Questions diagram set 1=terkini 1

1)Change of ethanol to ethane

What is the name of this reaction?

• Dehydration reaction

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

c)What is the function of porcelain chips?

• Act as catalyst /dehydrating agent

Write chemical equation for heating of ethanol in porcelain chips

C2H5OH C2H4 + H2O

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

g) If propanol is heated over the porcelain chips to replace ethanol,

state the gas that could be collected

Propene gas

Oxidation of ethanol to ethanoic acid

a) What is the name of this reaction?.

• Oxidation reaction

b) State observations in the boiling tube

• The colour of acidified potassium dichromate (VI) solution change from orange to green

c) What is the function of Acidified potassium dichromate(VI) solution?

As oxidising agent

d) Write chemical equation

C2H5OH + 2[O]

CH3COOH+ H2O

E) Name the distillate formed

• Ethanoic acid

f)Draw structural formula of the distillate

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

Name structures below and state homologous series and general

formula

n- butane

2-methylbutane

AlkaneCn H2n+2

AlkaneCn H2n+2

propene

2-butene/but-2-ene

AlkeneCn H2n

AlkeneCn H2n

3-butanol/butan-3-ol

Propanoic acid

AlcoholCn H2n+1OH

Carboxylic acidCn H2n+1 COOH

Ethyl propanoate esterCn H2n +1 COO CmH2m+1

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

• 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

•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

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

Mark cathode and anode

Cathode

Anode

State observations at cathode and at anode

• At cathode

Iron spoon is plated white shiny deposit • At anode

Silver electrode corrodes/ becomes smaller

Write half equation at cathode and at anode

• At cathode

Ag + e Ag

• At anode

+

Ag Ag + e+

State observations at cathode and at anode

• At cathode

Iron spoon is plated white shiny deposit • At anode

Silver electrode corrodes/ becomes smaller

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

• 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

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)

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)

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)

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

reaction Name of catalyst1) Alkene to alcohol

2) Dehydration reaction of ethanol to ethene3) Glucose to ethanol

Phosphoric acid

Porcelain chips or Al2O3

yeast