questions diagram set 1=terkini 1
TRANSCRIPT
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1)Change of ethanol to ethane
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What is the name of this reaction?
• Dehydration reaction
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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
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c)What is the function of porcelain chips?
• Act as catalyst /dehydrating agent
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Write chemical equation for heating of ethanol in porcelain chips
C2H5OH C2H4 + H2O
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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
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g) If propanol is heated over the porcelain chips to replace ethanol,
state the gas that could be collected
Propene gas
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Oxidation of ethanol to ethanoic acid
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a) What is the name of this reaction?.
• Oxidation reaction
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b) State observations in the boiling tube
• The colour of acidified potassium dichromate (VI) solution change from orange to green
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c) What is the function of Acidified potassium dichromate(VI) solution?
As oxidising agent
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d) Write chemical equation
C2H5OH + 2[O]
CH3COOH+ H2O
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E) Name the distillate formed
• Ethanoic acid
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f)Draw structural formula of the distillate
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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
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Name structures below and state homologous series and general
formula
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n- butane
2-methylbutane
AlkaneCn H2n+2
AlkaneCn H2n+2
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propene
2-butene/but-2-ene
AlkeneCn H2n
AlkeneCn H2n
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3-butanol/butan-3-ol
Propanoic acid
AlcoholCn H2n+1OH
Carboxylic acidCn H2n+1 COOH
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Ethyl propanoate esterCn H2n +1 COO CmH2m+1
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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
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• 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
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•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 ORZ gain oxygen to form ZO
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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
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Mark cathode and anode
Cathode
Anode
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State observations at cathode and at anode
• At cathode
Iron spoon is plated white shiny deposit • At anode
Silver electrode corrodes/ becomes smaller
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Write half equation at cathode and at anode
• At cathode
Ag + e Ag
• At anode
+
Ag Ag + e+
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State observations at cathode and at anode
• At cathode
Iron spoon is plated white shiny deposit • At anode
Silver electrode corrodes/ becomes smaller
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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
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• 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
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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)
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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)
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reaction Name of catalyst1) Hydrogenation of ethene to ethane2) Decomposition of hydrogen peroxide3) Reaction of sulphuric acid with zinc
Nickel or platinum
Manganese(IV) oxide
Copper(II) sulphate (aq)
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reaction Name of catalyst1) Change of SO2 to SO3 in contact process2) Haber process
3)Esterification reaction4) Alkene to alkane
Nickel or platinum
Vanadium(V) oxide
Iron
Concentrated H2SO4
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reaction Name of catalyst1) Alkene to alcohol
2) Dehydration reaction of ethanol to ethene3) Glucose to ethanol
Phosphoric acid
Porcelain chips or Al2O3
yeast
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