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  • MINISTRY USE ONLY

    Place Personal Education Number (PEN) here.

    2001 Ministry of Education

    MINISTRY USE ONLY

    Place Personal Education Number (PEN) here.

    MINISTRY USE ONLY

    Chemistry 12

    AUGUST 2001

    Course Code = CH

    Student Instructions

    1. Place the stickers with your PersonalEducation Number (PEN) in the allottedspaces above. Under no circumstance isyour name or identification, other thanyour Personal Education Number, toappear on this booklet.

    2. Ensure that in addition to this examinationbooklet, you have a Data Booklet and anExamination Response Form. Follow thedirections on the front of the ResponseForm.

    3. Disqualification from the examination willresult if you bring books, paper, notes orunauthorized electronic devices into theexamination room.

    4. When instructed to open this booklet, checkthe numbering of the pages to ensure thatthey are numbered in sequence from pageone to the last page, which is identified by

    END OF EXAMINATION .

    5. At the end of the examination, place yourResponse Form inside the front cover of thisbooklet and return the booklet and yourResponse Form to the supervisor.

  • Question 1:

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    (4)

    Question 2:

    2. .

    (3)

    Question 3:

    3. .

    (4)

    Question 4:

    4. .

    (3)

    Question 5:

    5. .

    (3)

    Question 6:

    6. .

    (2)

    Question 7:

    7. .

    (4)

    Question 8:

    8. .

    (4)

    Question 9:

    9. .

    (3)

    Question 10:

    10. .

    (6)

    Question 11:

    11. .

    (4)

  • CHEMISTRY 12

    AUGUST 2001

    COURSE CODE = CH

  • GENERAL INSTRUCTIONS

    1. Aside from an approved calculator, electronic devices, including dictionaries andpagers, are not permitted in the examination room.

    2. All multiple-choice answers must be entered on the Response Form using anHB pencil. Multiple-choice answers entered in this examination booklet will notbe marked.

    3. For each of the written-response questions, write your answer in the space providedin this booklet.

    4. Ensure that you use language and content appropriate to the purpose and audienceof this examination. Failure to comply may result in your paper being awarded azero.

    5. This examination is designed to be completed in two hours. Students may,however, take up to 30 minutes of additional time to finish.

  • CHEMISTRY 12 PROVINCIAL EXAMINATION

    ValueSuggested

    Time1. This examination consists of two parts:

    PART A: 48 multiple-choice questions 60 70

    PART B: 11 written-response questions 40 50

    Total: 100 marks 120 minutes

    2. The following tables can be found in the separate Data Booklet.

    Periodic Table of the Elements Atomic Masses of the Elements Names, Formulae, and Charges of Some Common Ions Solubility of Common Compounds in Water Solubility Product Constants at 25 C Relative Strengths of Brnsted-Lowry Acids and Bases Acid-Base Indicators Standard Reduction Potentials of Half-cells

    No other reference materials or tables are allowed.

    3. A calculator is essential for the Chemistry 12 Provincial Examination. Thecalculator must be a hand-held device designed primarily for mathematicalcomputations involving logarithmic and trigonometric functions and may alsoinclude graphing functions. Computers, calculators with a QWERTY keyboard, andelectronic writing pads will not be allowed. Students must not bring any externaldevices to support calculators such as manuals, printed or electronic cards, printers,memory expansion chips or cards, or external keyboards. Students may have morethan one calculator available during the examination. Calculators may not be sharedand must not have the ability to either transmit or receive electronic signals. Inaddition to an approved calculator, students will be allowed to use rulers, compasses,and protractors during the examination.

  • THIS PAGE INTENTIONALLY BLANK

  • OVER- 1 -

    PART A: MULTIPLE CHOICE

    Value: 60 marks Suggested Time: 70 minutes

    INSTRUCTIONS: For each question, select the best answer and record your choice on the ResponseForm provided. Using an HB pencil, completely fill in the circle that has the lettercorresponding to your answer.

    Selected multiple-choice questions are worth 2 marks.

    1. Consider the following reaction: (1 mark)

    N H H O N H O2 4 2 2 2 22 4l l l( ) ( ) ( ) ( )+ +g

    In 5 0. seconds, 0 015. mol of H O2 2 is consumed. The rate of production of N2 is

    A. 1 5 10 3. mol sB. 3 0 10 3. mol sC. 6 0 10 3. mol sD. 1 5 10 2. mol s

    2. Consider the following reaction: (1 mark)

    3 2 462 3 3 4 2Fe O CO Fe O CO kJs g s g( ) ( ) ( ) ( )+ + +

    Which of the following would cause the rate of the reaction to increase?

    A. removing the Fe O3 4B. decreasing the temperatureC. increasing the surface area of Fe O2 3D. increasing the volume of the reaction vessel

    3. Activation energy is described as (1 mark)

    A. the energy of the activated complex.B. a point on the PE diagram where KE PE= .C. the unstable high PE structural arrangement of atoms.D. the minimum PE difference between the activated complex and the reactants.

  • - 2 -

    4. What happens to the activation energy and H whena catalyst is added to a reaction? (2 marks)

    Activation Energy H

    A. increases remains the same

    B. increases increases

    C. decreases remains the same

    D. decreases decreases

    5. Consider the following potential energy diagram for a reaction: (1 mark)

    Progress of the reaction

    PE(kJ)

    60

    120

    180

    240

    30

    90

    150

    210

    What is the value of H for this reaction?

    A. 120 kJB. 30 kJC. +30 kJD. +120 kJ

  • OVER- 3 -

    6. A substance that is produced in one step in a reaction mechanism and consumedin a subsequent step, without appearing in the overall reaction, is a(n) (1 mark)

    A. catalyst.B. product.C. reactant.D. intermediate.

    7. All chemical equilibriums must have (1 mark)

    A. Keq = 1

    B. reactants[ ] = [ ]products .C. rate forward rate reverse= .D. mass of reactants mass of products.=

    8. Consider the following equilibrium reaction: (2 marks)

    4 2 2 111 42 2 2HCl O H O Cl kJg g g g( ) ( ) ( ) ( )+ + + .

    For the forward reaction, how do enthalpy and entropy change?

    Enthalpy Entropy

    A. increases decreases

    B. decreases decreases

    C. increases increases

    D. decreases increases

  • - 4 -

    9. Consider the following equilibrium: (1 mark)

    CH Cl OH CH OH Cl3 3aq aq aq aq( ) ( )

    ( ) ( )+ +

    The equilibrium will shift to the left as a result of the addition of

    A. HNO3

    B. KNO3

    C. NaOH

    D. CH Cl3

    10. Consider the following equilibrium at 25C : (1 mark)

    Ni CO Ni COs g( ) ( ) ( )+ ( )4 4 l

    For this reaction

    A. K COeq = [ ]4

    B. KCOeq

    =[ ]

    14

    C. KNi CO

    CO Nieq=

    ( )[ ][ ] [ ]

    44

    D. KNi CO

    COeq=

    ( )[ ][ ]

    44

  • OVER- 5 -

    11. Consider the following equilibrium: (1 mark)

    2 2 002 2 4COF CO CF Kg g g eq( ) ( ) ( ) + = .

    At equilibrium, CO mol L2 0 050[ ] = . and CF mol L4 0 050[ ] = . .What is COF2[ ] at equilibrium?

    A. 0 0012. mol L

    B. 0 035. mol L

    C. 0 050. mol L

    D. 0 22. mol L

    12. Consider the following equilibrium: (2 marks)

    H O Cl O HOCl K2 2 2 0 0900g g g eq( ) ( ) ( )+ = .

    Initially, a 1 00. L flask is filled with 0 100. mol of H O2 , 0 100 2. mol of Cl Oand 0 100. mol of HOCl. As equilibrium is established, the reaction proceeds to the

    A. left because K KTrial eq>B. left because K KTrial eqD. right because K KTrial eq 7B. basic with pH < 7C. acidic with pH > 7D. acidic with pH < 7

    32. Which would produce a yellow solution at a pH = 4 0. ? (1 mark)

    A. methyl redB. methyl violetC. indigo carmineD. chlorophenol red

  • OVER- 11 -

    33. How many moles of NaOH are required to react completelywith 100 0 2 5 3. .mL of M HNO ? (1 mark)

    A. 0 0063. mol

    B. 0 25. mol

    C. 2 5. mol

    D. 250 mol

    34. The net ionic equation for the reaction between HCl and KOH is (1 mark)

    A. H OH H O+ + 2

    B. HCl KOH H O KCl+ +2

    C. H Cl K OH H O KCl+ + + + + +2

    D. H Cl K OH H O K Cl+ + + + + + + +2

    35. Which of the following titrations would have a pH > 7 at the equivalence point? (1 mark)

    A. HI with KOH

    B. HClO with NH4 3C. HCl with Sr OH( )2D. HCOOH with NaOH

    36. A buffer can be made from equal moles of (2 marks)

    A. HCl and NaCl

    B. HCN and KOH

    C. HNO and NH3 3D. CH COOH and NaCH COO3 3

    37. Which of the following dissolves in water to produce a basic solution? (1 mark)

    A. O2B. SO2C. NO2D. MgO

  • - 12 -

    38. Consider the following spontaneous reaction: (1 mark)

    2 3 2 32 3Al Cu Al Cus aq aq s( ) ( )+

    ( )+

    ( )+ +

    In this reaction, the oxidizing agent is

    A. AlB. Cu

    C. Al3+

    D. Cu2+

    39. Bromine has an oxidation number of +3 in (1 mark)

    A. KBrOB. KBrO2C. KBrO3D. KBrO4

    40. In an experiment, Te reacts spontaneously with Ag+ but not with Ti2+ .The relative strength of oxidizing agents from strongest to weakest is (2 marks)

    A. Ag Te Ti+ + +> >4 2

    B. Ag Ti Te+ + +> >2 4

    C. Te Ti Ag4 2+ + +> >D. Ti Te Ag2 4+ + +> >

  • OVER- 13 -

    41. A piece of Au does not react spontaneously with 1 0. M HCl.Which of the following statements is true? (1 mark)

    A. Au is a weaker reducing agent than