64) A. At equilibrium, ________. United States, (+ From Midterm Exam 2: 1.14 J/(g C) What Is The Equilibrium Expression For H2 I2 2Hi? Quick Answer C. -16.0 kJ The molar mass of sugar is 342.3 g/mol. Netherlands, (+ 1) A) N2O4 (g) 2NO2 (g) Understudies who are planning for different school tests, for example, unit-tests, term-tests, semester tests, half-yearly and yearly tests and assessments on Chemistry-Class 12. For these conditions, what is the value of Kp for the reaction that occurred: +238 kJ A galvanic cell designated as Close by that it helps the students with growing the overall appreciation in the subject and work on the data in the assessments. Afghanistan, (+ (NH4)2Se (s) 2NH3 (g) + H2Se (g) PART B: C. 1.94 49) 2A+B2C+2D Detailed description of the questions is given by subject experts and you can use them as a reference during your preparation. E) only reactants are present, 23) The equilibrium constant for the gas phase reaction You'll get a detailed solution from a subject matter expert that helps you learn core concepts. E. 0.371, From Midterm Exam 2: A 250 mL sealed flask contains 0.65 g of butane at 22C.] Bangladesh, (+ HC2H3O2 1.8105] 855) D. 0.420 Or if any of the following reactant substances I2 (iodine), disappearing You can utilize the quick links on our page to view or download the CBSE MCQs of all classes in an easy way. 973) The equilibrium constant K p is independent of (A) Total pressure (B) Catalyst (C) The amounts of H 2 and I 2 present However, it changes with Temperature E. none of the above. D) 1.90 1019 D. C2H3O2-/HC2H3O2 -25.5 kJ 91) 27.3 kJ mol-1 E) only reactants are present, 22) The equilibrium constant for the gas phase reaction (Assume ideal behavior.). D. Energy is neither created nor destroyed, excluding nuclear reactions. 2COF2(g)CO2(g)+CF4(g), Kc=6.30 B. South Africa, (+ Q: What is the percent ionization of ammonia at this concentration? Energy can be transferred in many ways, one of which is in the form of work. A) [SO3] / [SO2][O2] (i) The value of K increases as the system approaches equilibrium. A. Erxn can be determined using constant volume calorimetry. Part A: What is the value of E for the combustion of the fuel? Belgium, (+ 9.64 93) Hydrogen iodide undergoes decomposition according to the equation 2HI (g) H2 (g) + I2 (g) The equilibrium constant Kp at 500 K for this equilibrium is 0.060. Assuming no loss of heat to the surroundings, what is the final temperature of the mixture? B. B) H2 (g) + Cl2 (g) 2 HCl (g) (ii) The value of K decreases as the system approaches equilibrium. What is the boiling point of water at an elevation of 1.00104 ft ? [Nickel and aluminum electrodes are used to build a galvanic cell. Guinea, (+ Calculate Erxn for the combustion of sucrose in kJ/mol sucrose. 230) 100 Br2 (g) + Cl2 (g) 2BrCl (g) United States, (+ For example, for the following equilibrium: H2(g) + I2(g) 2 HI(g); For . The system is losing 115 J, while the surroundings are gaining 115 J, A. energy associated with the temperature of an object, D. energy associated with the motion of an object, D. energy associated with the position or composition of an object. N2(g)+O2(g)+Br2(g)2NOBr(g). B. [When 1 mol of a fuel is burned at constant pressure, it produces 3455 kJ of heat and does 12 kJ of work] At equilibrium, ________. 91) C. 16.6 kJ 1) In chemical equation H2(g) + I2(g) 2HI(g), the equilibrium Kp depends 27) How is the reaction quotient used to determine whether a system is at equilibrium? The reaction mixture will contain [A]=0.1M and [B]=1.0M. Bahrain, (+ H2(g)+I2(g)2HI(g) , K=6.2102 Calculate the equilibrium constant Consider a cell that is built using the following two half-reactions, For a chemical equilibrium reaction H2(g) + I2(g) 2HI(g) 37.5 g B. Cd(s) + 2 Ag+(aq) Cd2+(aq) + 2 Ag(s), Calculate E cell H2(g)+I2(g)2HI(g) Which of the following statement is/are true? H2 (g) + I2 (g) HI (g) A) 25 B) 2500 C) 7.07 D) 100 E) -50 C) 7.07 Q2. Enter the email address you signed up with and we'll email you a reset link. 348) . 2HI(g) I, M 1.00 1.00 0 C, M -x -x +2x . Use the bond energies provided to estimate Hrxn for the reaction below. Switzerland, (+ HF (aq) + H2O (l) H3O+ (aq) + F- (aq) When a reactio. Georgia, (+ C) roughly equal amounts of products and reactants are present 5) Which of the following expressions is the correct equilibrium-constant expression for the following reaction? 34) A. - A gas can be converted into a liquid by cooling. For the reaction, H2(g) + I2(g) 2HI(g) , the equilibrium constant Kp The osmotic pressures required for this process can be as high as 18.6 atm . Egypt, (+ B. Zimbabwe, (+ The value of pH is somewhat higher than 6.65. C. 5.25 J/(g C) Explain why chlorine occurs as diatomic molecules in nature rather than individual atoms. E. In equilibrium, the ratio [P] / [A] is equal to k / k'. Exams . 2.30 We reviewed their content and use your feedback to keep the quality high. 50.0 g Cu, CCu = 0.385 J/gC Assume excess SiO2. 87.0C (R = 0.0821 L atm/ (K mol)) A. B. K=0 The reaction : N 2O4 2N O2 J & K CET 2018 8. NCERT Exemplars are basically practice-books that contain additional questions of higher level and give you comprehensive and thorough learning. Q: What is the pH of a 0.240 M ammonia solution? B. increase volume This multitude of MCQs with answers are delivered by subject specialists for a wide range of understudies. C. +873 J mol-1 46) . Strong bonds break and weak bonds form. 380) D) [SO3]2 / [SO2]2[O2]2 A. In chemical equation H2 (g) I2 (g) 2HI (g) the equilibrium constant C. 150 g So, visit our site and easily find MCQs for all subjects classwise. 64) SiO2(s) + 4 HF(g) SiF4(g) + 2 H2O(l) Hrxn = -184 kJ C. Neither direction is favored. @X UBBIS Digitized by the Internet Archive in 2019 with funding from University of Alberta Libraries https ://arch i ve . B. 31) B) N2O4 (g) 2NO2 (g) CH3Cl(g)+Cl2(g)CH2Cl2(g)+HCl(g), H=105.8 kJ, Use the standard reaction enthalpies given below to determine Hrxn for the following reaction: A 250 mL sealed flask contains 0.65 g of butane at 22C.] 41) A second-order reaction of the type 2A P was carried out in a solution with the initial concentration of A being [A]0 = 1.5 mol L-1. AB2(g) + B(g) AB3(g) Kc = ? Which of the following statements is correct for the triple point (TP) and critical point (CP) of a material. C. CF4 C. The bonds that break and those that form are of approximately the same strength. D. At any time, the ratio [P] / [A] is equal to k' / k. A. B) Keq does not change with temperature, whereas Q is temperature dependent. at a certain temperature. C. surface tension 17.9 A homogeneous equilibrium reaction exists when all the components of the reaction are in the same phase (i.e., gas, liquid, solid, aqueous). 2 HBr(g) H2(g) + Br2(g) Kc = ? Finland, (+ A) increase the rate of the forward reaction only 995) A. BF3 20) 34) 2003-2023 Chegg Inc. All rights reserved. D. - 1.23 x 103 kJ/mole. At body temperature (37C), Kw=2.41014] What is the standard free energy change (Grxn) for this reaction? From Midterm 3: B. H2SO3/HSO3- D. increase reactant A. Thus, by adding a small amount of I2, neither side would be favored since the constant shows that little I2 would be produced. Ukraine, (+ is Keq = 3.6 10-3 at 999 K. At equilibrium, ________. From Midterm 3: Consider the chemical equation and equilibrium constant at 25C: C. OH- E) all of the above, 32) Consider the following reaction at equilibrium: A) 5.4 10-13 The value of pH is somewhat higher than 2.13. B) reactants predominate Afghanistan, (+ Solved Hydrogen iodide undergoes decomposition according to - Chegg Equilibrium constant expression in terms of partial pressures Asked by sumandeesinghrana | 12 Oct, 2010, 03:00: PM Expert Answer Dear Student For the reaction H 2 + I 2 --------> 2HI 48) D. CH3OH, D. CH3OH Thusly, students who have started their board test course of action can include the NCERT Chemistry MCQ Questions for Class 12 with Answers. H2 (g) + I2 (g) 2HI (g) B. B. HPO42- C) 0.020 358) . South Korea, (+ 93) +1251 J mol-1 52) Q: What is the [H3O+] in pure water at body temperature? 1) Given: Experts are tested by Chegg as specialists in their subject area. D. -0.91C E) none of the above, 15) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? Refer to the list of electrode potentials below to answer parts a to d. Ag+(aq)+eAg(s)voltage=+0.80VCo2+(aq)+2eCo(s)voltage=0.28VCu2+(aq)+2eCu(s)voltage=+0.34VPb2+(aq)+2ePb(s)voltage=0.13VZn2+(aq)+2eZn(s)voltage=0.76V\begin{array}{ll} B. Choose the molecule or compound that exhibits dispersion forces as its strongest intermolecular force. Consider the chemical equation and equilibrium constant at 25C: 1.00 10-14 New Zealand, (+ United Arab Emirates, (+ B. A sample of NO gas was introduced into a container such that the initial partial pressure of NO was 560 torr. 17-2 The value of Q increases as a function of time until it reaches the value of K. b) No, Q would still increase with time because the [I2] would decrease in exactly the same way as [H2] decreases. A. Identify the change that will always shift the equilibrium to the right. The lightbulb is turned on for 0.015 h, and the assembly expands from an initial volume of 0.90 L to a final volume of 5.89 L against an external pressure of 1.0 atm] B. 82) H2 (g) + I2 (g) 2HI (g) At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M, . 2075 B) H2 (g) + Cl2 (g) 2 HCl (g) DOC Chapter 14 - CHEMICAL EQUILIBRIUM For instance, it is used to make the refrigerant carbon tetrafluoride, CF4 via the reaction The people who need to get the passing marks in the CBSE class twelfth board test can use the Chemistry Multiple choice requests to practice. Q: What can you conclude about the equilibrium constant (K) for the reaction? 2 CH3OH(l) + 3 O2(g) 2 CO2(g) + 4 H2O(g) (Assume that the cylinder and lightbulb assembly comprise the system and assume two significant figures. B. 92) 1 Answer +1 vote answered Dec 12, 2019 by Kajal01 (25.8k points) Answer (c) amount of H2 and I2 Prev Question Next Question Equilibrium constant Kp is equal to the partial pressure of products divided by partial pressure of reactants and the partial pressure are raised with some power which is equal to the coefficient of the substance in balanced equation. A constant horizontal force of 290N290 \mathrm{~N}290N is applied to the crate to push it up the ramp. Part B: What is the value of H for the combustion of the fuel? E) -50, 14) Given the following reaction at equilibrium, if Kc = 1.90 1019 at 25.0 C, Kp = ________. A. The equilibrium mixture contained 1.37 10 2 M HI, 6.47 10 3 M H2, and 5.94 10 4 M I2. A) 25 From Midterm 3: What is the hydronium ion concentration of a 0.150 M hypochlorous acid solution with K a = 3.5 10-8? [The half-life for the radioactive decay of U238 is 4.5 billion years and is independent of initial concentration] These numerous decision inquiries for Chemistry Class 12 will assist with further developing logical and complex issue unraveling abilities. C. 1-pentanol The gases react to form l-l] according to the equation above. 0.183 Provide your answer in units of volts (V). M. What is the half-life, t1/2, for this reaction in units of seconds ? Determine the pH value at 25C for a 0.062 M solution of a base that is 100% dissociated. Yes, our website is the one-stop search for all CBSE Board Examination related sources like questions papers, syllabus, exam pattern, sample papers, and Multiple choice questions papers. E. All of the above are true. Thank you for your participation! -333 kJ 15.2: The Equilibrium Constant (K) - Chemistry LibreTexts
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