Questions diagram set 1=terkini 1

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Questions diagram set 1=terkini 1

  1. 1. 1)Change of ethanol to ethane
  2. 2. What is the name of this reaction? • Dehydration reaction
  3. 3. How do you test the presence of ethene? • Collect the gas in a test tube • Pour some solution of bromine • Shake hard • The brown bromine is decolourised
  4. 4. c)What is the function of porcelain chips? • Act as catalyst /dehydrating agent
  5. 5. Write chemical equation for heating of ethanol in porcelain chips C2H5OH  C2H4 + H2O
  6. 6. e)State 2 physical properties of ethanol • 1) colourless liquid at room temperature • 2)highly volatile • 3)soluble in water • 4) low melting point and boiling point
  7. 7. g) If propanol is heated over the porcelain chips to replace ethanol, state the gas that could be collected Propene gas
  8. 8. Oxidation of ethanol to ethanoic acid
  9. 9. a) What is the name of this reaction?. • Oxidation reaction
  10. 10. b) State observations in the boiling tube • The colour of acidified potassium dichromate (VI) solution change from orange to green
  11. 11. c) What is the function of Acidified potassium dichromate(VI) solution? As oxidising agent
  12. 12. d) Write chemical equation C2H5OH + 2[O] CH3COOH+ H2O
  13. 13. E) Name the distillate formed • Ethanoic acid
  14. 14. f)Draw structural formula of the distillate
  15. 15. g)State 2 chemical properties of distillate formed • 1) reacts with alcohol to form ester and water • 2)reacts with alkali/base to produce salt and water • 3)react with metal to produce salt and hydrogen gas • 4)react with metal carbonate to produce salt , carbon dioxide and water
  16. 16. Name structures below and state homologous series and general formula
  17. 17. n- butane 2-methylbutane Alkane Cn H2n+2 Alkane Cn H2n+2
  18. 18. propene 2-butene/ but-2-ene Alkene Cn H2n Alkene Cn H2n
  19. 19. 3-butanol/ butan-3-ol Propanoic acid Alcohol Cn H2n+1OH Carboxylic acid Cn H2n+1 COOH
  20. 20. Ethyl propanoate ester Cn H2n +1 COO CmH2m+1
  21. 21. If Z is zinc metal, Y is lead metal and X is copper metal,State observations in the boiling tube •Z burns brightly leaving solid -yellow when hot, white when cold •Y burns less brightly leaving solid- brown when hot and yellow when cold •X burns slowly leaving black solid
  22. 22. • What is the function of Potassium manganate (VII) ? • What is the function of glass wool? •To provide oxygen gas when heated •To prevent KMnO4 from mixing with metal and to avoid explosion from occuring
  23. 23. •Write chemical equation for reaction in the tube with Z metal •From d) above, what substance is oxidized?, explain your answer Z + O2  ZO or Zn + O2  ZnO •Z or zinc is oxidised -oxidation number of zinc increase from 0 to +2 OR Z gain oxygen to form ZO
  24. 24. State 2 chemical properties of Z oxide formed •Reacts with acid to form salt and water •Reacts with alkali to form salt and water •This is because zinc oxide is an amphotheric oxide
  25. 25. Mark cathode and anode Cathode Anode
  26. 26. State observations at cathode and at anode • At cathode Iron spoon is plated white shiny deposit • At anode Silver electrode corrodes/ becomes smaller
  27. 27. Write half equation at cathode and at anode • At cathode Ag + e  Ag • At anode + Ag  Ag + e+
  28. 28. State observations at cathode and at anode • At cathode Iron spoon is plated white shiny deposit • At anode Silver electrode corrodes/ becomes smaller
  29. 29. If the iron spoon is to be coated with copper, state object used at cathode and object at anode and electrolyte used • At cathode Iron spoon • At anode Copper electrode • electrolyte Copper (II) sulphate or copper(II) nitrate
  30. 30. • State substance to be used to keep latex coagulate fast • State substance to be used to keep latex in liquid form • Vulcanized rubber is formed when X is added to dry latex What is X? Ethanoic acid Ammonia solution Sulphur 0r solution of disulphur monochloride in methyl benzene
  31. 31. Explain how the addition of substance X improve the property of natural rubber Addition of sulphur forms cross-link (bridges) between long-chain molecules (rubber polymers)
  32. 32. State 3 better properties of vulcanized rubber compared to the unvulcanised ones •Harder and stronger •More elastic •More resistant toward oxidation by air •Higher tensile strength •Has higher melting point( so can withstand high temperature)
  33. 33. reaction Name of catalyst 1) Hydrogenation of ethene to ethane 2) Decomposition of hydrogen peroxide 3) Reaction of sulphuric acid with zinc Nickel or platinum Manganese(IV) oxide Copper(II) sulphate (aq)
  34. 34. reaction Name of catalyst 1) Change of SO2 to SO3 in contact process 2) Haber process 3)Esterification reaction 4) Alkene to alkane Nickel or Vanadium(V) oxide Iron Concentrated H2SO4
  35. 35. reaction Name of catalyst 1) Alkene to alcohol 2) Dehydration reaction of ethanol to ethene 3) Glucose to ethanol Phosphoric acid Porcelain chips or Al2O3 yeast

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