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1
(a)
Ethene
(b)
1
- CnH2n
1
-Carbon- carbon double bond/
| | -C=C| |
1
(c)
(i)
C2H4 + 3H2O 3CO2 + 2H2O - correct reactants and products - balanced equation
1 1
(d )
(i)
Porous pot/Concentrated sulfuric acid /Porcelain chips/Aluminium oxide
1
(ii)
Glass wool soaked With ethanol
warm
1
Porcelain chips Compound C2H4
Heat
water
-Functional diagram -Labelled diagram
!=
1
(e)
(i)
- C2H4 is an unsaturated hydrocarbon/ has double bond but Ethane is a saturated hydrocarbon/ has single bond -C2H4 can undergoes bromination but ethane does not
(ii)
1 1
H H | | H-C-C- H | | Br Br
1
TOTAL
9
(a)
(b)
11
(i)
ethene / propene / butene C2H4 /C3H6 / C4H8
1 1..….2
(ii)
ethanol and ethanoic acid // propanol and propanoic acid // butanol and butanoic acid
1+1 …2
(iii)
Correct formula of reactants and products Balanced Sample answer C2H5OH + 2[O] → CH 3COOH + H2O Orange to green Sample answer 3 Pour [ 2-5 cm ] ethanoic acid into a boiling tube 3 Add [ 2-5 cm ] ethanol into the acid Add a few drops of concentrated sulphuric acid Heat the mixture CH3COOH + C 2H5OH→ CH3COOC2H5 + H2O
1 1
Functional diagram Label
1 1……2
Compound Y contains a lot of hydrogen ions + H ions neutralize the negative charge on the protein membranes The particles collide and the protein membranes break Rubber molecules / polymers are released and combined Compound T contains OH ion The existent of bacteria in natural conditions + Bacteria produce weak acid /little H ions
1 1 1 1 1 1 1 Max 5 1 …...6
(i)
1 ……3
1 1 1 1 1 ……5
(ii)
(c)
Compound T : Example: Ammonia TOTAL ![
20
No soalan 10 (a)(i)
Rubrik
Markah 1 1 1 1 1 1 1
P: Alkene Q: Alkane R: Alcohol S: Carboxylic acid I: Hydrogenation II: Dehydration III: Oxidation
(ii) H
H
H
H-C = C - C
H -
C - H
//
H H But-1-ene
1
1
// H
H
H
H 1
H-C - C =
C
-
C - H
H
//
H But-2-ene
1 //
H
H
H- C = C
-
C -H
1
H
H - C- H H 2- methylpropene
!>
1
(iii)
1.
2 cm3 of compound R and compound S are poured into two different test tubes.
1
2.
Each of the test tubes is put in with magnesium/zinc/ aluminium / ferum ribbon/powder//[calcium carbonate]
1 1
3.
(iii)
The effervescence of gas occurs in test tube containing compound S while there are no reaction in test containing compound R.
Bahan dan radas: ethanoic acid pentanol
1 1
Procedure: [4-10] cm3 of pentanol is poured into a boiling tube. 1 [2 -5] cm3 of ethanoic acid is is added . 2 3 [2-5] drops of concentrated sulphuric acid are added and the mixture is shaken well. 4 The mixture is heated .
1 1 1 1
Observation: A colourless liquid is produced//a sweet fruity smell is produced
1
CH3COOH
1
+
C 5H11OH
CH3COO C5H11 + H2O
Total
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