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7 penskoran paper 3 2011

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  • 1. PENSKORAN // SCORING SPM Chemistry Paper 3 2011 Question No. 1 Question No. 2 [Click button to see the question]CHEMISTRY PAPER 3 4541/3 1
  • 2. 2011 Question no. 1(a)(i) Score 3: Able to state the OBSERVATION correctlySample answer 1. ‘X’ disappears from sight // 2. ‘X’ cannot be seen // 3. Yellow precipitate // 4. Yellow solid // 5. Solid cover ‘X’ // 6. Precipitate cover ‘X’ 2
  • 3. 2011 Question no. 1(a)(ii) Score 3: Able to state the INFERENCE correctlySample answer 1. Sulphur is formed // 2. Rate of reaction in Set I is higher // 3. Rate of reaction in Set IV is the lowest // 3
  • 4. 2011 Question no. 1(b)Score : Able to state all three VARIABLESSample answerManipulated variable:Concentration of sodium thiosulphate solutionReject: concentratedResponding variable:Time taken ‘X’ to disappear // Rate of reactionConstant variable:Volume of sodium thiosulphate solution //Volume and concentration of hydrochloric acid //Volume/size of conical flask // temperature //Hydrochloric acid // sodium thiosulphate 4
  • 5. 2011 Question no. 1(c) Score 3: Able to state the relationship between manipulated variable and the responding variable and state the directionSample answer The higher the concentration of sodium thiosulphate solution, the higher the rate of reaction // The higher the concentration of sodium thiosulphate solution, the shorter the time taken for ‘X’ disappear Note: MV + RV + direction 5
  • 6. 2011 Question no. 1(d) Score 3: Able to give the OPERATIONAL DEFINITION accurately Sample answer What have been done1. The time taken for the yellow precipitate to form, until ‘X’ mark is disappear / not seen What did you see 6
  • 7. 2011 Question no. 1(e)(i)Score 3: Able to write all the time taken and calculate the value 1/time to two decimal placesSample answer Set II III IV Time (s) 25 33 50 1/time (s-1) 0.04 0.03 0.02 7
  • 8. 2011 Question no. 1(e)(ii)Score 3: Able to PLOT A GRAPH correctly which fulfills all the following criteria1. Both axes are labell and with units2. Uniform scale3. All points are transferred correctly4. Best fit straight line5. The size of graph must be more than 30% of the graph paper 8
  • 9. 2011 Question no. 1(f)(i)Score 3: Able to PREDICT the relationship between the concentration of sodium thiosulphate solution and the rate of reaction correctlySample AnswerThe higher the concentration of sodium thiosulphate solution, the rate of reaction increaseScore 1: The higher the concentration of sodium thiosulphate solution, the rate of reaction decrease 9
  • 10. 2011 Question no. 1(f)(ii)Score 3: Able to fulfill the following criteriaSample answer1. Extend the line on the graph2. Show on the graph the way to obtain the value3. State the time with unit PLOT YOUR GRAPH NOW 10
  • 11. 2011 Question no. 1(f)(ii) Score 3: Able to sketch the graph of volume of hydrogen gas against time Sample answerConcentration of sodiumthiosulphate solution (mol dm3) X-axis & Y-axis without unit : Score 2 0.02 Reverse axis, correct shape: Score 2 Reverse axis, wrong shape : Score 1 [15.0 ≤ X < 20] X 1/time (s-1) 11
  • 12. 2011 Question no. 1(g) Score 3: Able to EXPLAIN with comparison by referring to the height/quantity of precipitate formed in a certain time correctlySample answer 1. Smaller/less quantity of precipitate needed to cover ‘X’ 2. The precipitate formed higher/thicker 12
  • 13. 2011 Question no. 1(h)Score 3: Able to CLASSIFY all ions correctlySample answer Anions Cations Cl- Na+ OH- H+ S2O3 2- If state reversible: Score 1 13
  • 14. 2011 Question no. 2(a)Score 2: Able to state the PROBLEM STATEMENT of the experiment correctlySample answerHow to construct an ionic equation for the formation of lead(II) iodide / PbI2If state ‘Aim’: Score 1 14
  • 15. 2011 Question no. 2(b) Score 3: Able to state three variables correctlySample answerManipulated variable:Volume of potassium iodide solutionResponding variable:Height of precipitate formedConstant variable:1. Volume of concentration of lead(II) nitrate solution //2. Concentration of potassium iodide solution //3. Size of test tube //4. Temperature 15
  • 16. 2011 Question no. 2(c) Score 3: Able to state the relationship between manipulated variable and responding variable and the direction correctly Sample answer MVWhen the volume of potassium iodide solution increases, the height of precipitate formed increases the until maximum / no change / constant RV direction Reverse RV and MV with direction : Score 2 16
  • 17. 2011 Question no. 2(d)Score 3: Able to list complete substances and apparatusSample answerSubstances:1. Lead(II) nitrate (0.1 – 0.2 mol dm -3 )2. Potassium iodide (0.1 – 0.2 mol dm -3 )Apparatus:1. Ruler2. Test tube3. Test tube rack4. Stopper / glass rod5. Burette / pipette / syringe 17
  • 18. 2011 Question no. 2(e)Score 3: Able to state all the step in the procedure correctlySample answerProcedure: KEY WORD jangan lupa1. Label test tubes and put in the rack2. Pour (4 – 6 cm3 ) of lead(II) nitrate solution into the test tube3. Pour 1cm3 of potassium iodide solution into the first test tube, 2cm3 of potassium iodide solution into second test tube until the 8th test tube.4. Shake the test tube // stir the test tube5. Leave the test tube6. Measure and record the height of precipitate 18
  • 19. 2011 Question no. 2(f) Score 3: Able to tabulate the data with the following aspects 1. Correct titles with units 2. Complete list of volume to two decimal points Sample answerTest tube 1 2 3 4 5 6 7 8Volume of lead(II) nitrate 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00solution (mol dm-3 )Volume of potassium iodide 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00solution (mol dm-3 )Height (cm3) Value untuk ‘volume’ sudah dinyatakan dlm ‘procedure’ 19
  • 20. THE END Thank You KAMAL ARIFFIN BIN SAAIM SMK DATO’ BENTARA LUAR BATU PAHAT e-mel : kamal_ariffin2006@yahoo.com website: http://kemhawk.webs.com/ 20

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