SIR ADNAN KHAN Organic Chemistry worksheet 1 Q 1 a)Define the term saturated hydrocarbon. …………………………………………………………………………………………………………………………… [1] SIR ADNAN KHAN 4.a) Define the term isomer. ………………………………………………………………………………………………………………………………………………………… [1] b) draw different structures of i) C6H14 ii) C7H14 SIR ADNAN KHAN ORGANIC CHEMISTRY WORKSHEET # 3 Q 1.The flow chart shows the steps involved in the manufacture of poly(propenenitrile). (a) Long chain alkanes such as C17H36 can be cracked to form propene, C3H6. Construct an equation to show the cracking of C17H36 to form propene. ..............................................................................................................................................[1] (b) The structure of propenenitrile is shown. (i) Explain why propenenitrile is unsaturated. .......................................................................................................................................... [1] (ii) Describe a chemical test to show that propenenitrile is unsaturated. .......................................................................................................................................... .......................................................................................................................................... .......................................................................................................................................... (c) Draw part of the structure of poly(propenenitrile). [2] [2] (d) Draw the structure, showing all the atoms and all the bonds, for two isomers with the molecular formula C4H8. [2] (e) The structure of hexene is shown Draw the structure, showing all the atoms and all the bonds, for the product of the reaction of hexene with steam. SIR ADNAN KHAN [1] Organic Chemistry worksheet 4 Q 1. Cyclohexene, C6H10, is a cycloalkene.Cycloalkenes react in a similar way to alkenes. (a) Cyclohexene is an unsaturated hydrocarbon. (i) What is meant by the term unsaturated? .......................................................................................................................................... [1] (ii) What is meant by the term hydrocarbon? ........................................................................................................................................... [1] (b) Construct the equation for the complete combustion of cyclohexene. ............................................................................................................................................. [1] (c) Cyclohexene reacts with bromine.This is an addition reaction. (i) Write the molecular formula of the product of this reaction. ................................................................................................................................................ [1] (ii) What would be observed in this reaction? ................................................................................................................................................ [1] (d) Cyclohexene can be manufactured from hexane as shown in the equation. C6H14 ---------------------------► C6H10 + 2H2 Calculate the mass of cyclohexene that can be made from 258 g of hexane. [Mr of cyclohexene = 82] mass of cyclohexene = ....................................................... g [2] (e) Another cycloalkene has the following percentage composition by mass.C, 88.2%; H, 11.8% (i) Use the percentage composition by mass to show that the empirical formula of this cycloalkene is C5H8. [2] (ii) The cycloalkene has a relative molecular mass, Mr, of 68. Draw the structure of the cycloalkene, showing all of the atoms and all of the bonds. [1] [Total: 10] SIR ADNAN KHAN ORGANIC CHEMISTRY WORKSHEET # 5 Butanoic acid, CH3CH2CH2CO2H, and ethanoic acid, CH3CO2H, are both weak acids. (a) Explain, with the aid of an equation, what is meant by the term weak acid. .................................................................................................................................................. .................................................................................................................................................. [2] (b) Butanoic acid reacts with magnesium. Name the gas formed and describe the chemical test for the gas. gas .......................................................... chemical test .............................................................................................................................. .................................................................................................................................................... [2] (c) Butanoic acid reacts with magnesium carbonate. Give the formula of the magnesium salt formed in the reaction of butanoic acid with magnesium carbonate. ...................................................................................................................................................... [1] (d) Ethanoic acid reacts with ethanol to make an organic compound. Draw the structure, showing all the atoms and all the bonds, of this organic compound. [1] (e) A solution containing 0.172 g of an unknown carboxylic acid, CxHyCO2H, is titrated with 0.100 mol / dm3 aqueous sodium hydroxide. The volume of sodium hydroxide solution needed to exactly neutralise the acid is 23.2 cm3. CxHyCO2H + NaOH ------------------------------► CxHyCO2Na + H2O Calculate the relative formula mass, Mr, of the carboxylic acid and suggest its identity. relative formula mass = ............................... identity of the acid .................................................................................................................... [4] [Total: 10] SIR ADNAN KHAN Q.2. Carboxylic acids are a homologous series of organic compounds.The table shows information about some carboxylic acids. (a) What is meant by the term homologous series? ..................................................................................................................................................... ..................................................................................................................................................... ..................................................................................................................................................... (b) Name the carboxylic acid with the formula C2H5CO2H. [2] ..................................................................................................................................................... (c) Deduce the general formula for a carboxylic acid. [1] ..................................................................................................................................................... (d) It is more difficult to estimate the melting point of butanoic acid than its boiling point. Use the data in the table to explain why. [1] ..................................................................................................................................................... ..................................................................................................................................................... (e) When warmed in the presence of concentrated sulfuric acid, butanoic acid reacts with ethanol to make an ester. Name and draw the structure, showing all the atoms and all the bonds, of this ester. [1] name ......................................................... structure (f) Hexadecanoic acid, C15H31CO2H, is a weak acid. (i) Write an equation to show the dissociation of hexadecanoic acid when dissolved in water. Use the equation to explain the meaning of the term weak acid. [2] ..................................................................................................................................................... ..................................................................................................................................................... ..................................................................................................................................................... (ii) What is the formula of the salt formed when hexadecanoic acid reacts with aqueous sodium hydroxide? [2] ..................................................................................................................................................... [1] [Total: 10] SIR ADNAN KHAN Worksheet # 6 A1. Propanoic acid, C2H5CO2H, is a weak acid. (a) Explain what is meant by the term weak acid. ..................................................................................................................................................... [1] (b) Propanoic acid reacts with sodium carbonate. Write the equation for this reaction. ..................................................................................................................................................... [1] (c) Terylene has the simplified structure shown. (i) State the functional groups on the monomers used to make Terylene. ..................................................................................................................................................... [1] (ii) State the type of polymerisation that occurs when Terylene is made. ..................................................................................................................................................... [1] (iii) State one large scale use of Terylene. ..................................................................................................................................................... [1] (d) Many problems are caused by the disposal of plastics. Describe one method of disposal of a plastic and a problem caused by this method. ..................................................................................................................................................... [1] A2. Proteins are naturally occurring macromolecules. (a) (i) What do you understand by the term macromolecule? ........................................................................................................................................ [1] (ii) Name another naturally occurring macromolecule. ........................................................................................................................................ (b) Proteins can be hydrolysed to amino acids. State a suitable reagent and condition for this hydrolysis. [1] reagent............................................................................................................................. condition .......................................................................................................................... (c) The structure of a section of a protein can be represented as: [2] SIR ADNAN KHAN (i) Describe one similarity in the structure of a protein and the structure of nylon. ....................................................................................................................................... [1] (ii) Describe one way in which the structure of a protein differs from the structure of nylon. ........................................................................................................................................ ........................................................................................................................................ [1] A3.Choose from the following polymers to answer the questions. . Each polymer can be used once, more than once or not at all (a) Which two polymers are polyesters?...................... and .................... [1] (b) Which polymer is used to make both clingfilm and plastic bags?..................... [1] (c) Give the letter of an addition polymer. ............and condensation polymer. .................... [1] (d) Give the letter of a polymer that is a saturated hydrocarbon.................... [1] (e) Which polymer could be part of a protein?................... [1] SIR ADNAN KHAN MARKING SCHEME( worksheet # 6) A1 (C) (d) A2. C) A3.
