Chemistry revision form 5==Questions from DIAGRAMS -2010
1) Change of ethanol to ethene
a) What is the name of this reaction?...................................................................
b) How do you test the presence of ethene? ……………………………………………………………………………………………
c) What is the function of porcelain chips? ………………………………………………………….
d) Write chemical equation for heating of ethanol in porcelain chips
…………………………………………………………………………………………..
e) State 2 physical properties of ethanol
…………………………………………………………………….
f) State 2 physical properties of ethene
…………………………………………..
g) If propanol is heated over the porcelain chips to replace ethanol, state the gas that could be collected……………………………………………..
2) Oxidation of ethanol to ethanoic acid
a) What is the name of this reaction?...................................................................
b) State observations in the boiling tube …………………………………………………………………
c) What is the function of Acidified potassium dichromate(VI) solution? ………………………………………………………….
d) Write chemical equation …………………………………………………………………………………………..
e) Name the distillate formed …………………………………………….
f) Draw structural formula of the distillate
g) State 2 chemical properties of distillate formed
……………………………………………………………
3) To determine the reactivity series of 3 different metals by reacting metals with oxygen
a) If Z is zinc metal, Y is lead metal and X is copper metal,
State observations in the boiling tube
z……………………………………………………………………………………………..
Y ………………………………………………………………………………………….
x ………………………………………………………………………………………
b) What is the function of Potassium manganate (VII) ? ………………………………………………………….
c) What is the function of glass wool?
…………………………………………………………………..
d) Write chemical equation for reaction in the tube with Z metal
……………………………………………………………………..
e) From d) above, what substance is oxidized?, explain your answer
………………………………………………………………………………
f) State 2 chemical properties of Z oxide formed
………………………………………………….
4) Electroplating iron spoon with silver
a) Mark cathode and anode
b) State observations at cathode ………………………………………
and at anode ………………………….
c) Write half equation at cathode …………………………………………………… and at anode ……………………………………..
d) If the iron spoon is to be coated with copper, state object used at cathode ……………………….object at anode ………………………………. and electrolyte used…………………………………………….…..
5) Diagram of latex particle
a) State substance to be used to keep latex coagulate fast …………………………
b) State substance to be used to keep latex in liquid form…………………………..
c) Vulcanized rubber is formed when X is added to dry latex What is X?..........
d) Explain how the addition of substance X improve the property of natural rubber
………………………………………………………………………………………………
e) State 3 better properties of vulcanized rubber compared to the unvulcanised ones
………………………………………………………………………………….
………………………………………………………………………………….
………………………………………………………………………………
Continue for set 2……………insyAllah!........
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