This document discusses several chemical reactions and concepts: 1) It describes the dehydration of ethanol to produce ethene, and the test to identify ethene using bromine. 2) It discusses the oxidation of ethanol to produce ethanoic acid, including the chemical equation and properties of ethanoic acid. 3) It covers several homologous series including alkanes, alkenes, alcohols, carboxylic acids, and esters.

1. 1)Change of ethanol to ethane

2. What is the name of this reaction?
• Dehydration reaction

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. c)What is the function of porcelain
chips?
• Act as catalyst /dehydrating
agent

5. Write chemical equation for heating of
ethanol in porcelain chips
C2H5OH  C2H4 + H2O

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. g) If propanol is heated over the
porcelain chips to replace ethanol,
state the gas that could be collected
Propene gas

8. Oxidation of ethanol to ethanoic acid

9. a) What is the name of this reaction?.
• Oxidation reaction

10. b) State observations in the boiling
tube
• The colour of acidified
potassium dichromate (VI)
solution change from orange
to green

11. c) What is the function of Acidified
potassium dichromate(VI) solution?
As oxidising agent

12. d) Write chemical equation
C2H5OH + 2[O]
CH3COOH+ H2O

13. E) Name the distillate formed
• Ethanoic acid

14. f)Draw structural formula of the
distillate

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. Name structures below and state
homologous series and general
formula

17. n- butane
2-methylbutane
Alkane
Cn H2n+2
Alkane
Cn H2n+2

18. propene
2-butene/
but-2-ene
Alkene
Cn H2n
Alkene
Cn H2n

19. 3-butanol/
butan-3-ol
Propanoic
acid
Alcohol
Cn H2n+1OH
Carboxylic acid
Cn H2n+1 COOH

20. Ethyl propanoate
ester
Cn H2n +1 COO CmH2m+1

22. 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

23. • 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

24. •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

25. 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

26. Mark
cathode and
anode
Cathode Anode

27. State observations at cathode
and at anode
• At cathode
Iron spoon is plated white shiny
deposit
• At anode
Silver electrode corrodes/ becomes
smaller

28. Write half equation at cathode and at
anode
• At cathode
Ag + e  Ag
• At anode
+
Ag  Ag + e+

29. State observations at cathode
and at anode
• At cathode
Iron spoon is plated white shiny
deposit
• At anode
Silver electrode corrodes/ becomes
smaller

30. 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

32. • 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

33. 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)

34. 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)

37. 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)

38. 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

39. 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