(g) H2O(g) CH4(g)

In a reversible process the system absorbs 600 kJ heat and performs 250 kJ work on the surroundings. What is the increase in the internal energy of the system?

850 kJ 600 kJ 350 kJ 250 kJ

Which of the following is true for the reaction? H2O (l) ↔ H2O (g) at 100° C and 1 atm pressure

∆S = 0 ∆H = T ∆S ∆H = ∆U ∆H = 0

Which of the following property cannot be used to describe the state of a system?

Pressure

Volume

Temperature

Universal gas constant

When work is done on system or by a system there is a change in _________

External energy

Internal energy

Isothermal energy

The system that does not allow the heat to pass through its boundary between the system and surroundings is called as ______________ system.

Open

Isothermal

Close

What is the function of a catalyst in a chemical reaction?

Decrease rate constant of reaction

Increases activation energy of reaction

Reduces enthalpy of reaction

Does not affect the equilibrium constant of reaction

What will be the work done by 3 moles of an ideal gas when it expands spontaneously in a vacuum?

Zero

Infinite

3 joules

9 joules

Which of the following statements is not true regarding the laws of thermodynamics ?

It deal with energy changes of microscopic systems It does not depends on the rate at which these energy transformations are carried out. It depends on initial and final states of a system undergoing the change. It deal with energy changes of macroscopic systems

Which of the following is closed system ?

Pressure cooker Rocket engine during propulsion Tea placed in a steel kettle Jet engine

An isolated system is that system in which

There is no exchange of mass or energy with the surroundings There is exchange of mass with the surroundings There is exchange of mass and energy with the surroundings There is no exchange of energy with the surroundings

The rate at which a reaction proceeds

The feasibility of a chemical reaction

The extent to which a chemical reaction proceeds

Energy changes involved in a chemical reaction

The universe refers to

Both system and surroundings

None of these

Only surroundings

Only system

Quiz/Test Summary
Title: Thermodynamics: Study of the Relations Between Heat, Work, Temperature, and Energy
Questions: 20
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