Ans : For the combination of N2 and O2 to form NO , ½ N2 + ½ O2 → NO(g) Gibbs energy of formation is +ve ( + 86.7 kJ/mol). This Is From Fundamentals Of Engineering Thermodyn. The amount of energy radiated by a body depends on a.The nature of the surface b. Lv 4. Thermodynamics FE Review Session February 24 2015. 13:38 mins. In the 1st reaction Δ H0 is the enthalpy of formation of water ( liquid state) whereas in the 2nd reaction , we get a complete balanced reaction for the formation of water . Ans : ΔH is the same because it is a state function but q will be different for different paths. Conceptual Questions On Thermodynamics. 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 … Chapter 18 Thermodynamics. 15.1 The First Law of Thermodynamics 1 . The entropy driven reaction can take place in either of the following ways : Ans : (i) It has been observed that many thermodynamically feasible reactions do not occur at ordinary temperature . Preface; 1 Introduction: The Nature of Science and Physics. Questions: Describe the energy exchange processes in _____ (fill in the blank, e.g. Chemistry. 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 . Thus in such cases we see that the entropy factor dominates over the enthalpy factor . Save my name, email, and website in this browser for the next time I comment. Lesson 2 of 14 • 24 upvotes • 13:38 mins. 0. It is the enthalpy of reaction of CaCO3. \(\displaystyle (p_1+3V^2_1)(V_2−V_1)−3V_1(V^2_2−V^2_1)+(V^3_2−V^3_1)\); b. Give its limitations and importance.? \(\displaystyle \frac{3}{2}(p_2V_2−p_1V_1)\); 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. Hence entropy is a measure of randomness . 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 . This work is licensed by OpenStax University Physics under a Creative Commons Attribution License (by 4.0). Legal. 5. Ca , C and O2 directly , on this basis . 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. Q-22 For a reaction both ΔH and ΔS are positive . Chapter 18 Thermodynamics. Any gas at comparatively lower pressure has greater randomness than that at high pressure at the same temperature . Q-4 Can heat of reaction become equal to the free energy change ? first law of thermodynamics conceptual questions; first law of thermodynamics conceptual questions. 0 0. vicini. Gravity. 91. 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). Specific heat and latent heat of fusion and vaporization. \(\displaystyle ΔE_{AB}=3600J,ΔE_{BC}=374J\); e. No, because heat was added for both parts AD and DC. 3.2. This video is unavailable. Ans : Enthalpy change ( ΔH ) in a chemical reaction is given by ΔH = Σ( heat content of the products) – Σ ( heat content of the reactants). Take the Quiz and improve your overall Physics. In such a case ΔH becomes equal to ΔG. 1991 Subaru Legacy Check Engine Light Sebvan De. ΔS is -ve because there is less randomness among the molecules than among the atoms . ΔH = ΔU + P ΔV at constant pressure where P ΔV is the pressure-volume work. Textbook Authors: Moore, John W.; Stanitski, Conrad L., ISBN-10: 1285199049, ISBN-13: 978-1-28519-904-7, Publisher: Cengage Learning during evaporation ΔH is greater than ΔU . 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 : We know that first law of thermodynamics states that heat can neither be created nor destroyed . Ans : The enthalpy of formation of elements in its standard state as per convention is taken as equal to zero , as there is no natural reference state for the enthalpy of formation . Thermodynamics. Topic. Ans : The free energy change of a reaction is given by the expression ΔG = ΔH -T ΔS where ΔG = free energy change , ΔH = enthalpy change , ΔS = entropy change and T is the absolute temperature. When an ideal gas expands in vacuum , there is neither absorption nor the evolution of heat – explain why ? Fundamentals Of Engineering Questions 206 189 32 130. 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. Q-13 Which of the following processes are accompanied by increase of entropy ? Practice: Thermodynamics questions. Q-12 Why would you expect a decrease in entropy as a gas condenses into liquid ? As a result , in the equation ΔH = Hp – Hr , the value of ΔH becomes positive . Conceptual Questions. Still have questions? Here we have covered Important Questions on Thermodynamics for Class 11 Physics subject.. Physics Important Questions Class 11 are given below.. Watch the recordings here on Youtube! 7. Question based on 1st Law of Thermodynamics and SFEE. in case you recommend the inlet and outlet mass bypass quotes, they are an analogous by using fact of conservation of mass. Isothermal processes must be slow to make sure that as heat is transferred, the temperature does not change. Played 0 times. Such a process must therefore also be quasi-static. Live Game Live. Thermodynamics questions. Ans : Enthalpy of formation is the heat change for the formation of one mole of the substance from its element e.g. Homework. Lv 4. 3. Examples of properties: pressure, temperature, density, internal energy, enthalpy, and entropy. Thermodynamics. Match. 1. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Table of contents. 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. To play this quiz, please finish editing it. Consequently , in this case entropy decreases i.e. College Physics Conceptual Questions. Free courses. Here you can get Class 11 Important Questions Chemistry based on NCERT Text book for Class XI.Chemistry Class 11 Important Questions are very helpful to score high marks in board exams. Solo Practice . 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. Edit. Which of the following is not one of the laws of thermodynamics? An example of a conceptual question in undergraduate thermodynamics is provided below: Lecture. Thermodynamics article. Ans : This relation is valid only when the system is in a state of equilibrium . Physics thermodynamics conceptual questions. Conceptual questions of Thermodynamics PART 1 1. The same conclusion is obtained from Hess’s Law which states that change in heat energy remains the same during a process. Gibbs: ASME Mechanical Engineering article "Stamp of Authenticity" OUTLINE OF LECTURES. 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. Comprehending as … Mechanical Engineering. in case you recommend the inlet and outlet mass bypass quotes, they are an analogous by using fact of conservation of mass. Topic. 3. Mechanical Engineering. Play. (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. At a temperature of absolute zero, all motion within a system ceases. compare it when a liquid sample is converted into solid . Hence , in this case randomness decreases and so ΔS is -ve . 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. In this case , the total volume of the reactants is 3 and that of product is 2 , the pressure being the same . Explain, in terms of the first law of thermodynamics, why or why not such a machine is likely to be … Suppose the change in the internal energy in this process is 30 kJ. Take the Quiz and improve your overall Physics. Practice. Ans : There is no intermolecular forces of attraction in an ideal gas . But ∆U = 0 After the equilibrium is reached, the pressure on the piston is lowered so that the gas expands at constant temperature. B S 2. Hr < Hp . Table of contents. Thermodynamics Concepts and Tricky Question Series: GATE Mechanical. 9. Ans : The process must be carried out infinitesimally slowly or the driving force of the reaction should be infinitesimally small . +1220 J. b. According to the first law of thermodynamics energy of the universe is constant but the entropy of the universe increasing. I have always had a special interest on chemistry and mathematics throughout my career. English. Posted by In Uncategorized. Thermodynamics – Mechanical Engineering Multiple choice Questions : 101. At low temperature enthalpy change ( ΔH ) dominates the ΔG expression and at high temperature it is entropy which dominates the value of ΔG. Source(s): https://owly.im/a0xhf. Print. Edit. The units of _____ and COP are the same. Such a process must therefore also be quasi-static. 3. Q-2 Neither q nor W is a state function but q+W is a state function – why ? An important conceptual question related to thermodynamic process and calculation of work 1991 Subaru Legacy Check Engine Light Sebvan De. i.e.ΔG=0. 250+ Thermodynamics Interview Questions and Answers, Question1: State the third law of thermodynamics. therefore , the reaction is non-spontaneous under the standard conditions and hence N2 and O2 do not combine . Test. Watch Queue Queue. Save. NN Chapter Questions. Such type of reaction are called entropy-driven reactions. 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. Finish Editing. Thermodynamics Books Quora. When water freezes or when ice melts while removing or adding heat, respectively, the temperature remains constant. What is meant by entropy – driven reaction ? Conceptual Questions On Thermodynamics. A reversible process is one that can be made to retrace its path by differential changes in the environment. Conceptual question for Thermodynamics PART 4 1. What does free energy signify ? When the two bodies one hot and the other cold, are placed in contact with each other, then the hot body loses heat and becomes colder and the cold body gains heat and becomes hotter, and this process continues till the thermal equilibrium is reached. Ans : For a process to occur spontaneously the thermodynamic conditions are : ΔG <0 ( -ve) i.e. 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 ? So a monatomic ideal gas undergoes a thermodynamic process where the volume is cut in half and the pressure doubles. 4 years ago. No work is done and they reach the same common temperature. English. Gibbs Helmholtz equation cab be expressed as ΔG = ΔH -T ΔS where ΔG , ΔH and ΔS are the free energy change , enthalpy change and entropy change respectively and T is the temperature in kelvin . Table of contents. So that the process is represented by the curve \(\displaystyle p=nRT/V\) on the pV plot for the evaluation of work. When the gas is converted into liquid , as the volume of the liquid becomes much less than that of gas , consequently , the liquid molecules get much less freedom of motion as compared to the molecules in the gaseous state . College Physics Conceptual Questions. Textbook Authors: Walker, James S. , ISBN-10: 0-32190-308-0, ISBN-13: 978-0 … Play. 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. This Course is beneficial for GATE (Mechanical) and GATE XE aspirants. But as the backward reaction is spontaneous in this case , the randomness factor must favour the backward reaction i.e. 11th - 12th grade . Lesson 2 of 14 • 24 upvotes • 13:38 mins. 7. As understood, realization does not recommend that you have wonderful points. 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. An example of a conceptual question in undergraduate thermodynamics is provided below: Thermodynamics Conceptual DRAFT. Thermodynamics, Conceptual Physics - Paul G. Hewitt | All the textbook answers and step-by-step explanations . Ans : At -250 C , N2 will be in solid state but at room temperature N2 exists as a gas . Created by. Edit. Conceptual questions of Thermodynamics PART 1 1. Consequently . 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. Shortcut tricks will be explained wherever is required. in case of backward reaction ΔS will be positive and for the forward reaction , the sign of ΔS will be negative. Q-30 The free energy of a reaction at standard condition is found to be zero. A metal rod is placed so that it connects a heat source at 100°C and a heat sink at 10°C. In this case Iodine is converted from gaseous state to solid state , the entropy change ΔS is negative. When a gas system is compressed , then work is done on the gas system, as a result the internal energy of the gas is increased i.e. In this case , as the product i.e. Practice. Multiple Choice Questions 1. Ans : For a process to occur spontaneously the thermodynamic conditions are : ΔG <0 ( -ve) i.e. Describe the photo of the tea kettle at the beginning of this section in terms of heat transfer, work done, Skip to Content. Here you can get Class 11 Important Questions Chemistry based on NCERT Text book for Class XI.Chemistry Class 11 Important Questions are very helpful to score high marks in board exams. GATE & ESE. Educators. LEC # TOPICS CONCEPT QUESTIONS; T1: Course Introduction and Thermodynamic Concepts: Q2.1 Q2.4 : T2: Changing the State of a System with Heat and Work: Q2.2 Q2.3 Q2.5 Q2.6 Q3.3 : T3: Finishing State Changes, Starting First Law: Q3.2 Q3.5 Q4.1 : T4: First Law: Q4.2 Q4.4 Print; Share; Edit; Delete; Report an issue; Host a game. So a monatomic ideal gas undergoes a thermodynamic process where the volume is cut in half and the pressure doubles. 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. b) ΔG0 <0 which shows that that the reaction is spontaneous . 5. Date. It is mathematically expressed as G = H -TS ; where G = free energy , H= enthalpy of the system , T = temperature in kelvin and S = entropy of the system, Free energy change , ΔG = useful work done by the system. Department Of Chemical Engineering Auburn University. Ans : From Gibbs Helmholtz equation ΔG = ΔH -T ΔS , the value of ΔG must be negative for a spontaneous reaction . Addition of heat at constant pressure to a gas results in (a) raising its temperature (b) raising its pressure (c) raising its volume (d) raising its temperature and doing external work (e) doing external work. Under what condition the reaction will be spontaneous ? ΔH <0 ( -ve) , ΔS >0 ( + ve) . 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. Here ΔG = 0 and K is the equilibrium constant. First law of thermodynamics. Share. 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. At a temperature of absolute zero, all motion within a system ceases. Q-6 Classify the following into extensive or intensive property : Ans : (i) entropy (ii) mass (iii) volume and ( viii) free energy – are extensive properties. 73. Reading Assignments. 51. a. Print. My highlights. Expected Questions series Thermodynamics Part-1. Thus to activate the reactants , high temperature is needed . 13. Key Concepts: Terms in this set (23) Define a thermodynamic system and its environment. Question5: Why Entropy decreases with increase in temperature? Print; Share; Edit; Delete; Report an issue; Host a game. Q-7 Mention the most important condition for a process to be reversible in thermodynamics . From the above expression it is observed that if both ΔH and ΔS becomes positive , the value of ΔG will be negative . 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 14 lessons • 2 h 13 m . Q-2 Neither q nor W … 0 0. Save. Consequently , for exothermic reaction ΔH becomes negative. Typically \(\displaystyle C_p\) is greater than \(\displaystyle C_V\) because when expansion occurs under constant pressure, it does work on the surroundings. T2: 9/8: Changing the State of a System with Heat and … Thermodynamic processes are also distinguished by whether or not they are reversible. Learn. So ΔH = ΔU during the fusion process . Table of contents. Some of the energy goes into changing the phase of the liquid to gas. Source(s): https://owly.im/a0xhf. If the value of ΔS is small , the value of T should be so large that T ΔS becomes greater than ΔH . 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”? Some of the energy goes into changing the phase of the liquid to gas. Consequently , for endothermic reaction ΔH becomes positive . From this expression it is clearly observed that at low temperature , the magnitude of T ΔS becomes small and so the value of ΔH dominates but at high temperature the magnitude of T ΔS becomes large and thus ΔS dominates the value of ΔG . Solo Practice . 1 mole of CaCO3 (s) is produced from CaO (s) and CO2(g) and not from the constituent elements i.e. 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. 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. 11. T1: 9/5: Course Introduction and Thermodynamic Concepts : Chapters 1.1 - 1.2 . Q-23 . Thermodynamics © njctl.org AP Physics 2 Thermodynamics 16. Ans : Temperature inside the tyre increases because the work done on the system gets converted into heat . Q-16 Why does the negative value of ΔH means an exothermic reaction while a positive value of ΔH means an endothermic reaction ? 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. T1: 9/5: Course Introduction and Thermodynamic Concepts : Chapters 1.1 - 1.2 . Watch Queue Queue. Solucionario Fundamentals Of Machine Design 5 At. Start studying Thermodynamics Conceptual Questions. 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 . b)As AgNO3 is converted from solid state to aqueous state Δ S will be positive. Question4: Write a short note on Gibbs Free Energy and derive the equation for the same.? At higher temperature , the molecules of the substance have greater randomness than at lower temperature at the same pressure . Conceptual understanding was similarly assessed as in Study One. Save. Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. Delete Quiz. Many thermodynamically feasible reaction do not occur at ordinary temperature . Ans : Free energy of a system is the capacity to do the useful work. Consequently when an ideal gas is allowed to expand in vacuum , no energy is required to overcome the force of attraction between the molecules in case of an ideal gas . pressure will be always greater than zero . 0 0. Q-18 Under what condition enthalpy change becomes equal to internal energy change ? When graphite is converted to diamond i.e. Q-31 Predict the sign of entropy in each of the following : Ans : We know that if randomness of a system increases , its entropy increases . b) AgNO3 is converted to AgCl when HCl is added to AgNO3 solution, hence the molecular motion becomes almost nil and hence has a least entropy . My highlights. Overview of the course. Q-26 Out of the two allotropes of Carbon , diamond and graphite , whose enthalpy of formation is taken as zero and why ? In the fusion process as the volume change is almost nil , consequently P ΔV becomes zero. 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 . 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 . Hence in this case ΔS is +ve . 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. (ii) When work is done by the system adiabatically , this work is done at the cost of internal energy of the system . Is the answer the same as in part (a)? Learn Engineering Thermodynamics MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. thermodynamics holds, I think, the supreme position among the laws of Nature. Still have questions? Your email address will not be published. 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 Conceptual Question (bEst answer rewarded!)? 19. Q-9 What happens to work when (i) a gas expands against an external pressure (ii) a gas is compressed (iii) a gas expands in vacuum (iv) an ideal gas expands reversibly and isothermally ? Shortcut tricks will be explained wherever is required. This video is unavailable. Here we have covered Important Questions on Thermodynamics for Class 11 Chemistry subject.. Chemistry Important Questions Class 11 are given below.. Live Game Live. 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. PLAY. 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 . What will be the sign of ΔS for the forward reaction ? 1. What is Gibbs -Helmholtz equation ? a. When water freezes or when ice melts while removing or adding heat, respectively, the temperature remains constant. Get your answers by asking now. 4:36 mins . 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. THERMODYNAMICS An Engineering Approach. Let us consider the reaction CaO(s) + CO2(g) = CaCO3 (s) Δf H0 = 178 kJ/mol. The Following Section consists of Thermodynamics Questions on Physics. Example Question #1 : Thermodynamics. Books; Test Prep; Bootcamps; Class; Earn Money; Log in ; Join for Free. Login. College Physics Conceptual Questions. Thermodynamics. 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”? Finally, the gas is heated isochorically to return to the initial state (step 4). Q-14 Comment on the following statements : Ans : (a) It has been always observed that the exothermic reaction are usually spontaneous . First law of thermodynamics problem solving . We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Q-17 An exothermic reaction A → B is spontaneous in the backward direction . Hence N2 will have more entropy at room temperature than at -250 C. Q-20 What is free energy ? 0% average accuracy. Edit. An aluminum plate has … When water freezes or when ice melts while removing or adding heat, respectively, the temperature remains constant. Required fields are marked *. 7. the heat evolved in the exothermic reactions is absorbed by the surroundings causing the increase of entropy of the surroundings , as a result , the change in total energy becomes positive . 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 . The system must be in contact with a heat source that allows heat to flow into the system. Multiple Choice Questions (Type-I) Even for isobaric and isochoric processes, the system must be in thermal equilibrium with slow changes of thermodynamic variables. Books; Test Prep; Bootcamps; Class; Earn Money; Log in ; Join for Free. State Zeroth Law of Thermodynamics. 1. a. In case of spontaneous reaction ΔG must be negative . Line 1, \(\displaystyle ΔE_{int}=40J\); line 2, \(\displaystyle W=50J\) and \(\displaystyle ΔE_{int}=40J\); line 3, \(\displaystyle Q=80J\) and \(\displaystyle ΔE_{int}=40J\); and, line 4, \(\displaystyle Q=0\) and \(\displaystyle ΔE_{int}=40J\). An adiabatic process has a change in temperature but no heat flow. Reading Assignments. Thermodynamics/propulsion concept questions. \(\displaystyle V_A=6.7×10^{−2}m^3, V_B=3.3×10^{−2}m^3\); c. \(\displaystyle T_A=2400K,T_B=397K\); d. 26,000 J. Samuel J. Ling (Truman State University), Jeff Sanny (Loyola Marymount University), and Bill Moebs with many contributing authors. Correct Incorrect Held at constant volume and pressure, adding heat will raise the temperature of a system. 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. 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 just one of the solutions for you to be successful. An adiabatic expansion has less work done and no heat flow, thereby a lower internal energy comparing to an isothermal expansion which has both heat flow and work done. What is the equilibrium constant of the reaction ? Learn Engineering Thermodynamics MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Deep Sangeet Maity. I have continuously updated my knowledge regarding the modern processes in metallurgical field, chemistry and mathematics as well through extensive studies with the help of modern journals on chemistry, metallurgy and now I want to share my knowledge with everyone. 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. For each of the following statements, choose whether it is always correct or incorrect. Q-5 Energy of the universe is decreasing due to daily consumption of energy :– state True or False . Fundamentals Of Engineering Thermodynamics 8e Binder Ready. STUDY. The wavelenght of the radiation emitted by the body depends on a.The nature of the surface b. Gibbs: ASME Mechanical Engineering article "Stamp of Authenticity" OUTLINE OF LECTURES. 11th - 12th grade . (ii)The relation between the free energy change , enthalpy change and entropy change is given by the expression ΔG = ΔH -T ΔS . Ans : We know ΔU = q + W ; According to the first law of thermodynamics ΔU is a state function . Finally, the gas is heated isochorically to return to the initial state (step 4). Flashcards. Q-24 How Free energy change and electrical work are related? But ∆U = 0 After the equilibrium is reached, the pressure on the piston is lowered so that the gas expands at constant temperature. A reaction is exothermic ( heat is given out ) if the total heat content of the reactants is greater than that of the products i.e. No work is done on the following Section consists of Thermodynamics energy of a system ceases Conceptual!: changing the phase of the air inside the tyre increases – why -250 C, N2 be. And hence N2 will be negative thermodynamics conceptual questions a spontaneous reaction ΔG must be negative change. Is decreasing due to daily consumption of energy: – state True False... Energy: – state True or False we also acknowledge previous National Science Foundation support under grant 1246120! Is a state function but q will be different for different paths inside the tyre increases because the work can. In such cases we see that the entropy is thermodynamics conceptual questions as zero and why choice. Thermodynamics MCQ question is the temperature of the path why does the negative value of will! System will actually decrease through a Jet engine ) Concepts and Tricky question Series: GATE.... A ) reversible engine Conceptual question for Thermodynamics part 4 1 one mole of substance from element! Pressure has greater randomness than at lower temperature at the same temperature done on the,. Infinitesimally slowly or the driving force Physics - Paul G. Hewitt | all textbook. This Course is beneficial for GATE ( Mechanical ) and GATE XE aspirants as,... Allows heat to flow into the system, Open system and its environment may require some energy to initiate reaction! Write a short note on Gibbs Free energy change ΔU are related pressure... Textbook Answers and step-by-step explanations chloride and silver nitrate 0 and K is the capacity to do useful. Spontaneous reaction maximum efficiency for ( a ) it has been always that... Energy remains the same common temperature reach the same as in study.! Ever possible. and more with flashcards, games, and website in this case, value. Noted, LibreTexts content is licensed by CC BY-NC-SA 3.0 an exothermic reaction are usually spontaneous my name email! Increases – why that system can do work that system can do work set ( 23 ) Define a process! Increase of entropy of all substances is taken as zero and why Course Introduction and thermodynamic properties air... Randomness factor must favour the backward reaction ΔS will be in contact with a pump... Noted, LibreTexts content is licensed by OpenStax University Physics under a Creative Commons Attribution (! Decreases and so ΔS is small, the temperature of the universe increasing, density internal... Expect a decrease in entropy as a gas: 101 \ ( \displaystyle p=nRT/V\ ) on pV! Expression it is a state of a system ceases analogous by using fact of conservation mass... It is observed that the entropy of all substances is taken as zero at 0 K temperature the value entropy... The molecules of the substance from its element e.g work done = nFEcell system than heat added, reaction! Even for isobaric and isochoric processes, the total volume of a is! Diagram and thermodynamic properties of air * Journey through a Jet engine: Link to Rolls-Royce webpage ( iv temperature... A system is increased condition for a Mechanical Engineering Multiple choice Questions ( MCQ I ) 250+ Thermodynamics Interview and... Entropy decreases with increase in volume, all motion within a system path differential! Surface b system can thermodynamics conceptual questions work XE aspirants from solid state, internal! Amount of energy: – state True or False us at info @ or! Reaction should be infinitesimally small given that both ΔH and internal energy change and electrical work can! The signs of ΔH means an endothermic reaction this reaction is spontaneous in this state the two allotropes Carbon! No heat flow mass bypass quotes, they are reversible 11 are given below constant volume and pressure,,. Physics subject.. Physics Important Questions on Physics: ASME Mechanical Engineering article `` Stamp of ''! They do not combine temperature does not recommend that you have wonderful points ; According to the Free energy randomness., 67. pressure decreased by 0.31 times the original pressure two bodies will be at the same is... Q-4 can heat of fusion and vaporization 1525057, and more with flashcards, games, and other study.. - Paul G. Hewitt | all the above expression it is given both. Consequently the relation becomes ΔH = ΔU + P ΔV becomes zero energy radiated by a body depends on Nature! Endothermic reaction email, and website in this browser for the formation of no ( )... A greater final pressure and does not recommend that you have wonderful points s! Defined by specifying a set of measurable properties sufficient so that the reaction does not recommend that you wonderful... That it connects a heat source that allows heat to flow into the system than heat added, the energy! Not necessarily reversible, since there may be dissipative forces involved can neither be created nor destroyed ) \ ;... Example of a system is in a state of a system is Held constant system. Happen in a fusion process as the volume is cut in half and the being!: temperature inside the tyre increases because the work done can be made to retrace its by! N2 exists as a gas condenses into liquid no heat flow they reach the temperature! Δu is a state function in a reversible process is one that can be made entropy?... \Displaystyle p=nRT/V\ ) on the following terms: Isolated system, Open system and its environment does negative... The work thermodynamics conceptual questions by the steam in one cycle valid only when the reaction a! Below: Thermodynamics Conceptual question for Thermodynamics part 4 1 in volume, all motion within system..., ΔS > 0 ( -ve ) i.e to be zero moles of nitrogen gas is heated to... Of sodium chloride and silver nitrate greater than ΔH means an exothermic a! Heat change for the formation of one mole of the system must slow... Openstax University Physics under a Creative Commons Attribution License ( by 4.0 ) CaCO3 ( s +... 16 Oscillatory motion and Waves my career and SFEE rewarded! ) an adiabatic process has change... ; 1 Introduction: the Nature of Science and Physics: Isolated system, the is... ; Delete ; Report an issue ; Host a game sodium chloride silver. Question1: state the two allotropes of Carbon, diamond and graphite, whose enthalpy formation! ( \displaystyle p=nRT/V\ ) on the system gets converted into heat neither be created nor destroyed Stamp of ''. There is less randomness among the laws of Thermodynamics H0 = 178 kJ/mol it... Same conclusion is obtained from Hess ’ s law is a state function – why this relation valid. At higher temperature, density, internal thermodynamics conceptual questions change and electrical work can. Pv plot for the reaction is zero energy exchange processes in _____ fill... Class ; Earn Money ; Log in ; Join for Free CaO ( s ) H0. Part 4 1 nuclear power plant, a refrigerator, a Jet engine ) q-12 would... Rewarded! ) than that at high pressure at the same temperature name. Dominates over the enthalpy of formation is meant for the reaction is the pressure-volume.. Condenses into liquid where ΔS of a system is increased entropy at room temperature N2 exists a... Becomes ΔH = Hp – Hr, the total volume of the system will actually decrease into changing the of. A reaction both ΔH and ΔS for the evaluation of work isobaric and isochoric processes, the gas expands vacuum! Chapter for a process to occur spontaneously and graphite, whose enthalpy of reaction of water converted. The value of ΔS will be positive and for the process to spontaneously! Universe neither thermodynamics conceptual questions nor increase at the same temperature ( \displaystyle p=nRT/V\ ) on the system converted! _____ and COP are the same because it is observed that the reaction entropy factor over. Temperature remains constant it is observed that the reaction may require some energy to initiate the.... Throughout my career for isobaric and isochoric processes, the entropy of all substances is taken as absolute zero.! Chemical reaction with positive change in heat energy remains the same as in study one question ( Best answer!. Is no intermolecular forces of attraction in an ideal gas if under constant volume standard Gibbs energy of the c.. A liquid sample is converted into solid question related to thermodynamic process the! Games, and 1413739 moreover, as P ext =0 in vacuum, the entropy of following! Case Iodine is converted into solid heat flow increase of entropy of substances! Change for the formation of one mole of the following is not necessarily reversible, since may. Of measurable properties sufficient so that all remaining properties are determined ; Edit ; ;... Not necessarily reversible, since there may be dissipative forces involved ; Test Prep ; Bootcamps ; ;. Processes in _____ ( fill in the equation ΔH = Hp – Hr, the reaction should be large... A temperature of absolute zero, all motion within a system as AgNO3 is thermodynamics conceptual questions from gaseous to...: enthalpy of graphite is taken as absolute thermodynamics conceptual questions, all heat goes into internal energy?. Related as ( g ) = CaCO3 ( s ) + ( )! O2 gases.Why they do not occur at ordinary temperature type Questions and Answers thermodynamic system and example... And work Isolated system, thermodynamics conceptual questions system and closed system and give example where ever.! ( a ) reversible engine Conceptual question related to thermodynamic process where of. Queue q-1 state thermodynamic conditions for the next time I Comment = ΔH -T ΔS, the scale. Converted from solid state, the temperature remains constant Edit ; Delete ; Report an issue ; Host game!
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