2SO 2(g) + O 2(g) Increasing the temperature. (Total 1 mark) Enthalpy data for the reacting species are given in the table below.
|
|
- Lesley Collin Grant
- 5 years ago
- Views:
Transcription
1 Q1.Which change would alter the value of the equilibrium constant (K p) for this reaction? 2SO 2(g) + O 2(g) 2SO 3(g) A Increasing the total pressure of the system. Increasing the concentration of sulfur trioxide. C Increasing the concentration of sulfur dioxide. Increasing the temperature. Q2.This question is about the reaction given below. CO(g) + H 2O(g) CO 2(g) + H 2(g) Enthalpy data for the reacting species are given in the table below. Substance CO(g) H 2O(g) CO 2(g) H 2(g) ΔH / kj mol Which one of the following statements is not correct? A C The value of K p changes when the temperature changes. The activation energy decreases when the temperature is increased. The entropy change is more positive when the water is liquid rather than gaseous. The enthalpy change is more positive when the water is liquid rather than gaseous. Page 2
2 Q3.The equation for the combustion of butane in oxygen is C 4H O 2 4CO 2 + 5H 2O The mole fraction of butane in a mixture of butane and oxygen with the minimum amount of oxygen required for complete combustion is A C C Page 3
3 Q4.This question relates to the equilibrium gas-phase synthesis of sulphur trioxide: 2SO 2(g) + O 2(g) 2SO 3(g) Thermodynamic data for the components of this equilibrium are: SO 3(g) SO 2(g) O 2(g) This equilibrium, at a temperature of 585 K and a total pressure of 540 kpa, occurs in a vessel of volume 1.80 dm 3. At equilibrium, the vessel contains mol of SO 2(g), mol of O 2(g) and mol of SO 3(g). The mole fraction of SO 3 in the equilibrium mixture is A C Page 4
4 Q5.This question relates to the equilibrium gas-phase synthesis of sulphur trioxide: 2SO 2(g) + O 2(g) 2SO 3(g) Thermodynamic data for the components of this equilibrium are: SO 3(g) SO 2(g) O 2(g) This equilibrium, at a temperature of 585 K and a total pressure of 540 kpa, occurs in a vessel of volume 1.80 dm 3. At equilibrium, the vessel contains mol of SO 2(g), mol of O 2(g) and mol of SO 3(g). With pressures expressed in MPa units, the value of the equilibrium constant, K p, is A C Page 5
5 Q6.This question relates to the equilibrium gas-phase synthesis of sulphur trioxide: 2SO 2(g) + O 2(g) 2SO 3(g) Thermodynamic data for the components of this equilibrium are: SO 3(g) SO 2(g) O 2(g) This equilibrium, at a temperature of 585 K and a total pressure of 540 kpa, occurs in a vessel of volume 1.80 dm 3. At equilibrium, the vessel contains mol of SO 2(g), mol of O 2(g) and mol of SO 3(g). Possible units for the equilibrium constant K p include A C no units kpa Mpa 1 kpa 2 Page 6
6 Q7.This question relates to the equilibrium gas-phase synthesis of sulphur trioxide: 2SO 2(g) + O 2(g) 2SO 3(g) Thermodynamic data for the components of this equilibrium are: SO 3(g) SO 2(g) O 2(g) This equilibrium, at a temperature of 585 K and a total pressure of 540 kpa, occurs in a vessel of volume 1.80 dm 3. At equilibrium, the vessel contains mol of SO 2(g), mol of O 2(g) and mol of SO 3(g). At equilibrium in the same vessel of volume 1.80 dm 3 under altered conditions, the reaction mixture contains mol of SO 3(g), mol of SO 2(g) and mol of O 2(g) at a total pressure of 623 kpa. The temperature in the equilibrium vessel is A 307 C 596 K C 337 C 642 K Page 7
7 Q8.The following information concerns the equilibrium gas-phase synthesis of methanol. CO(g) + 2H 2(g) CH 3OH(g) At equilibrium, when the temperature is 68 C, the total pressure is 1.70 MPa. The number of moles of CO, H 2 and CH 3OH present are 0.160, and 0.180, respectively. Thermodynamic data are given below. CO(g) H 2(g) CH 3OH(g) Possible units for the equilibrium constant, K p, for this reaction are A C no units kpa MPa 1 kpa 2 Page 8
8 Q9.The following information concerns the equilibrium gas-phase synthesis of methanol. CO(g) + 2H 2(g) CH 3OH(g) At equilibrium, when the temperature is 68 C, the total pressure is 1.70 MPa. The number of moles of CO, H 2 and CH 3OH present are 0.160, and 0.180, respectively. Thermodynamic data are given below. CO(g) H 2(g) CH 3OH(g) The mole fraction of hydrogen in the equilibrium mixture is A C Page 9
9 Q10.The following information concerns the equilibrium gas-phase synthesis of methanol. CO(g) + 2H 2(g) CH 3OH(g) At equilibrium, when the temperature is 68 C, the total pressure is 1.70 MPa. The number of moles of CO, H 2 and CH 3OH present are 0.160, and 0.180, respectively. Thermodynamic data are given below. CO(g) H 2(g) CH 3OH(g) With pressures expressed in MPa units, the value of the equilibrium constant, K p, under these conditions is A C Page 10
10 Q11.The following information concerns the equilibrium gas-phase synthesis of methanol. CO(g) + 2H 2(g) CH3OH(g) At equilibrium, when the temperature is 68 C, the total pressure is 1.70 MPa. The number of moles of CO, H 2 and CH 3OH present are 0.160, and 0.180, respectively. Thermodynamic data are given below. CO(g) H 2(g) CH 3OH(g) Which one of the following statements applies to this equilibrium? A C The value of K p increases if the temperature is raised. The value of K p increases if the pressure is raised. The yield of methanol decreases if the temperature is lowered. The yield of methanol decreases if the pressure is lowered. Page 11
The partial pressure of sulphur dioxide in the equilibrium mixture was 24 kpa and the total pressure in the flask was 104 kpa.
Q1. Sulphur dioxide and oxygen were mixed in a 2:1 mol ratio and sealed in a flask with a catalyst. The following equilibrium was established at temperature T 1 2SO 2(g) + O 2(g) 2SO 3(g) ΔH = 196 kj mol
More informationand mol of Cl 2 was heated in a vessel of fixed volume to a constant temperature, the following reaction reached equilibrium.
Q1. When a mixture of 0.45 mol of PCl and 0.68 mol of Cl was heated in a vessel of fixed volume to a constant temperature, the following reaction reached equilibrium. PCl + Cl PCl 5 H = 9 kj mol 1 At equilibrium,
More informationD A(g) + B(g) C(g) endothermic (Total 1 mark) [Cu(H 2O) 6] H 2NCH 2CH 2NH 2 [Cu(H 2NCH 2CH 2NH 2) 2(H 2O) 2] H 2O (Total 1 mark)
Q1.Which one of the equations below represents a reaction that is feasible at all temperatures? P(s) Q(s) + R(g) endothermic 2L(g) + M(g) 2N(g) exothermic S(g) 2T(g) exothermic (g) + (g) (g) endothermic
More informationUse the data in the table to calculate the standard enthalpy of formation of liquid methylbenzene, C 7 H 8. Substance C(s) H 2 (g) C 7 H 8 (l)
Q1.(a) Define the term standard enthalpy of formation, H f ο (3) (b) Use the data in the table to calculate the standard enthalpy of formation of liquid methylbenzene, C 7 H 8 Substance C(s) H 2 (g) C
More informationBond C=O C H C O O H. Use the enthalpy change for the reaction and data from the table to calculate a value for the H H bond enthalpy.
Many chemical processes release waste products into the atmosphere. Scientists are developing new solid catalysts to convert more efficiently these emissions into useful products, such as fuels. One example
More information4 Energetics Exam-style questions. AQA Chemistry
1 Amended from AQA Chemistry Unit 2 Chemistry in Action CHEM2 January 2011 (Question 9) a A student carried out a laboratory experiment to determine the enthalpy change when a sample of butan-1-ol was
More informationMagnesium nitride reacts with water to form magnesium hydroxide and ammonia.
Q1. (a) A sample of ethanol vapour, C 2H 5OH (M r = 46.0), was maintained at a pressure of 100 kpa and at a temperature of 366K. (i) State the ideal gas equation. (ii) Use the ideal gas equation to calculate
More informationAS Paper 1 and 2 Kc and Equilibria
AS Paper 1 and 2 Kc and Equilibria Q1.When one mole of ammonia is heated to a given temperature, 50 per cent of the compound dissociates and the following equilibrium is established. NH 3(g) ½ N 2 (g)
More informationF325: Equilibria, Energetics and Elements How Far?
F325: Equilibria, Energetics and Elements 5.1.2 How Far? 100 marks 1. Syngas is a mixture of carbon monoxide and hydrogen gases, used as a feedstock for the manufacture of methanol. A dynamic equilibrium
More informationChem 1B Dr. White 1 Chapter 17: Thermodynamics. Review From Chem 1A (Chapter 6, section 1) A. The First Law of Thermodynamics
Chem 1B Dr. White 1 Chapter 17: Thermodynamics Review From Chem 1A (Chapter 6, section 1) A. The First Law of Thermodynamics 17.1 Spontaneous Processes and Entropy A. Spontaneous Change Chem 1B Dr. White
More informationAQA A2 CHEMISTRY TOPIC 4.2 EQUILIBRIA BOOKLET OF PAST EXAMINATION QUESTIONS
AQA A2 CHEMISTRY TOPIC 4.2 EQUILIBRIA BOOKLET OF PAST EXAMINATION QUESTIONS 1 1. (a) The diagram below shows the effect of temperature and pressure on the equilibrium yield of the product in a gaseous
More information(g) + 2H 2. (g) CH [1] (g) H 2. Explain, with a calculation, whether this reaction is feasible at 25 C [3]
1 This question looks at two reactions involving sulfur compounds (a) Hydrogen reacts with carbon disulfide as shown below 4H 2 + CS 2 CH 4 + 2H 2 S For this reaction, ΔH = 234 kj mol 1 and ΔS = 164 J
More informationAS Paper 1 and 2 Energetics
AS Paper 1 and 2 Energetics Q1.Nitric acid is produced industrially from ammonia, air and water using the following sequence of reactions: 4NH 3 (g) + 5O 2(g) 4NO(g) + 6H 2O(g) H = 909 kj mol 1 (2) 2NO(g)
More information10 Enthalpy changes Answers to Activity and Practice questions
Page 150 151 Activity: Measuring the enthalpy change for the reaction of zinc with copper sulfate solution 1 The graph should have: axes with scales and labels points plotted accurately a clean, smooth
More informationAQA A2 CHEMISTRY TOPIC 5.1 THERMODYNAMICS BOOKLET OF PAST EXAMINATION QUESTIONS
AQA A2 CHEMISTRY TOPIC 5.1 THERMODYNAMICS BOOKLET OF PAST EXAMINATION QUESTIONS 1 1. A Born Haber cycle for the formation of calcium sulphide is shown below. The cycle includes enthalpy changes for all
More informationChemistry in society. Homework
hemistry in society Homework Equilibrium, Hess Law, Enthalpy 1 Multiple choice 10 marks 1) l 2 (g) + H 2 O(l) l - (aq) + lo - (aq) + 2H + (aq) The addition of which substance would move the above equilibrium
More information(03) WMP/Jun10/CHEM4
Thermodynamics 3 Section A Answer all questions in the spaces provided. 1 A reaction mechanism is a series of steps by which an overall reaction may proceed. The reactions occurring in these steps may
More informationThe change in enthalpy accompanying many reactions can be experimentally measured using calorimetry.
1. Hess s Law Students: investigate Hess s Law in quantifying the enthalpy change for a stepped reaction using standard enthalpy change data and bond energy data, for example: - carbon reacting with oxygen
More informationNH 3(g) N 2(g) + H 2(g) What is the total number of moles of gas present in this equilibrium mixture? D 3.0 (Total 1 mark)
Q1.When one mole of ammonia is heated to a given temperature, 50% of the compound dissociates and the following equilibrium is established. NH 3(g) N 2(g) + H 2(g) What is the total number of moles of
More information(02) WMP/Jun10/CHEM2
Energetics 2 Section A Answer all the questions in the spaces provided. 1 An equation for the equilibrium reaction between hydrogen, iodine and hydrogen iodide is shown below. H 2 (g) + I 2 (g) 2HI(g)
More information3.2.1 Energetics. Calorimetry. 121 minutes. 120 marks. Page 1 of 19
3..1 Energetics Calorimetry 11 minutes 10 marks Page 1 of 19 Q1. A 50.0 cm 3 sample of a 0.00 mol dm 3 solution of silver nitrate was placed in a polystyrene beaker. An excess of powdered zinc was added
More information3.2.2 Kinetics. Effect of temperature. 145 minutes. 145 marks. Page 1 of 22
3.. Kinetics Effect of temperature 145 minutes 145 marks Page 1 of Q1. (a) State what is meant by the term activation energy of a reaction. (b) (c) State in general terms how a catalyst increases the rate
More informationChemistry 123: Physical and Organic Chemistry Topic 4: Gaseous Equilibrium
Topic 4: Introduction, Topic 4: Gaseous Equilibrium Text: Chapter 6 & 15 4.0 Brief review of Kinetic theory of gasses (Chapter 6) 4.1 Concept of dynamic equilibrium 4.2 General form & properties of equilbrium
More informationQ1. (a) Explain the meaning of the terms mean bond enthalpy and standard enthalpy of formation. Mean bond enthalpy
Q1. (a) Explain the meaning of the terms mean bond enthalpy and standard enthalpy of formation. Mean bond enthalpy......... Standard enthalpy of formation............ (5) (b) Some mean bond enthalpies
More informationPropanone can be formed when glucose comes into contact with bacteria in the absence of air. Deduce the role of the bacteria in this reaction.
Q1.(a) Propanone can be formed when glucose comes into contact with bacteria in the absence of air. Balance the following equation for this reaction of glucose to form propanone, carbon dioxide and water....c
More informationWhich line represents the volume of hydrogen formed, at the same temperature and pressure, when the concentration of sulfuric acid has been halved?
1 Line X in the diagram represents the volume (V) of gas formed with time (t) in a reaction between an excess of magnesium and aqueous sulfuric acid. Which line represents the volume of hydrogen formed,
More informationEntropy. Spontaneity. Entropy. Entropy mol of N 2 at 1 atm or 1 mol of N 2 at atm. process a process that occurs without intervention
Entropy Spontaneity process a process that occurs without intervention can be fast or slow Entropy (s) the measure of molecular randomness or disorder Think of entropy as the amount of chaos Entropy Predict
More informationName Chemistry Exam #8 Period: Unit 8: Kinetics, Thermodynamics, & Equilibrium
1. Which quantities must be equal for a chemical reaction at equilibrium? (A) the potential energies of the reactants and products (B) the concentrations of the reactants and products (C) the activation
More informationWrite a balanced equation for the thermal decomposition of calcium nitrate. ... (2)
1. (a) When solid calcium nitrate is heated, brown fumes of nitrogen dioxide, NO 2, are seen and the solid remaining after decomposition is calcium oxide. Write a balanced equation for the thermal decomposition
More information1. The reaction between sulphur dioxide and oxygen is a dynamic equilibrium (2)
1. The reaction between sulphur dioxide and oxygen is a dynamic equilibrium. SO + O SO 3 H = 196 kjmol 1 (a) Explain what is meant by dynamic equilibrium.......... () (b) In the table below state the effect
More information2012 AP CHEMISTRY FREE-RESPONSE QUESTIONS
01 AP CHEMISTRY FREE-RESPONSE QUESTIONS. A sample of a pure, gaseous hydrocarbon is introduced into a previously evacuated rigid 1.00 L vessel. The pressure of the gas is 0.00 atm at a temperature of 17C.
More informationQ.1 Write out equations for the reactions between...
1 CHEMICAL EQUILIBRIUM Dynamic Equilibrium not all reactions proceed to completion some end up with a mixture of reactants and products this is because some reactions are reversible; products revert to
More information3.2.1 Energetics. Enthalpy Change. 263 minutes. 259 marks. Page 1 of 41
..1 Energetics Enthalpy Change 6 minutes 59 marks Page 1 of 41 Q1. (a) Define the term standard molar enthalpy of formation, ΔH f. (b) State Hess s law. (c) Propanone, CO, burns in oxygen as shown by the
More informationMass of g measured with a balance with an uncertainty of ±0.001 g.
Q1.Which of these pieces of apparatus has the lowest percentage uncertainty in the measurement shown? Volume of 25 cm 3 measured with a burette with an uncertainty of ±0.1 cm 3. Volume of 25 cm 3 measured
More information(b) Describe, and explain, what would happen to the position of the NO 2 /N 2 O 4 equilibrium if the following changes are made
1. Nitrogen dioxide, NO 2, and dinitrogen tetroxide, N 2 O 4, take part in the following equilibrium. 2NO 2 (g) N 2 O 4 (g) ΔH = 58 kj mol 1 (a) State le Chatelier s principle. (b) Describe, and explain,
More informationThermochemistry. Chapter 6. Concept Check 6.1. Concept Check 6.2. Solution
Chapter 6 Thermochemistry Concept Check 6.1 A solar-powered water pump has photovoltaic cells on protruding top panels. These cells collect energy from sunlight, storing it momentarily in a battery, which
More informationWINTER-15 EXAMINATION Model Answer
Subject code :(735) Page of 9 Important Instructions to examiners: ) The answers should be examined by key words and not as word-to-word as given in the model answer scheme. ) The model answer and the
More informationNo Brain Too Small CHEMISTRY AS91390 Demonstrate understanding of thermochemical principles and the properties of particles and substances
COLLATED QUESTIONS Hess s Law including application of ΔrH = Σ fh((products) Σ fh(reactants)) and related calculations. 2018:2 (i) The equation for the combustion of propan-1-ol is: C3H7OH(l) + 4.5O2(g)
More informationChemical Equilibrium. Professor Bice Martincigh. Equilibrium
Chemical Equilibrium by Professor Bice Martincigh Equilibrium involves reversible reactions Some reactions appear to go only in one direction are said to go to completion. indicated by All reactions are
More informationWorksheet 5.2. Chapter 5: Energetics fast facts
Worksheet 52 Chapter 5: Energetics fast facts 51 Exothermic and endothermic reactions Energetics deals with heat changes in chemical reactions Enthalpy is the amount of heat energy contained in a substance
More informationThe table below includes some values of standard enthalpies of formation ( H ).
1. A vessel and its contents of total heat capacity 120 J K 1 were heated using a methane burner. Calculate the maximum theoretical temperature rise when 0.10 g of methane was completely burned. The standard
More informationCalculations Involving the Equilibrium Constant K eq )
Calculations Involving the Equilibrium Constant K eq ) 1. Given the equilibrium equation below: A 2(g) + B 2(g) 2AB (g) If, at equilibrium, the concentrations are as follows: [A 2 ] = 3.45 M, [B 2 ] =
More informationKinetics & Equilibrium Review Packet. Standard Level. 1. Which quantities in the enthalpy level diagram are altered by the use of a catalyst?
Kinetics & Equilibrium Review Packet Standard Level 1. Which quantities in the enthalpy level diagram are altered by the use of a catalyst? Enthalpy I II III Time A. I and II only B. I and III only C.
More information5.1 Exothermic and endothermic reactions
Topic 5: Energetics 5.1 Exothermic and endothermic reactions Chemical reactions involve the breaking and making of bonds. Breaking bonds requires energy,whereas energy is given out when new bonds are formed.
More information2/18/2013. Spontaneity, Entropy & Free Energy Chapter 16. The Dependence of Free Energy on Pressure Sample Exercises
Spontaneity, Entropy & Free Energy Chapter 16 16.7 The Dependence of Free Energy on Pressure Why is free energy dependent on pressure? Isn t H, enthalpy independent of pressure at constant pressure? No
More information1.23 Gas Calculations
1.23 Gas Calculations Gas calculations at A-level are done in two different ways although both link the volumes of a gas to the amount in moles of the gas. The same amount in moles of any gas will have
More informationEquilibrium Written Response
Equilibrium Written Response January 1998 2. Consider the following equilibrium: CS2 (g) + 3Cl2 (g) CCl4 (g) + S2Cl2 (g) ΔH = -238 kj a) Sketch a potential energy diagram for the reaction above and label
More informationContents. Content Guidance. Questions & Answers. Getting the most from this book... 4 About this book... 5
Contents Getting the most from this book... 4 About this book.... 5 Content Guidance Atomic structure......................................... 6 Amount of substance....................................
More informationDraw the structure of the alkene that would form 1,2-dibromo-3-methylbutane when reacted with bromine.
Q1.In each of the following questions, you should draw the structure of the compound in the space provided. (a) Draw the structure of the alkene that would form 1,2-dibromo-3-methylbutane when reacted
More informationThe table shows three possible reversible reactions that he could use. The enthalpy changes are also shown. O(g) CO 2. (g) + 4H 2.
1 A manufacturer investigates some reactions that produce hydrogen. The table shows three possible reversible reactions that he could use. The enthalpy changes are also shown. Reaction Equation H in kj/mol
More informationA-level CHEMISTRY (7405/1)
SPECIMEN MATERIAL A-level CHEMISTRY (7405/1) Paper 1: Inorganic and Physical Chemistry Specimen 2015 Session Time allowed: 2 hours Materials For this paper you must have: the Data Booklet, provided as
More informationSection 7.2: Equilibrium Law and the Equilibrium Constant Tutorial 1 Practice, page (a) 2 CO 2 (g) #!!"
Section 7.: Equilibrium Law and the Equilibrium Constant Tutorial Practice, page 4. (a) CO (g) #!!"! CO(g) + O (g) Products: CO(g); O (g) Reactant: CO (g) [CO [O Equilibrium law equation: [CO (b) Cl (g)
More informationA-level CHEMISTRY (7405/1)
A-level CHEMISTRY (7405/) Paper : Inorganic and Physical Chemistry Mark scheme Specimen paper MARK SCHEME A-LEVEL CHEMISTRY 7405/ - SPECIMEN Mark schemes are prepared by the Lead Assessment Writer and
More informationA. 2.5 B. 5.0 C. 10. D. 20 (Total 1 mark) 2. Consider the following reactions. N 2 (g) + O 2 (g) 2NO(g) 2NO 2 (g) 2NO(g) + O 2 (g)
1. When 100 cm 3 of 1.0 mol dm 3 HCl is mixed with 100 cm 3 of 1.0 mol dm 3 NaOH, the temperature of the resulting solution increases by 5.0 C. What will be the temperature change, in C, when 50 cm 3 of
More informationChemical Equilibrium: Ch Dynamic Equilibrium. Dynamic Equilibrium. Three Approaches to Equilibrium The Equilibrium Constant Expression
Chemical Equilibrium: Ch. 15 15-1 Dynamic Equilibrium 15- The Equilibrium Constant Expression 15- Relationships Involving Equilibrium Constants 15-4 The Magnitude of an Equilibrium Constant 15-5 The Reaction
More informationLesmahagow High School
Lesmahagow High School Chemistry Advanced Higher Unit 1 Physical Chemistry TUTORIAL EXERCISES 1. Consider the equilibrium below: Unit 1 Physical Chemistry Tutorial 1.1 The Equilibrium Constant The equilibrium
More information1. (a) The propane gas in the tank is used as a fuel in the factory. The equation for its combustion is:
Enthalpy 1. (a) The propane gas in the tank is used as a fuel in the factory. The equation for its combustion is: C 3 H 8 (g) + 5O 2 (g) 3CO 2 (g) + 4H 2 O(l) H = 2220 kj mol 1 Calculate the amount of
More informationF322: Chains, Energy and Resources Rates and Equilibria
F322: Chains, Energy and Resources 2.3.2 Rates and Equilibria 1. Dilute aqueous hydrogen peroxide, H 2 O 2 (aq), is used to sterilise contact lenses. Dilute H 2 O 2 (aq) slowly decomposes at room temperature
More informationThermodynamics I. Prep Session
Thermodynamics I Prep Session Dr. John I. Gelder Department of Chemistry Oklahoma State University Stillwater, OK 74078 john.gelder@okstate.edu http://intro.chem.okstate.edu 12/5/09 1 Thermo I Prep Session
More informationChapter 15 Equilibrium
Chapter 15. Chemical Equilibrium Sample Exercise 15.1 (p. 632) Write the equilibrium expression for K eq for these three reactions: a) 2 O 3(g) 3 O 2(g) b) 2 NO (g) + Cl 2(g) 2 NOCl (g) c) Ag + (aq) +
More informationAdditional Calculations: 10. How many joules are required to change the temperature of 80.0 g of water from 23.3 C to 38.8 C?
Additional Calculations: 10. How many joules are required to change the temperature of 80.0 g of water from 23.3 C to 38.8 C? q = m C T 80 g (4.18 J/gC)(38.8-23.3C) = 5183 J 11. A piece of metal weighing
More informationIn the first stage, carbon monoxide and hydrogen are formed. The equation for this reaction is. Temperature... Explanation
Q1.Hydrogen is produced in industry from methane and steam in a two-stage process. (a) In the first stage, carbon monoxide and hydrogen are formed. The equation for this reaction is CH 4 (g) + H 2 O(g)
More informationSo by applying Hess s law a = ΔH + b And rearranged ΔH = a - b
3.12 Hess s Law Hess s law states that total enthalpy change for a reaction is independent of the route by which the chemical change takes place Hess s law is a version of the first law of thermodynamics,
More information1. The reaction between solid barium hydroxide and solid ammonium chloride can be represented by the equation below.
1. The reaction between solid barium hydroxide and solid ammonium chloride can be represented by the equation below. Ba(OH) 2 (s) + 2NH 4 Cl(s) BaCl 2 (s) + 2NH 3 (g) + 2H 2 O(l) ΔH ο = +51.1 kj mol 1
More information1.4 Enthalpy. What is chemical energy?
1.4 Enthalpy What is chemical energy? Chemical energy is a form of potential energy which is stored in chemical bonds. Chemical bonds are the attractive forces that bind atoms together. As a reaction takes
More informationevidyarthi.in Thermodynamics Q 1.
SUBJECTIVE PROBLEMS: Q 1. Thermodynamics The enthalpy for the following reaction ( H o ) at 25 o C are given below: (i) 1/2 H 2 (g) + 1/2 O 2 (g) OH(g) 10.06 kcal (ii) H 2 (g) 2H(g) 104.18 kcal (iii) O
More informationSection 9: Thermodynamics and Energy
Section 9: Thermodynamics and Energy The following maps the videos in this section to the Texas Essential Knowledge and Skills for Science TAC 112.35(c). 9.01 Law of Conservation of Energy Chemistry (11)(A)
More informationName Date IB Chemistry HL-II Summer Review Unit 1 Atomic Structure IB 2.1 The nuclear atom
Name Date IB Chemistry HL-II Summer Review Unit 1 Atomic Structure IB.1 The nuclear atom 1. State the number of protons, neutrons, and electrons in each of the following: a. 65 Cu b. 15 N 3- c. 137 Ba
More informationFor more info visit
Basic Terminology: Terms System Open System Closed System Isolated system Surroundings Boundary State variables State Functions Intensive properties Extensive properties Process Isothermal process Isobaric
More informationK P VERSUS K C PROPERTIES OF THE EQUILIBRIUM CONSTANT
K P VERSUS K C 1. What are the units of K p and K c for each of the following? a) 2H 2 S(g) 2H 2 (g) + S 2 (g) b) 4NH 3 (g) + 3O 2 (g) 2N 2 (g) + 6H 2 O(g) 2. What are the units of K p and K c for each
More informationAP* Thermodynamics Free Response Questions page 1. Essay Questions
AP* Thermodynamics Free Response Questions page 1 Essay Questions 1991 The reaction represented above is a reversible reaction. BCl 3 (g) + NH 3 (g) Cl 3 BNH 3 (s) (a) Predict the sign of the entropy change,
More informationName AP CHEM / / Collected AP Exam Essay Answers for Chapter 16
Name AP CHEM / / Collected AP Exam Essay Answers for Chapter 16 1980 - #7 (a) State the physical significance of entropy. Entropy (S) is a measure of randomness or disorder in a system. (b) From each of
More informationChapter 6 Thermochemistry
Chapter 6 Thermochemistry Contents and Concepts Understanding Heats of Reaction The first part of the chapter lays the groundwork for understanding what we mean by heats of reaction. 1. Energy and Its
More information3.2.1 Energetics. Bond Enthalpy. 98 minutes. 96 marks. Page 1 of 16
3..1 Energetics Bond Enthalpy 98 minutes 96 marks Page 1 of 16 Q1. (a) State what is meant by the term mean bond enthalpy. () (b) Ethanal has the structure Gaseous ethanal burns as shown by the equation
More information(04) WMP/Jan11/CHEM2
Kinetics 4 2 The diagram below shows a Maxwell Boltzmann distribution for a sample of gas at a fixed temperature. E a is the activation energy for the decomposition of this gas. Number of molecules with
More informationUNIVERSITY OF VICTORIA CHEMISTRY 102 Midterm Test 2 March 13, pm (60 minutes) DISPLAY YOUR STUDENT ID CARD (ONECard) ON TOP OF YOUR DESK NOW
Version A UNIVERSITY OF VICTORIA CHEMISTRY 102 Midterm Test 2 March 13, 2015 5-6 pm (60 minutes) Version A DISPLAY YOUR STUDENT ID CARD (ONECard) ON TOP OF YOUR DESK NOW Answer all multiple choice questions
More informationOH, is an important feedstock for the chemical industry.
1 Methanol, CH 3 OH, is an important feedstock for the chemical industry. In the manufacture of methanol, carbon dioxide and hydrogen are reacted together in the reversible reaction shown below. CO 2 (g)
More informationSections A. Hess s Law Grade 12. Energetics. Instructions: Please complete questions: 1-9 for homework
Hess s Law Grade 2 Energetics Instructions: Please complete questions: - 9 for homework Sections A. The H Ө values for the formation of two oxides of nitrogen are given below. 2 N 2 (g) + O 2 (g) NO 2
More informationExam 4, Ch 14 and 15 December 7, Points
Chem 130 Name Exam 4, Ch 14 and 15 December 7, 2016 100 Points Please follow the instructions for each section of the exam. Show your work on all mathematical problems. Provide answers with the correct
More informationThe Equilibrium Law. Calculating Equilibrium Constants. then (at constant temperature) [C] c. [D] d = a constant, ( K c )
Chemical Equilibrium 1 The Equilibrium Law States If the concentrations of all the substances present at equilibrium are raised to the power of the number of moles they appear in the equation, the product
More informationA proposed mechanism for the decomposition of hydrogen peroxide by iodide ion is: slow fast (D) H 2 O
Chemistry 112, Spring 2007 Prof. Metz Exam 2 Practice Use the following information to answer questions 1 through 3 A proposed mechanism for the decomposition of hydrogen peroxide by iodide ion is: H 2
More informationTHERMODYNAMICS. Energy can be neither created nor destroyed but it can be converted from one form to another.
Chemical Energetics 1 TERMODYNAMICS First Law Energy can be neither created nor destroyed but it can be converted from one form to another. all chemical reactions are accompanied by some form of energy
More information2 Answer all the questions. 1 This question refers to chemistry of d-block elements in Period 4 (Sc Zn).
2 Answer all the questions. 1 This question refers to chemistry of d-block elements in Period 4 (Sc Zn). (a) For each statement below, select the symbols of the correct element(s). The element that has
More informationUNIVERSITY OF SIERRA LEONE FOURAH BAY COLLEGE. FIRST EXAMINATION FOR THE DEGREE OF B. Sc. HONOURS LEVEL I SECOND SEMESTER EXAMINATION
UNIVERSITY OF SIERRA LEONE FOURAH BAY COLLEGE CHEM 121 INSTRUCTIONS: FIRST EXAMINATION FOR THE DEGREE OF B. Sc. HONOURS LEVEL I SECOND SEMESTER EXAMINATION WEDNESDAY 12 th SEPTEMBER 2018 13.30 16.45 CHEM
More informationSection 1 - Thermochemistry
Reaction Energy Section 1 - Thermochemistry Virtually every chemical reaction is accompanied by a change in energy. Chemical reactions usually absorb or release energy as heat. You learned in Chapter 12
More informationKinetic energy is the energy of motion (of particles). Potential energy involves stored energy (energy locked up in chemical bonds)
Enthalpy (H) Enthalpy (H) is the total energy amount (Epotential + Ekinetic) of a system during a chemical reaction under constant temperature and pressure conditions. Kinetic energy is the energy of motion
More informationThermochemistry: the study of energy (in the from of heat) changes that accompany physical & chemical changes
Thermochemistry Thermochemistry: the study of energy (in the from of heat) changes that accompany physical & chemical changes heat flows from high to low (hot cool) endothermic reactions: absorb energy
More informationUNIT ONE BOOKLET 6. Thermodynamic
DUNCANRIG SECONDARY ADVANCED HIGHER CHEMISTRY UNIT ONE BOOKLET 6 Thermodynamic Can we predict if a reaction will occur? What determines whether a reaction will be feasible or not? This is a question that
More informationUnit 2 Pre-Test Reaction Equilibrium
Unit 2 Pre-Test Reaction Equilibrium Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Consider the following equilibrium system: 2HF(g) F 2(g) + H 2 (g)
More informationAmounts of substances can be described in different ways. One mole of a substance is the relative formula mass in ...
Q1.This question is about atoms and isotopes. (a) Atoms contain protons, neutrons and electrons. A lithium atom has the symbol Explain, in terms of sub-atomic particles, why the mass number of this lithium
More information(b) Increase in pressure. (1)
1 This question is about the equilibrium reaction between hydrogen and carbon dioxide. H 2 (g) + O 2 (g) H 2 O(g) + O(g) H = +40 kj mol 1 What effect would the following changes have on the rate of reaction
More informationKc is calculated for homogeneous reactions using the concentrations of the reactants and products at equilibrium:
Chemical Equilibrium Dynamic Equilibrium A dynamic equilibrium exists in a closed system when the rate of the forward reaction is equal to the rate of the reverse reaction. When a dynamic equilibrium is
More informationThermodynamics: Study of heat and its relationship with other forms of energy
Unit 6 The 6 th planet in our solar system is Saturn Ch. 5: Thermodynamics: Study of heat and its relationship with other forms of energy Two types of energy: Kinetic: movement, active energy Potential:
More informationQUESTIONSHEETS ENERGETICS I ENTHALPY OF DISPLACEMENT BOND DISSOCIATION ENTHALPY HESS S LAW AND ENTHALPY DIAGRAMS HESS S LAW WITH CALORIMETRY
CHEMISTRY QUESTIONSHEETS AS Level AS TOPIC 5 ENERGETICS I Questionsheet 1 Questionsheet 2 Questionsheet 3 Questionsheet 4 Questionsheet 5 Questionsheet 6 Questionsheet 7 Questionsheet 8 Questionsheet 9
More informationLECTURE 9: Chemical Equilibrium
LECTURE 9: Chemical Equilibrium REACTION GIBBS ENERGY Consider the simple reaction A B» Examples d-alanine to l- alanine» Suppose an infintesimal amount of n A converts to n B, then dn A =-dn B» If we
More information91166 Demonstrate understanding of chemical reactivity Collated questions on equilibria
(2017:2) 91166 Demonstrate understanding of chemical reactivity Collated questions on equilibria The addition of a small amount of iron to a mixture of nitrogen and hydrogen gases helps to speed up the
More informationQ1. (a) State what is meant by the term activation energy of a reaction. (1)
Q1. (a) State what is meant by the term activation energy of a reaction. (c) State in general terms how a catalyst increases the rate of a chemical reaction. The curve below shows the Maxwell Boltzmann
More informationUNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certifi cate of Education Advanced Subsidiary Level and Advanced Level
*9395074405* UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certifi cate of Education Advanced Subsidiary Level and Advanced Level CHEMISTRY 9701/23 Paper 2 Structured Questions AS Core May/June
More informationa) Write the expression for the equilibrium constant, K eq
Chemistry 12 K eq Calculations Worksheet Name: Date: Block: 1. Given the equilibrium equation below: A 2(g) + B 2(g) 2AB (g) If, at equilibrium, the concentrations are as follows: [A 2] = 3.45 M, [B 2]
More informationHOMEWORK 11-1 (pp )
CHAPTER 11 HOMEWORK 11-1 (pp. 333 335) VOCABULARY Define. 1. Gay-Lussac s law of combining volumes of gases 2. Avogadro s law Answer each question. 3. Write and explain the equation that expresses the
More information