International Maritime Equilibrium and Le Chateliers Principle Worksheet

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FINAL ASSESSMENT 2019 – 2020 Program Year Semester Paper PE 1 1 MAIN MODULE NAME: MODULE CODE: TEACHER’S NAME: Questions to be answered on: Space provided on the question paper ENGINEERING CHEMISTRY TCE SUBMISSTION DATE: MUNA DURATION: Allowed requirements Pen, Pencil, Calculator, Personal Computer, Mobile Devices 7-8/06/2020 48 Hrs Number of pages (Incl. Cover Page): … Points of Attention: • • • • • • • • • • For each question, the maximum earned points are mentioned between brackets at the end of each question. Write very clearly! Answers that are not readable are not marked and don’t get points! Make sure your answers are written to the point. All answers should be written in English. Write all the answers in blue or black pen only (NO pencil). Answers can also be typed in MS Word using proper formatting instruction provided in the question paper. Answer written in Pencil will not be marked. Use pencil or Computer graphics only for diagrams, graphs & drawing. Show all the calculation steps in the given space. When finished, submit the question paper, together with the answer scripts and the signed cover page to the teacher through the Moodle. • All answer scripts must be submitted along with Academic Integrity form. • Any cheating/copying may result in an instant failing of the examination. FINAL MARKS STUDENT NAME: 50 STUDENT ID: 10 Number of answer scripts: ……………………… Teacher: ………….……........... Student’s signature: ……………………………… Time of receipt: ……………........ PE –Year1–FINAL ASSESSMENT MAIN –TEC–AY2019-2020 Page | 1 DECLARATION OF ACADEMIC INTEGRITY Form Title Department Form Code Issue Date Declaration of Academic Integrity Academic Departments IMCO/QMS/AD/FORM 17/01/2016 Please sign to confirm that you have read and accepted the following statements. Your assessment will not be accepted without this signed declaration. 1. I confirm that I have read and fully understood IMCO’s policy on Academic Integrity, including practices that may lead to committing plagiarism and which I must avoid. 2. I confirm that in the attached assessment I have not presented or attempted to present anyone else’s work as my own, except where I have indicated. I confirm that I understand that doing so would mean I had committed plagiarism. 3. I confirm that I understand that, if I fail to comply with IMCO’s policy on Academic Integrity, IMCO will impose penalties which may in the most serious of cases result in termination of my studies at IMCO. I confirm that I understand that if I am judged guilty of plagiarism I will receive a score of zero and the other penalties indicated under IMCO’s policy on Academic Integrity in the Student’s Handbook will apply. 4. I agree to IMCO submitting my work to Turn-it-in or using any other source to verify whether my work contains plagiarised material. The extent to which I have worked with others is as follows: Programme: …………………………………………………………. Module Code: …………………………………………...................... Module Title: ………………………………………………………... Name: ………………………………………………………………… IMCO student ID number: ……………………………. Class: ……………………………………………………. Signature ……………………………………………….. Date: ………………… See the Student Handbook for IMCO’s policy on Academic Integrity and Plagiarism before you sign. PE –Year1–FINAL ASSESSMENT MAIN –TEC–AY2019-2020 Page | 2 SECTION- A Answer all of the following questions Q1. A metal ball with weight 110.0 g, originally at 90 °C, is dropped into 130 g of water originally at 23 °C. The final temperature of both the metal ball and the water is 30 °C. Calculate the heat capacity and specific heat of the metal ball. [5 Marks] Data: Specific heat of water is 4.184 J/g°C Q2. A fertilizer company produces ammonia on a large scale at a temperature of 450 °C. The balanced equation below represents the reaction that takes place in a sealed container. N2(g) + 3H2(g) ⇌ 2NH3(g) ΔH < 0 To meet an increased demand for fertilizer, the management of the company instructs their engineer to make the necessary adjustments to increase the yield of ammonia. In a trial run on a small scale in the laboratory, the engineer makes adjustments to the TEMPERATURE, PRESSURE and CONCENTRATION of the equilibrium mixture. a) 1.Identify the changes made to the equilibrium mixture at each of the following state: [3 Marks] i. Increase temperature ii. Add catalyst iii. Increase pressure b) The engineer now injects 5 mol N2 and 5 mol H2 into a 5 dm3 sealed empty container. Equilibrium is reached at 450 °C. Upon analysis of the equilibrium Mixture, he finds that the mass of NH3 is 20,4 g. [4Marks] Calculate the value of the equilibrium constant (Kc) at 450 °C. PE –Year1–FINAL ASSESSMENT MAIN –TEC–AY2019-2020 Page | 3 Q3. Consider the reaction: P4 + 6 H2 → 4 PH3. A rate study of this reaction was conducted at 298 K. The data that were obtained are shown in the table. [8 Marks] [P4], mol/L 0.0110 [H2], mol/L 0.0075 Initial Rate, mol/(L . s) 0.0110 0.0150 6.40 x 10-4 0.0220 0.0150 6.39 x 10-4 3.20 x 10-4 a. What is the order of P4 and H2? b. Write the rate law? c. Determine the value and units of the rate constant, k Q4. From the following enthalpies of reaction H2(g) + F2(g) → 2HF(g) ΔH = –537 kJ C(s) + 2 F2(g) →CF4(g) ΔH = –680 kJ [4 Marks] 2 C(s) + 2 H2(g)→C2H4(g) ΔH = –52.3 kJ Calculate the ΔH for the reaction of C2H4(g) with F2(g) to make CF4(g) and HF(g) PE –Year1–FINAL ASSESSMENT MAIN –TEC–AY2019-2020 Page | 4 SECTION- B Answer all of the following questions Q5. An ice cube tray contains enough water at 23.0°C to make 18 ice cubes that each have a mass of 33.0 g. The tray is placed in a freezer that uses CF2Cl2 as a refrigerant. The heat of vaporization CF2Cl2 is 158 kJ/g. What mass of CF2Cl2 must be vaporized in the refrigeration cycle to convert all of the water at 23.0°C to ice at ‑6.0°C. [5 Marks] Data: Heat capacity of water: 4.18 J/g°C Heat capacity of ice :2.08 J/g°C Enthalpy of fusion for water: 6.02 kJ/g. Q6. At a particular temperature, 2 NO2 (g) ⇌ N2 (g) + 2 O2 (g) Kc = 2.5 x 10-8 2 NO2 (g) ⇌ 2 NO (g) + O2 (g) Kc = 5.0 x 10-5 Use the above information to calculate the Kc for the reaction below at that temperature. N2 (g) + O2 (g) ⇌ 2 NO (g) Kc =? Q7. Suppose the chemical reaction: [4 Marks] [8 Marks] A(g) → B(g) + C(s) Derive the following by using above reaction. (Show the details) a) Integrated (2 Marks) rate law first order reaction b) The relation between Kp and Kc equation. c) If above reaction is first order reaction ,55%A has reacted after 13.2 hours. equation. (2 Marks) (4 Marks) 1) What is the value of the rate constant in units of h-1? PE –Year1–FINAL ASSESSMENT MAIN –TEC–AY2019-2020 Page | 5 2) How long will it take for 85% of A to react? SECTION- C Answer all of the following questions Q8. A small quantity of cobalt chloride powder is dissolved in ethanol resulting into a blue solution. When few drops of water are carefully added to the blue solution the colour changes to the light pink. The following equilibrium has been established: [CoCl4]2-(aq)(blue) + 6H2O(l) ⇌ [Co(H2O)6]2+(aq)(pink) + 4Cl-(aq) To investigate some of the factors which affect this equilibrium, the following experiments are performed. Experiment 1: A small quantity of concentrated HCl is added to the solution. Observation: The solution turns deep blue Experiment 2: The beaker with the solution is cooled by immersing it in ice water. Observation: The color of the solution changes to pink [3 Marks] a. How was the equilibrium affected in experiment 1? b. Explain you answer in part a. In terms of Le Chatelier’s principle. c. From the results of the experiment 2 determine the sign of ΔH for this reaction. Q9. Lactose, C12H22O11 is a naturally occurring sugar found in mammalian milk. A 0.33M solution of lactose in water has a density of 1.0432g /L at 200C and solution volume is 1 L. what is the concentration of this solution in the following units: [6 Marks] a) Mole fraction b) Mass percent c) Molality PE –Year1–FINAL ASSESSMENT MAIN –TEC–AY2019-2020 Page | 6 Reference: Mc Murry, John E., Fay Robert C. and Robinson Jill K. (2016) “Chemistry, 7th Edition”, USA, Pearson Education, Inc. Virginia Department of Education (2012). The Equilibrium and Le Chatelier’s Principle. Retrieved 2011from
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Explanation & Answer

Attached.

FINAL ASSESSMENT 2019 – 2020
Program

Year

Semester

Paper

PE

1

1

MAIN

MODULE NAME:
MODULE CODE:
TEACHER’S NAME:

Questions to be answered on:
Space provided on the question paper

ENGINEERING CHEMISTRY
TCE

SUBMISSTION
DATE:

MUNA

DURATION:

Allowed requirements
Pen, Pencil, Calculator, Personal
Computer, Mobile Devices

7-8/06/2020
48 Hrs

Number of pages
(Incl. Cover Page): …

Points of Attention:











For each question, the maximum earned points are mentioned between brackets at the end of each question.
Write very clearly! Answers that are not readable are not marked and don’t get points!
Make sure your answers are written to the point.
All answers should be written in English.
Write all the answers in blue or black pen only (NO pencil).
Answers can also be typed in MS Word using proper formatting instruction provided in the question paper.
Answer written in Pencil will not be marked.
Use pencil or Computer graphics only for diagrams, graphs & drawing.
Show all the calculation steps in the given space.
When finished, submit the question paper, together with the answer scripts and the signed cover page to the teacher through
the Moodle.
• All answer scripts must be submitted along with Academic Integrity form.
• Any cheating/copying may result in an instant failing of the examination.

FINAL MARKS

STUDENT NAME:

50

STUDENT ID:

10

Number of answer scripts: ………………………

Teacher: ………….……...........

Student’s signature: ………………………………

Time of receipt: ……………........

PE –Year1–FINAL ASSESSMENT MAIN –TEC–AY2019-2020

Page | 1

DECLARATION OF ACADEMIC INTEGRITY
Form Title
Department
Form Code
Issue Date

Declaration of Academic Integrity
Academic Departments
IMCO/QMS/AD/FORM
17/01/2016

Please sign to confirm that you have read and accepted the following statements. Your assessment
will not be accepted without this signed declaration.
1. I confirm that I have read and fully understood IMCO’s policy on Academic Integrity, including practices that
may lead to committing plagiarism and which I must avoid.
2. I confirm that in the attached assessment I have not presented or attempted to present anyone else’s work as my
own, except where I have indicated. I confirm that I understand that doing so would mean I had committed
plagiarism.
3. I confirm that I understand that, if I fail to comply with IMCO’s policy on Academic Integrity, IMCO will impose
penalties which may in the most serious of cases result in termination of my studies at IMCO. I confirm that I
understand that if I am judged guilty of plagiarism I will receive a score of zero and the other penalties indicated
under IMCO’s policy on Academic Integrity in the Student’s Handbook will apply.
4. I agree to IMCO submitting my work to Turn-it-in or using any other source to verify whether my work contains
plagiarised material.
The extent to which I have worked with others is as follows:

Programme: ………………………………………………………….
Module Code: …………………………………………......................
Module Title: ………………………………………………………...
Name: ...


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