7/28/2019 Form 5 Chapter 2 Carbon Compounds (Good)

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FORM 5 CHAPTER 2 CARBON COMPOUNDS

ANALYSIS OF PAST YEAR QUESTIONS FROM 2003 - 2008

1 SPM 2003/P2/Q4Figure 4 shows the set-up of apparatus for the preparation of ethyl ethanoate from the reaction ofethanol with ethanoic acid.

(a) On the Liebig condenser in Figure 4, mark X to indicate the place where water flows in and Ywhere water flows out.

[1 mark]

(b) Why is the mixture heated using a water bath?

[2 marks]

(i) Name the reaction for the preparation of ethyl ethanoate.

.[1 mark]

(ii) Write the chemical equation for the reaction in (c)(i).

.[1 mark]

(c) The experiment is repeated by replacing ethanol with propanol.(i) Name the ester formed.

[1 mark]

(ii) State one physical property of the ester.

7/28/2019 Form 5 Chapter 2 Carbon Compounds (Good)

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[1mark]

(d) The flow chart below shows the conversion of ethanol to ethane and ethanol to ethanoic acid.

Based on the flow chart, write the chemical equation for

(e) (i) Process I.

..[1 mark]

(ii) Process II

[1 mark]

(f) An alkene has a structural formula as shown below

What is the name of the alkane?

.[1 mark]

2 SPM 2004/P2/Q6Figure 6 shows the reaction in the preparation of margarine.

(a) (i) Name the process used to produce margarine in Figure 6.

[1 mark]

(ii) State one effect of this process on the vegetable oil.

.. [1 mark]

(b) (i) Name catalyst X and state the range of temperature Y in the production of margarine.

Catalyst X:

Temperature Y: ........ oC.[2 marks]

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[Concept based on Chapter 1: Rate of reaction](ii) Based on the collision theory, explain the effect of catalyst X and temperature Y in the

production of margarine.

.[3 marks]

(iii) Write the chemical formula for margarine in Figure 6.

[1 mark]

(c) Name one example of a vegetable oil used in the production of margarine.

..[1 mark]

3 SPM 2008/P2/Q4The following information is about the compound C2H5OH.

(a) What is the name of this compound?

[1 mark]

(b) What is the general formula for the homologous series of this compound?

..[1 mark]

(c) One mole of this compound undergoes complete combustion to form gas X and water as shownbelow.

(i) State the name of gas X

[1 mark]

(ii) What are the values of m and n?

Miscible in all proportions with water

Undergoes combustion

A member of a homologous series

C2H5OH + mO2 nX + 3H2O

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m = ..

n = .[2marks]

(d) Compound C2H5OH reacts with ethanoic acid to produce compound Y which has a sweetpleasant smell.(i) State the name of compound Y.

[1 mark]

(ii) Draw the structural formula of compound Y.

[1 mark](e) Compound C2H5OH undergoes dehydration to produce ethene.

(i) Suggest one dehydration agent for this reaction.

...[1 mark]

(ii) Draw an apparatus set-up for this dehydration reaction to collect ethane.

[2 marks]

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FORM 5 CHAPTERR 2 CARBON COMPOUNDS

Question 1 2003/P2/Q4(a)

(b) Heat supplied is uniform (or prevents the solution from evaporating too fast)(c) (i) Esterification

(ii) C2H5OH + CH3COOH CH3COOC2H5 + H2O(d) (i) Propyl ethanoate

(ii) [Note: Choose any one of the following answers]1. Fruity smell 2. Colourless liquid3. Low boiling point (volatile) 4. Insoluble in water

(e) (i) C2H5OH C2H4 + H2O(ii) C2H5OH + 2[O] CH3COOH + H2O

(f) Butane

Question 2 2004/P2/Q6(a) (i) Hydrogenation

(ii) Vegetable oil changes from liquid to solid (or changes vegetable oil from unsaturatedfats to saturated fats or changes double bond in vegetable oil molecule to singlebond)

(b) (i) Catalyst X : Nickel (or platinum)Temperature : 100oC (or 200oC)

(ii) 1. Presence ofcatalyst reduces the activation energy2. At a high temperature, particles possess high kinetic energy and3. hence effective collision increases and rate of reaction increases

(iii)

or

(c) Palm oil (orcoconut oil orcorn oil or othernamed oil example)

Question 3 2008/P2/Q4(a) Ethanol

(b) CnH2n+1OH(c) (i) Carbon dioxide

(ii) m = 3 , n = 2

(d) (i) Ethyl ethanoate(ii)

(e) (i) [Choose any one of the following answers]Porcelain chips or phosphoric acid or aluminium oxide

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(ii)