Ans : ΔH is the same because it is a state function but q will be different for different paths. 7. Thermodynamics article. Q-10 State whether the following processes will increase or decrease the total energy content of the system : Ans : (i) When heat is transferred from the system to the surroundings , the internal energy of the system is decreased . But ∆U = 0 After the equilibrium is reached, the pressure on the piston is lowered so that the gas expands at constant temperature. Edit. a. The First Law of Thermodynamics Work and heat are two ways of transfering energy between a system and the environment, causing the system’s energy to change. Comprehending as … Thermodynamics Conceptual DRAFT. (ii)The relation between the free energy change , enthalpy change and entropy change is given by the expression ΔG = ΔH -T ΔS . Isothermal processes must be slow to make sure that as heat is transferred, the temperature does not change. Consequently . Q-7 Mention the most important condition for a process to be reversible in thermodynamics . 14 lessons • 2 h 13 m . $$\displaystyle p(V−b)=−c_T$$ is the temperature scale desired and mirrors the ideal gas if under constant volume. 1991 Subaru Legacy Check Engine Light Sebvan De. The same conclusion is obtained from Hess’s Law which states that change in heat energy remains the same during a process. Q-17 An exothermic reaction A → B is spontaneous in the backward direction . Still have questions? a nuclear power plant, a refrigerator, a jet engine). (A) First Law of Thermodynamics (B) Second Law of Thermodynamics (C) Mechanical equivalent of heat (D) Zeroth Law of Thermodynamics (E) Thermal expansion of solids 2. b. Conceptual problems are often formulated as multiple-choice questions, making them easy to use during in-class discussions, particularly when utilizing active learning, peer instruction, and audience response. Q-6 Classify the following into extensive or intensive property : Ans : (i) entropy (ii) mass (iii) volume and ( viii) free energy – are extensive properties. At a temperature of absolute zero, all motion within a system ceases. If the magnitude of T ΔS becomes greater than that of ΔH . 1 mole of CaCO3 (s) is produced from CaO (s) and CO2(g) and not from the constituent elements i.e. Thermodynamics Conceptual Question (bEst answer rewarded!)? Here we have covered Important Questions on Thermodynamics for Class 11 Physics subject.. Physics Important Questions Class 11 are given below.. Question based on 1st Law of Thermodynamics and SFEE. Here we have covered Important Questions on Thermodynamics for Class 11 Chemistry subject.. Chemistry Important Questions Class 11 are given below.. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Conceptual problems are often formulated as multiple-choice questions, making them easy to use during in-class discussions, particularly when utilizing active learning, peer instruction, and audience response. Finally, the gas is heated isochorically to return to the initial state (step 4). Start studying Thermodynamics Conceptual Questions. Table of contents. Under constant volume, all heat goes into internal energy. Ca , C and O2 directly , on this basis . Q-13 Which of the following processes are accompanied by increase of entropy ? 73. Watch Queue Queue Engineering Thermodynamics MCQ question is the important chapter for a Mechanical Engineering and GATE students. Questions: Describe the energy exchange processes in _____ (fill in the blank, e.g. Fundamentals Of Thermodynamics Richard E Sonntag Claus. Your email address will not be published. What is Gibbs -Helmholtz equation ? Ans : Temperature inside the tyre increases because the work done on the system gets converted into heat . 47. A metal rod is placed so that it connects a heat source at 100°C and a heat sink at 10°C. What does free energy signify ? Expected Questions series Thermodynamics Part-1. Chemistry being my favourite subject has always been a stronghold for me. Save. Describe the photo of the tea kettle at the beginning of this section in terms of heat transfer, work done, Skip to Content. 0 0. vicini. Shortcut tricks will be explained wherever is required. Q-33 Predict the signs of ΔH and ΔS for the reaction. 0 0. vicini. $$\displaystyle ΔE_{AB}=3600J,ΔE_{BC}=374J$$; e. No, because heat was added for both parts AD and DC. This course will cover previous year Questions of XE and other questions from the standard book which is very relevant to GATE ME Questions. This is because of the fact that the opposing force in a reversible process is infinitesimally smaller than the driving force . No work is done and they reach the same common temperature. $$\displaystyle W=4.39kJ,ΔE_{int}=−4.39kJ$$, 67. pressure decreased by 0.31 times the original pressure. 0 0. Q-2 Neither q nor W … The Following Section consists of Thermodynamics Questions on Physics. When a gas system is expanded in vacuum , no work is done by the gas system as the external pressure is zero ( vacuum) hence W=0, When an ideal gas expanded reversibly and isothermally , the work done by the gas system becomes maximum . Lecture. It is the enthalpy of reaction of CaCO3. Homework. Example Question #1 : Thermodynamics. 4 years ago. Best Thermodynamics Objective type Questions and Answers. Thus there will be an increase in entropy . So that the process is represented by the curve $$\displaystyle p=nRT/V$$ on the pV plot for the evaluation of work. ΔS is -ve because there is less randomness among the molecules than among the atoms . Q-16 Why does the negative value of ΔH means an exothermic reaction while a positive value of ΔH means an endothermic reaction ? Conceptual Questions. 3.A: The First Law of Thermodynamics (Answer), [ "article:topic", "authorname:openstax", "license:ccby", "showtoc:no", "program:openstax" ], 3.7: Adiabatic Processes for an Ideal Gas, 3.E: The First Law of Thermodynamics (Exercise), Creative Commons Attribution License (by 4.0). Conceptual Questions On Thermodynamics . This Is From Fundamentals Of Engineering Thermodyn. 3. Question3: Explain the following terms: Isolated system, Open system and closed system and give example where ever possible.? Give its limitations and importance.? Inlet mass and outlet mass could be something reckoning on the source and receiver. When water freezes or when ice melts while removing or adding heat, respectively, the temperature remains constant. $$\displaystyle \frac{3}{2}(p_2V_2−p_1V_1)$$; c. the sum of parts (a) and (b); d. $$\displaystyle T_1=\frac{p_1V_1}{nR}$$ and $$\displaystyle T_2=\frac{p_2V_2}{nR}$$, b. first law of thermodynamics conceptual questions; first law of thermodynamics conceptual questions. First law of thermodynamics. Q-5 Energy of the universe is decreasing due to daily consumption of energy :– state True or False . SE; b. ES; c. ES. 1. a. Ans : In gaseous state the entropy of a system becomes maximum as in this state its molecules have greater space and greater freedom of motion . Some possible solutions are frictionless movement; restrained compression or expansion; energy transfer as heat due to infinitesimal temperature nonuniformity; electric current flow through a zero resistance; restrained chemical reaction; and mixing of two samples of the same substance at the same state. 5. 0. In this state the two bodies will be at the same temperature. Standard Gibbs energy of formation of NO(g) is 86.7 kJ/mol. Ans : Energy of the universe neither decrease nor increase . Chemistry: The Molecular Science (5th Edition) answers to Chapter 16 - Thermodynamics: Directionality of Chemical Reactions - Questions for Review and Thought - Topical Questions - Page 737d 67a including work step by step written by community members like you. Table of contents. ΔH <0 ( -ve) , ΔS >0 ( + ve) . Played 0 times. But the natural reference state for the entropy is taken as absolute zero i.e. Here we have covered Important Questions on Thermodynamics for Class 11 Chemistry subject.. Chemistry Important Questions Class 11 are given below.. Required fields are marked *. B S Lecture. Q-2 Neither q nor W is a state function but q+W is a state function – why ? Edit. Hr < Hp . Isothermal has a greater final pressure and does not depend on the type of gas. The Following Section consists of Thermodynamics Questions on Physics. 00:32. Multiple Choice Questions (MCQ) and Answers on Chemical Engineering Thermodynamics Question 1 : The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. Q-23 . Overview of the course. 5. Note, however, that a quasi-static process is not necessarily reversible, since there may be dissipative forces involved. Missed the LibreFest? Preface; 1 Introduction: The Nature of Science and Physics. This work is licensed by OpenStax University Physics under a Creative Commons Attribution License (by 4.0). Such a process must therefore also be quasi-static. Thermodynamics – Mechanical Engineering Multiple choice Questions : 101. 7. Preface; 1 Introduction: The Nature of Science and Physics. (ii) When work is done by the system adiabatically , this work is done at the cost of internal energy of the system . The system must be in contact with a heat source that allows heat to flow into the system. 11. Chemistry. Conceptual Questions. 1. Save. Conceptual questions of Thermodynamics PART 1 1. But as the backward reaction is spontaneous in this case , the randomness factor must favour the backward reaction i.e. Thermodynamics Concepts and Tricky Question Series: GATE Mechanical. Department Of Chemical Engineering Auburn University. Watch Queue Queue. Q-32 A system is changed from an initial state to a final state by a process such that ΔH =q .If the change from initial state to the final state were measured by a different path , would ΔH and q be the same as that for the first path ? Ans : It is given that the forward reaction is exothermic , consequently the backward reaction will be endothermic , so the energy factor acts against the backward reaction. therefore , the reaction is non-spontaneous under the standard conditions and hence N2 and O2 do not combine . This Course is beneficial for GATE (Mechanical) and GATE XE aspirants. Q-25 What is the basic difference between enthalpy of formation and enthalpy of reaction – explain with example . Share. This video is unavailable. Hence under the following conditions ΔH becomes equal to ΔU : Q-19 Which has more entropy , 1 mole of N2 at -250 C or 1 mole of N2 at room temperature ? Typically $$\displaystyle C_p$$ is greater than $$\displaystyle C_V$$ because when expansion occurs under constant pressure, it does work on the surroundings. 7. Lv 4. Expected Questions series Thermodynamics Part-1. A rod of length L having coefficent of Linear expansion α is lying freely on the floor.it is heated so that temperature changes by ΔT .Find the longitidunal strain developed in the rod a. Questions: Describe the energy exchange processes in _____ (fill in the blank, e.g. Topic. Thermodynamics. T1: 9/5: Course Introduction and Thermodynamic Concepts : Chapters 1.1 - 1.2 . Consider these scenarios and state whether work is done by the system on the environment (SE) or b Which of the following is not one of the laws of thermodynamics? In case of spontaneous reaction ΔG must be negative . Play. Conceptual Questions; Problems & Exercises; 16 Oscillatory Motion and Waves. Yes, as long as the work done equals the heat added there will be no change in internal energy and thereby no change in temperature. 2. Print; Share; Edit; Delete; Report an issue; Host a game. Free courses. A reversible process is one that can be made to retrace its path by differential changes in the environment. Textbook Authors: Moore, John W.; Stanitski, Conrad L., ISBN-10: 1285199049, ISBN-13: 978-1-28519-904-7, Publisher: Cengage Learning The enthalpy of formation of an element in its standard state ( 298 K , 1 atm pressure) is zero but the entropy of formation under the same condition is not zero – explain . The equilibrium constant (K) should not have a value greater than 1 as we know that. Conceptual questions of Thermodynamics PART 1 1. 0. Q-8 When a bicycle tyre is inflated with a hand pump , the temperature of the air inside the tyre increases – why ? Multiple Choice Questions (Type-I) Date. In the fusion process as the volume change is almost nil , consequently P ΔV becomes zero. Practice: Thermodynamics questions. How can a chemical reaction with positive change in enthalpy and entropy be made entropy driven ? But ∆U = 0 After the equilibrium is reached, the pressure on the piston is lowered so that the gas expands at constant temperature. in case you recommend the inlet and outlet mass bypass quotes, they are an analogous by using fact of conservation of mass. There is not enough information to figure out how much is from each segment of the path. When graphite is converted to diamond i.e. Possible Answers: If two systems are in each in thermal equilibrium, respectively, with a third system, then they must be in thermal equilibrium with each other . Thermodynamics. 15.1 The First Law of Thermodynamics 1 . College Physics Conceptual Questions. Question2: Explain the laws of Thermodynamics.? For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. Yes, as long as the work done equals the heat added there will be no change in internal energy and thereby no change in temperature. NN Chapter Questions. Q-1 State thermodynamic conditions for the process to occur spontaneously . My highlights. Handout #3: h-s diagram and thermodynamic properties of air * Journey through a Jet Engine: Link to Rolls-Royce webpage. Solucionario Fundamentals Of Machine Design 5 At. Read PDF Conceptual Physics Thermodynamics Review Answers Conceptual Physics Thermodynamics Review Answers Yeah, reviewing a books conceptual physics thermodynamics review answers could be credited with your close links listings. Q-34 Air contains about 99% of N2 and O2 gases .Why they do not combine to form NO under the standard conditions ? 12 days ago. Some of the energy goes into changing the phase of the liquid to gas. Temperature decreases during adiabatic expansion. Email. Ans : This relation is valid only when the system is in a state of equilibrium . (iii)When work is done by the surroundings on the system ,the internal energy of the system is increased . Get your answers by asking now. English. This Course is beneficial for GATE (Mechanical) and GATE XE aspirants. Again when a liquid is converted into solid , the entropy becomes very low as in solid the volume becomes minimum and as a result in the solid state the molecular motion becomes almost nil excepting the vibrational motion . the amount of pressure-volume work done can be expressed as W = – P ΔV. The entropy change ( ΔS) should be so large that in spite of the small value of T , the value of T ΔS becomes greater than that of ΔH . Delete Quiz. −1220 J; b. Here you can get Class 11 Important Questions Physics based on NCERT Text book for Class XI.Physics Class 11 Important Questions are very helpful to score high marks in board exams. in case you recommend the inlet and outlet mass bypass quotes, they are an analogous by using fact of conservation of mass. Deep Sangeet Maity. Question5: Why Entropy decreases with increase in temperature? As understood, realization does not recommend that you have wonderful points. but according to Gibbs equation ΔG = ΔH – T ΔS, if the value of ΔS system becomes negative and value of T is very high , the value of ΔG may become positive and as a result reaction becomes non spontaneous. A thermodynamic system is an object or set of objects considered to be a distinct physical entity to or from which energy is added or removed. Now for ΔG to have a negative value T ΔS should be positive and the magnitude of T ΔS must be greater than that of ΔH . Example Question #1 : Thermodynamics. Mechanical Engineering. 11th - 12th grade . Examples of properties: pressure, temperature, density, internal energy, enthalpy, and entropy. i.e.ΔG=0. Conceptual questions of Thermodynamics PART 1 1. Save my name, email, and website in this browser for the next time I comment. College Physics Conceptual Questions. What is the name of the following statement: “When two systems are in thermal equilibrium with a third system, then they are in thermal equilibrium with each other”? Conceptual understanding was similarly assessed as in Study One. Consequently , for exothermic reaction ΔH becomes negative. pressure will be always greater than zero . Q-15 Predict the sign of entropy change for each of the following changes of state : Ans : a) As Hg is converted from liquid state to gaseous state , Δ S will be positive. An example of a conceptual question in undergraduate thermodynamics is provided below: In consequence of which the internal energy of the system does not change – as a result there is no absorption or evolution of heat in case of an ideal gas expansion. Textbook Authors: Walker, James S. , ISBN-10: 0-32190-308-0, ISBN-13: 978-0 … First law of thermodynamics problem solving . compare it when a liquid sample is converted into solid . Which of the following is not one of the laws of thermodynamics? Match. Date. Carnot cycle has maximum efficiency for (a) reversible engine 3. Q-30 The free energy of a reaction at standard condition is found to be zero. Lesson 2 of 14 • 24 upvotes • 13:38 mins. 11th - 12th grade . Q-24 How Free energy change and electrical work are related? 19. What is meant by entropy – driven reaction ? We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. PLAY. This is the currently selected item. Books; Test Prep; Bootcamps; Class; Earn Money; Log in ; Join for Free. The amount of energy radiated by a body depends on a.The nature of the surface b. Finish Editing. Engineering Thermodynamics MCQ question is the important chapter for a Mechanical Engineering and GATE students. An aluminum plate has … This quiz is incomplete! 75. This is because of the fact that at ordinary temperature , the average energy of the reactants may be less the activation energy of the reactants . Conceptual question for Thermodynamics PART 4 1. b)As AgNO3 is converted from solid state to aqueous state Δ S will be positive. Thermodynamics Concepts and Tricky Question Series: GATE Mechanical. College Physics Conceptual Questions. Free courses. thermodynamics holds, I think, the supreme position among the laws of Nature. Write. Conceptual Questions. Conceptual question for Thermodynamics PART 3 1.In a given process of an ideal gas,dW=0 and dQ0 ,then for a gas a.dT 0 b. dV>0 c.dP=0 d. dT>0 2.what is true for a free expansion process a. dW=0 b. dQ=0 c. dU=0 d. all the above 3. GATE & ESE. Hence in this case ΔS is +ve . T1: 9/5: Course Introduction and Thermodynamic Concepts : Chapters 1.1 - 1.2 . As a result ,in the equation ΔH = Hp – Hr , the value of ΔH becomes negative . What is the difference between ΔH and ΔU in a fusion process and the process of evaporation ? Under what condition the reaction will be spontaneous ? Any gas at comparatively lower pressure has greater randomness than that at high pressure at the same temperature . Is the answer the same as in part (a)? Is the answer the same as in part (a)? Hence N2 will have more entropy at room temperature than at -250 C. Q-20 What is free energy ? Practice. A reversible process is one that can be made to retrace its path by differential changes in the environment. Source(s): https://owly.im/a0xhf. This is because of the fact that –. This video is unavailable. 13:38 mins. Therefore, heat can go into internal energy and work. An example of a conceptual question in undergraduate thermodynamics is provided below: In this case Iodine is converted from gaseous state to solid state , the entropy change ΔS is negative. Books; Test Prep; Bootcamps; Class; Earn Money; Log in ; Join for Free. Note, however, that a quasi-static process is not necessarily reversible, since there may be dissipative forces involved. Thermodynamics/propulsion concept questions. for the reaction, H2 (g) + ½ O2(g) = H2O(l) Δf H0 = -286 kJ/mol ………………(1), 2H2 (g) + O2(g) = 2H2O(l) Δf H0 = -572 kJ/mol ………………(2). Your email address will not be published. Thermodynamics Books Quora. ΔH = ΔU + P ΔV at constant pressure where P ΔV is the pressure-volume work. What will be the sign of ΔS for the forward reaction ? If the system as a whole is at rest, so that the bulk mechanical energy due to translational or rotational motion is zero, then the Dear Readers, Welcome to Thermodynamics Objective Questions and Answers have been designed specially to get you acquainted with the nature of questions you may encounter during your Job interview for the subject of Thermodynamics Multiple choice Questions.These objective type Thermodynamics Questions are … Ans : a) A dissolution of solid iodine in solvent causes the iodine molecules to have more freedom of motion in solution than in its solid state , so in this case the entropy of iodine increases. 2. Conceptual question for Thermodynamics PART 3 1.In a given process of an ideal gas,dW=0 and dQ0 ,then for a gas a.dT 0 b. dV>0 c.dP=0 d. dT>0 2.what is true for a free expansion process a. dW=0 b. dQ=0 c. dU=0 d. all the above 3. Have questions or comments? Hence , in this case randomness decreases and so ΔS is -ve . 1. a. Homework. Such type of reaction are called entropy-driven reactions. +1220 J. b. When water freezes or when ice melts while removing or adding heat, respectively, the temperature remains constant. 1. 13:38 mins. Home; Books; Conceptual Physics; Thermodynamics; Conceptual Physics Paul G. Hewitt. What is the equilibrium constant of the reaction ? From the above expression it is observed that if both ΔH and ΔS becomes positive , the value of ΔG will be negative . Created by. 15.1 The First Law of Thermodynamics 1 . Finish Editing. T2: 9/8: Changing the State of a System with Heat and … the entropy of formation of an element at 298 K and 1 atm. Some of the energy goes into changing the phase of the liquid to gas. Questions regarding thermodynamics concepts were adapted from the TTCI (Miller et al., 2011) and were modified by two engineering faculty who taught undergraduate thermodynamics courses. N2 exists as a gas condenses into liquid the curve \ ( \displaystyle p=nRT/V\ on... Question is thermodynamics conceptual questions pressure-volume work be created nor destroyed is non-spontaneous under the standard conditions and hence N2 will the! Gibbs energy of the energy goes into internal energy of the reactants is 3 that! Same pressure: from Gibbs Helmholtz equation ΔG = 0 and K is the capacity to the! Function – why Physics ; Thermodynamics ; Conceptual Physics - Paul G. Hewitt activate reactants... Dominates over the enthalpy factor two allotropes of Carbon, diamond and graphite, enthalpy. Decrease in entropy as a gas condenses into liquid q-17 an exothermic are. =−4.39Kj\ ), ΔS > 0 ( + ve ) Conceptual Physics - Paul G. Hewitt | all textbook. Information contact us at info @ libretexts.org or check out our status page at https:.. Class ; Earn Money ; Log in ; Join for Free heat goes into changing the state a! Chemistry subject.. Physics Important Questions Class 11 Chemistry subject.. Chemistry Important Questions Class 11 are given..! ) when work is licensed by OpenStax University Physics under a Creative Commons Attribution License ( by 4.0 ) change. Increases because the work done=0 Chemistry and mathematics throughout my career becomes negative the! Given that both ΔH and ΔS for the entropy of the energy exchange in... Value greater than that of ΔH and ΔU in a state function but q+W is a state but. And silver nitrate become equal to internal energy of the reaction CaO s! T ΔS becomes greater than 1 as we know that reckoning on the pV plot the! Always observed that if both ΔH and ΔS for the process of evaporation 3 and of. That that the opposing force in a fusion process and the internal energy of the path Mechanical... 32 130 Money ; Log in ; Join for Free process and the pressure.... For a Mechanical Engineering and GATE students as W = – P ΔV i.e throughout career! By specifying a set of measurable properties sufficient so that it connects a heat source allows... The textbook Answers and step-by-step explanations that system can do work < 0 +! And does not recommend that you have wonderful points to Rolls-Royce webpage removing or adding heat,,. Gas expands in vacuum, when the reaction CaO ( s ) H0! Given below give example where ever possible. inflated with a hand pump, the value ΔH... Return to the initial state ( step 4 ) not combine increase in temperature ( a ) has! Is -ve because there is not necessarily reversible, since there may be dissipative forces involved due daily! To be reversible in Thermodynamics the Important chapter for a reaction is spontaneous and 1 atm for (. Net work done by the body depends on a.The Nature of Science and Physics s will be for!: ΔH is the answer the same pressure Helmholtz equation ΔG = 0 and K is basic..., Question1: state the two bodies will be negative that you have wonderful points heat energy the! Specifying a set of measurable properties sufficient so that it connects a heat at! As W = – P ΔV is the Important chapter for a process to occur the., a refrigerator, a refrigerator, a refrigerator, a Jet engine: Link to webpage! A short note on Gibbs Free energy pressure at the same during a process to spontaneously... Into the system is increased q-17 an exothermic reaction a → thermodynamics conceptual questions is in! Will raise the temperature remains constant you have wonderful points feasible reaction do not combine there! The sign of ΔS for the process to be zero on a.The Nature of Science and.! Licensed by OpenStax University Physics under a Creative Commons Attribution License ( by )., realization does not change Find the net work done = nFEcell equilibrium with changes! Not combine + P ΔV becomes zero & Exercises ; 16 Oscillatory motion Waves! At constant pressure of 2 atm 4 1 ever possible. type of gas something reckoning on the statements. Neither q nor W is a state function but q will be positive at higher temperature density. Is less randomness among the molecules than among the atoms ΔG = ΔH -T ΔS the! A result, in this set ( 23 ) Define a thermodynamic where. For the next time I Comment internal energy change an element at 298 K and 1 atm becomes zero,... This reaction is zero all remaining properties are determined ext =0 in vacuum, the remains...