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IGCSEChemistryCambridge (CIE)Exam Questions11. Organic ChemistryOrganic Families

Organic Families (Cambridge (CIE) IGCSE Chemistry): Exam Questions

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Organic Families

1a2 marks

Ethanol was reacted with hot acidified potassium manganate(VII) solution using the apparatus below. Ethanoic acid was formed.

ethanol-to-ethanoic-acid-equipment-to-label

i) Complete the box to identify the piece of apparatus labelled.

 [1]

 ii) Label the arrows.

 [1]

How did you do?

1b3 marks

i) Suggest and explain why an electric heater is used to heat this reaction and not a Bunsen burner.

 [2]

 ii) Suggest why a condenser is necessary.

 [1]

1c2 marks

Complete the table to show the difference in smell between ethanol and ethanoic acid. 

 

smell

ethanol

 

ethanoic acid

 

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2a1 mark

A liquid alkane was passed over heated aluminium oxide to make ethene.

cracking

What is the purpose of the mineral wool?

2b1 mark

What is this type of chemical reaction called?

2c2 marks

Give a test for ethene.

test .....................................................................................

result ..................................................................................

2d2 marks

What precaution should be taken in the experiment when the heat is removed? Explain.

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3a2 marks

The diagram shows how ethene can be made by cracking liquid alkanes.

cracking-lab-exam-image-no-heat

Indicate with arrows on the diagram where heat is applied.

How did you do?

3b2 marks

Give a chemical test to show the presence of ethene.

test ....................................................................................................

result ....................................................................................................

3c2 marks

Why must the delivery tube be removed from the water before the heat is turned off?

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4a2 marks

Ethene gas was formed by the cracking of a liquid alkane. The diagram shows the apparatus used.

Identify two mistakes in the diagram.

 

cracking-lab-exam-image

 

1 ....................................................................................................

 

 

2 ....................................................................................................

 

4b2 marks

Describe a test to show the presence of ethene.

test ....................................................................................................

result ....................................................................................................

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5a1 mark

A student found a recipe for making elderberry wine by fermentation.

  • 1kg elderberries

  • 0.5kg sugar

  • 10g yeast granules

  • 3dm3 water

The student decided to make some elderberry wine using the apparatus below.

fermenting-mixture


The student carried out the following method.

Step 1 The elderberries were crushed.

Step 2 The crushed elderberries and sugar were added to the water and the mixture was boiled for ten minutes. The crushed elderberries were then separated from the mixture.

Step 3 Yeast was added to the liquid when it had cooled to room temperature.

Suggest the purpose of the airlock in the apparatus.

5b1 mark

What apparatus could be used in Step 1?

How did you do?

5c2 marks

Draw a labelled diagram of the apparatus used to separate the crushed elderberries from the mixture in Step 2.

5d1 mark

Why was the yeast in Step 3 not added until the liquid was at room temperature?

5e3 marks

i) State one observation during the fermentation.

 [1]

 ii) Suggest how the rate of the fermentation reaction could be measured.

 [2]

5f1 mark

Name the method that could be used to separate ethanol from the fermented mixture.

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