Year 2007  No 7c)  REVISON ON SALT
(c) Table 7 shows the observations from some tests carried out on salt  X. Test Observation I:  Heating of salt X solid A ...
Based on the information in Table 7:  (i) Identify an anion that is present in Test I and describe a chemical test to veri...
Based on the information in Table 7:  (i) Identify an anion that is present in Test I and describe a chemical test to veri...
(ii) Identify  three  cations that are present in Test II and describe a chemical test to verify the cations.  [6m]   <ul>...
Confirmatory test using Na 2 SO 4  : <ul><li>Pour 2 cm 3  of solution X into a test tube </li></ul><ul><li>Add sodium sulp...
Confirmatory test using KI solution : <ul><li>Add potassium iodide solution to the solution, shake well  </li></ul><ul><li...
<ul><li>REVISION ON  </li></ul><ul><li>CARBON COMPOUND </li></ul>SPM 2007 NO : 9a
Diagram 9 shows how compound G is formed from alkene Alkene + H 2 O Compound F Compound G + H 2 O Phosphoric acid, 300 O C...
(i)  Name one alkene that has less than four carbon atoms. Draw its structural formula. or ethene propene
ii) Based on your answer in 9 ai) what is the name of compound F and Compound G Name of alkene ethene propene Name of Comp...
iii) State three chemical properties of compound F and three properties of compound G <ul><li>COMPOUND F ( alcohol) </li><...
<ul><li>COMPOUND G (alkene) </li></ul><ul><ul><li>Burns in excess oxygen to form CO 2  and H 2 O. </li></ul></ul><ul><ul><...
<ul><li>REVISION ON CARBON COMPOUNDS </li></ul>SPM 2007, Q: 9b
Alkenes, alcohols and carboxylic acids are three different homologous series.  Construct a table  to show the  general for...
HMLGOS SERIES ALKENE ALCOHOLS CARBOXYLIC ACIDS GEN FORMLA C n H 2n   n= 2,3, 4… C n H 2n+1 OH  n= 1,2, 3…. C n H 2n+1 COOH...
HOMOUS SERIES ALKENE ALCHOLS CARBXIC ACIDS FUNCTN GROUP Carbon- carbon double bond (-C=C-) Hydroxyl (-C-OH) Carboxyl  ( -C...
HOMOUS SERIES ALKENE ALCOLS CARBYLIC ACIDS NAME OF MEMBER ethene ethanol Ethanoic acid OR propene propanol Propanoic acid ...
Year 2007 question no 10 REVISON ON thermochemistry
data from Exp I and Exp II that were carried out to study the rate of reaction of zinc with two acids,  P  and  Q. Exp Rea...
<ul><li>(i)  By choosing either Experiment I or Experiment II, state the name of the acid used. </li></ul><ul><li>  </li><...
<ul><li>(i)  Write the chemical equation for the reaction of this acid with zinc.  [2 marks] </li></ul>
<ul><li>(ii)  Draw an energy profile diagram for the reaction in 10(a)(i). On the energy profile diagram show the: </li></...
∆ H E- activattion energy without catalyst E’- activattion energy with catalyst energy Energy profile diagram of reaction ...
<ul><li>(ii)  Explain the energy profile diagram. </li></ul>∆ H
<ul><li>(ii)  Explain the energy profile diagram. </li></ul>∆ H
<ul><li>(ii)  Explain the energy profile diagram. </li></ul>∆ H ∆ H
<ul><li>(ii)  Explain the energy profile diagram. </li></ul>∆ H
<ul><li>(ii)  Explain the energy profile diagram. </li></ul>∆ H
SPM 2008 QUESTION 8 REVISION ON  Section B - electrochemistry
Diagram 8.1 shows the apparatus set up  for the electrolysis of sodium chloride solution using carbon as electrode
(a) State the factors that determine the products formed at electrode P and electrode Q <ul><li>Electrode P : Position of ...
b ) Explain the reactions at  electrode P and Q.  <ul><li>List of ions attracted to </li></ul><ul><li>i) electrode P: Na  ...
<ul><li>The reason why the ions selectively discharged at : </li></ul><ul><li>i) Electrode P:  </li></ul><ul><li>H +  ion ...
<ul><li>Half equations for each reaction </li></ul><ul><li>Electrode P: </li></ul><ul><li>2H +   + 2e  </li></ul><ul><li>H...
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Chemistry revision presentation on section b dan c past year paper = ogos 2011

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Chemistry revision presentation on section b dan c past year paper = ogos 2011

  1. 1. Year 2007 No 7c) REVISON ON SALT
  2. 2. (c) Table 7 shows the observations from some tests carried out on salt X. Test Observation I: Heating of salt X solid A metal oxide is formed and a brown gas is given off II. Salt X solution is mixed with excess aqueous ammonia A white precipitate which is insoluble in excess aqueous ammonia is formed
  3. 3. Based on the information in Table 7: (i) Identify an anion that is present in Test I and describe a chemical test to verify the anion [4m] <ul><li>Anion is nitrate ion </li></ul>
  4. 4. Based on the information in Table 7: (i) Identify an anion that is present in Test I and describe a chemical test to verify the anion [4m] Chemical test: <ul><li>Pour 2 cm 3 of the solution X into a test tube </li></ul><ul><li>Add dilute sulphuric acid followed </li></ul><ul><li>with iron(II) sulphate solution </li></ul><ul><li>Shake well the mixture and slant the test tube </li></ul><ul><li>Add concentrated sulphuric acid slowly drop by drop. Observation: brown ring formed </li></ul>
  5. 5. (ii) Identify three cations that are present in Test II and describe a chemical test to verify the cations. [6m]   <ul><li>Cations present: Mg 2+ , Pb 2+ , Al 3+ </li></ul><ul><li>Test with NaOH: </li></ul><ul><li>- Add little NaOH solution then in excess </li></ul><ul><li>Observation: </li></ul><ul><li>If white precipitate soluble is formed, </li></ul><ul><li>then Pb 2+ and Al 3+ present </li></ul><ul><li>If white precipitate is formed ,then </li></ul><ul><li>Mg 2+ is present </li></ul>
  6. 6. Confirmatory test using Na 2 SO 4 : <ul><li>Pour 2 cm 3 of solution X into a test tube </li></ul><ul><li>Add sodium sulphate solution to the solution X </li></ul><ul><li>If no precipitate is formed , then Al 3+ present </li></ul><ul><li>If white precipitate formed, then Pb 2+ present </li></ul>OR
  7. 7. Confirmatory test using KI solution : <ul><li>Add potassium iodide solution to the solution, shake well </li></ul><ul><li>If no precipitate formed, then Al 3+ present </li></ul><ul><li>If yellow precipitate formed, then Pb 2+ present </li></ul>
  8. 8. <ul><li>REVISION ON </li></ul><ul><li>CARBON COMPOUND </li></ul>SPM 2007 NO : 9a
  9. 9. Diagram 9 shows how compound G is formed from alkene Alkene + H 2 O Compound F Compound G + H 2 O Phosphoric acid, 300 O C, 60 atm Porcelain chips
  10. 10. (i) Name one alkene that has less than four carbon atoms. Draw its structural formula. or ethene propene
  11. 11. ii) Based on your answer in 9 ai) what is the name of compound F and Compound G Name of alkene ethene propene Name of Compound F ethanol propanol Name of Compound G ethene propene Alkene + H 2 O Compound F Compound G + H 2 O Phosphoric acid, 300 O C, 60 atm Porcelain chips
  12. 12. iii) State three chemical properties of compound F and three properties of compound G <ul><li>COMPOUND F ( alcohol) </li></ul><ul><ul><li>Burn in excess oxygen producing water and carbon dioxide. </li></ul></ul><ul><ul><li>Can be dehydrated to produce alkene. </li></ul></ul><ul><ul><li>Can be oxidised to produce carboxylic acid </li></ul></ul>Alkene + H 2 O Compound F Compound G + H 2 O Phosphoric acid, 300 O C, 60 atm Porcelain chips
  13. 13. <ul><li>COMPOUND G (alkene) </li></ul><ul><ul><li>Burns in excess oxygen to form CO 2 and H 2 O. </li></ul></ul><ul><ul><li>Undergoes additional reaction: </li></ul></ul><ul><ul><ul><li>Hydrogenation to produce alkane </li></ul></ul></ul><ul><ul><ul><li>Hydration to produce alcohol </li></ul></ul></ul><ul><ul><ul><li>Halogenation </li></ul></ul></ul><ul><ul><li>Undergoes polymerisation reaction . </li></ul></ul>Alkene + H 2 O Compound F Compound G + H 2 O Phosphoric acid, 300 O C, 60 atm Porcelain chips
  14. 14. <ul><li>REVISION ON CARBON COMPOUNDS </li></ul>SPM 2007, Q: 9b
  15. 15. Alkenes, alcohols and carboxylic acids are three different homologous series. Construct a table to show the general formula , the functional group and the name of a member in each of the series.
  16. 16. HMLGOS SERIES ALKENE ALCOHOLS CARBOXYLIC ACIDS GEN FORMLA C n H 2n n= 2,3, 4… C n H 2n+1 OH n= 1,2, 3…. C n H 2n+1 COOH n=0,1,2….
  17. 17. HOMOUS SERIES ALKENE ALCHOLS CARBXIC ACIDS FUNCTN GROUP Carbon- carbon double bond (-C=C-) Hydroxyl (-C-OH) Carboxyl ( -COOH )
  18. 18. HOMOUS SERIES ALKENE ALCOLS CARBYLIC ACIDS NAME OF MEMBER ethene ethanol Ethanoic acid OR propene propanol Propanoic acid OR butene butanol Butanoic acid
  19. 19. Year 2007 question no 10 REVISON ON thermochemistry
  20. 20. data from Exp I and Exp II that were carried out to study the rate of reaction of zinc with two acids, P and Q. Exp Reactants Products Observation I 2.6 g of zinc and 50 cm 3 of acid P 2.0 mol dm -3 Zinc chloride and hydrogen gas The temperature of the mixture increases II 2.6 g of zinc and 50 cm 3 of acid Q 2.0 mol dm -3 Zinc sulphate and hydrogen gas The temperature of the mixture increases
  21. 21. <ul><li>(i) By choosing either Experiment I or Experiment II, state the name of the acid used. </li></ul><ul><li>  </li></ul>
  22. 22. <ul><li>(i) Write the chemical equation for the reaction of this acid with zinc. [2 marks] </li></ul>
  23. 23. <ul><li>(ii) Draw an energy profile diagram for the reaction in 10(a)(i). On the energy profile diagram show the: </li></ul><ul><ul><li>Heat of reaction, AH </li></ul></ul><ul><ul><li>Activation energy without a catalyst, </li></ul></ul><ul><ul><li>Activation energy with a catalyst, E' </li></ul></ul><ul><li>Explain the energy profile diagram. [10 marks] </li></ul>
  24. 24. ∆ H E- activattion energy without catalyst E’- activattion energy with catalyst energy Energy profile diagram of reaction zinc and hydrochloric acid
  25. 25. <ul><li>(ii) Explain the energy profile diagram. </li></ul>∆ H
  26. 26. <ul><li>(ii) Explain the energy profile diagram. </li></ul>∆ H
  27. 27. <ul><li>(ii) Explain the energy profile diagram. </li></ul>∆ H ∆ H
  28. 28. <ul><li>(ii) Explain the energy profile diagram. </li></ul>∆ H
  29. 29. <ul><li>(ii) Explain the energy profile diagram. </li></ul>∆ H
  30. 30. SPM 2008 QUESTION 8 REVISION ON Section B - electrochemistry
  31. 31. Diagram 8.1 shows the apparatus set up for the electrolysis of sodium chloride solution using carbon as electrode
  32. 32. (a) State the factors that determine the products formed at electrode P and electrode Q <ul><li>Electrode P : Position of ions in electrochemical series </li></ul><ul><li>Electrode Q : Concentration of ions in the electrolyte. </li></ul>
  33. 33. b ) Explain the reactions at electrode P and Q. <ul><li>List of ions attracted to </li></ul><ul><li>i) electrode P: Na + , H + </li></ul><ul><li>ii) Electrode Q : Cl - , OH - </li></ul><ul><li>Names of ions discharged at </li></ul><ul><li>i) electrode P: Hydrogen ion </li></ul><ul><li>ii) Electrode Q : Chloride ion </li></ul>
  34. 34. <ul><li>The reason why the ions selectively discharged at : </li></ul><ul><li>i) Electrode P: </li></ul><ul><li>H + ion is lower than Na + ion in electrochemical series </li></ul><ul><li>ii) Electrode Q : Cl - ion is more concentrated than OH - ion </li></ul>
  35. 35. <ul><li>Half equations for each reaction </li></ul><ul><li>Electrode P: </li></ul><ul><li>2H + + 2e </li></ul><ul><li>H 2 </li></ul><ul><li>ii) Electrode Q : </li></ul><ul><li>2Cl - Cl 2 + 2e </li></ul>
  36. 36. END

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