PAKTURK INTERNATIONAL SCHOOLS & COLLEGES General Certificate of Education Ordinary LevelWORK SHEET ORGANIC CHEMISTRYSubject: CHEMISTRY Subject Code: 5070/ Paper: ALL Class: O Level THREETime: 1 hrStudent Name: ________________________________READ THESE INSTRUCTIONS FIRST

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PAKTURK INTERNATIONAL SCHOOLS & COLLEGESCambridge Ordinary Level

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1- When a volcano erupts, which gas is produced in significant amounts?A carbon monoxideB methaneC ozoneD sulfur dioxide2- What is the partial structure of the polymer formed by the polymerisation of propene,CH3CH=CH2?

3-The structural formulae of some organic compounds are shown below.

4-Compound X and compound Y combine to form a polymer.

Which of the statements about the polymer and its formation is not correct?A Ammonia is formed during the production of the polymer.B Hydrolysis of the polymer produces X and Y.C The polymer is a polyamide.D The polymer is formed by a condensation reaction.5- A liquid reacts with each of sodium carbonate, potassium hydroxide and ethanol.What is the liquid?A aqueous ammoniaB ethanoic acidC ethyl ethanoateD sodium hydroxide6-Which information is correct regarding the formation of ethanol by the process of fermentation?

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8- The diagram shows the partial structure of Terylene.

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11-Which polymer contains only three elements?A proteinB poly(ethene)C poly(propene)D starch12- Which organic compound requires the least oxygen for the complete combustion of one mole ofthe compound?A- C3H7OH B- C3H7COOH C- C3H8 D- C4H813- Which statement about methanol is correct?A It can be oxidised to form methanoic acid.B It is a constituent of alcoholic drinks.C It is formed by fermentation.D Its fully displayed structural formula is14-

15- Which compound has more than two carbon atoms per molecule?A ethanoic acidB ethanolC etheneD ethyl ethanoate16- Which process would destroy the bacteria in water?A chlorinationB desalinationC filtrationD treatment with carbon17-One mole of magnesium is dissolved in excess aqueous ethanoic acid, CH3COOH.How many moles of hydrogen, H2, will be produced?A 0.5 B 1 C 2 D 418- The section of a polymer chain is shown.

Which molecule would produce this polymer and by which type of polymerisation?

19- - An aqueous solution of a compound of formula C2H4O2 reacts with sodium carbonate, liberating carbon dioxide.What is the structural formula of the compound?

20- 10- 'Meta-fuel', C8H16O4, is a fuel used in camping stoves.What is the equation for its complete combustion?A C8H16O4 + 2O2 8C + 8H2OB C8H16O4 + 5O2 8CO + 8H2OC C8H16O4 + 10O2 8CO2 + 8H2OD C8H16O4 + 8O2 4CO2 + 4CO + 8H2O

PAPER-2 THEORYGermanium, Ge, is an element in Group IV of the Periodic Table. Some of its chemistryresembles that of carbon.(a) How many electrons does an atom of germanium have in its outer shell?.......................................................................................................................................................................... [1](b) Germanium forms a range of saturated compounds with hydrogen. These compoundsresemble the alkanes.(i) Predict the general molecular formula for these compounds.............................................................................................................................................................................[1](ii) Germanoethane, Ge2H6, has a similar structure to ethane.Draw the full structural formula for germanoethane.

[1](iii) Hydrochloric acid reacts with magnesium germanide, Mg2Ge, to formgermanomethane, GeH4, and magnesium chloride.Write an equation for this reaction.

[1](c) Germanium(IV) oxide, GeO2, is an amphoteric oxide.What do you understand by the term amphoteric?........................................................................................................................................................................... [1](d) An aqueous solution of germanium(II) chloride reduces iron(III) ions to iron(II) ions.Describe a test for iron(II) ions and give the result.test ........................................................................................................................................................................result...................................................................................................................................................................[2] [Total: 7]2- Carboxylic acids are a homologous series containing the CO2H group.The table shows some properties of the first four carboxylic acids in the series.

(a) (i) Describe how the density of these carboxylic acids varies with the number ofcarbon atoms in the molecule.............................................................................................................................................................................................. [1](ii) Name the carboxylic acid with the molecular formula C2H4O2.............................................................................................................................................................................................. [1](iii) Draw the structure of propanoic acid, showing all atoms and bonds.

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(b) The next carboxylic acid in this homologous series is pentanoic acid.Pentanoic acid has five carbon atoms.(i) Deduce the molecular formula for pentanoic acid........................................................................................................................................................................... [1](ii) Suggest a value for the boiling point of pentanoic acid.

.............................................C [1]

(c) Butanoic acid, C3H7CO2H, reacts with sodium to form a salt and a gas.(i) Name the gas......................................................................................... [1](ii) Give the formula of the salt............................................................................................................................................................................ [1](d) Esters are formed when carboxylic acids react with alcohols.The reaction is catalysed by hydrogen ions.(i) Describe and explain the effect of a catalyst on reaction rate........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... [2](ii) State one commercial use of esters............................................................................................................................................................................ [1](iii) The structure of an ester is shown below.

Name this ester.

............................................................................................................................................................................[1] [Total: 11]3- Proteins, carbohydrates and fats are natural macromolecules.The partial structure of a protein is shown below

(a) Name the linkage that joins the monomer units in a protein.............................................................................................................................................................................[1](b) Name a synthetic polymer that has the same linkage as a protein.............................................................................................................................................................................[1](c) Proteins are hydrolysed to give a mixture of colourless amino acids.Describe, with the aid of a labelled diagram, how paper chromatography can be used toidentify the amino acids present in a mixture of amino acid

............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................[4](d) Carbohydrates can be hydrolysed.Name the class of compound formed when carbohydrates are hydrolysed............................................................................................................................................................................[1](e) The diagram shows the structure of a simple fat.

(i) This fat is polyunsaturated.What is the meaning of the term polyunsaturated?............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................[2](ii) Describe a chemical test to show that the fat is unsaturated.name of reagent .....................................................................................................................................................result of test .......................................................................................................................................................[2](iii) Name a synthetic macromolecule that contains the same linkage as fats............................................................................................................................................................................[1] [Total: 12]

Paper-4 Alterative to Practical.1(a) Using the general formula for the homologous series of alkanes, suggest the formula for bothhexane and heptane, the sixth and seventh members of the alkane series respectively.hexane.................................................heptane................................................. [1](b) A mixture of hexane (b.p. 69 C) and heptane (b.p. 89 C) may be separated by fractionaldistillation.The diagram below shows a fractionating column attached to a flask which contains a mixtureof hexane and heptane.Complete the diagram by adding further apparatus to enable each alkane to be collected.

2(a) (i) Draw the structure of ethanol showing all the atoms and bonds.

[1](ii) Give the name and formula of the carboxylic acid that can be made by the oxidationof ethanol.name ......................................................................................................................................................................................formula ...................................................................................................................................................................................[1](iii) Suggest an oxidising agent that can be used and the colour change seen duringthe course of the reaction in (ii).oxidising agent .......................................................................................................................................................................colour change ......................................................................................................................................................................... [3]A student separates propanoic acid (b.p. 141 C) and butanoic acid (b.p. 164 C) using theapparatus shown below.

(b) (i) The student has left out one item in setting up the apparatus.Draw this item on the diagram in the correct position.

[1]Now that this addition has been made the apparatus is ready for the separation of thetwo acids.(ii) Name apparatus A.............................................................................................................................................................................[1](iii) What is the purpose of apparatus A?............................................................................................................................................................................[1](iv) Apparatus B is a condenser. On the diagram, indicate both where water enters andwhere water leaves the apparatus. [1](i) What is the reading on the thermometer when the first few drops of distillate appearin C?............................................. C [1](ii) Name this distillate.............................................................................................................................................................................[1](iii) How does the student know when all of this compound has distilled over?............................................................................................................................................................................[1] [Total: 12]