Category: Uncategorized

1.23 Oct-1-ene, CH3(CH2)5CH=CH2, can be thermally cracked.   Which combination of compounds W, X, Y and Z can be obtained by thermally cracking oct-1-ene?   W: CH2=CH2         X: CH3CH=CH2                   Y: CH3CH2CH3            Z: CH2=CHCH=CH2   (1)

1.24 Which organic compound would not give either a yellow precipitate when treated with alkaline aqueous iodine or an orange precipitate when treated with 2,4-dinitrophenylhydrazine reagent? (1)

1.17   0.10 g of the volatile liquid X formed 0.025 dm3 of vapour at 100°C and atmospheric pressure. 1 mol of vapour occupies 22.4 dm3 at 0°C and atmospheric pressure. (1) What is the relative molecular mass of X?   Right-click on the button to open the data booklet in a new tab.     

1.18 The equation for the complete combustion of propan-1-ol is shown.   Right-click on the button to open the data booklet in a new tab.        What is the standard enthalpy change of combustion of propan-1-ol, in kJ/mol? (1)

1.29 Three elements, X, Y and Z, have electronic configurations as shown. X 2,6 Y 2,8,1 Z 2,8,7   Which formulae represent compounds that conduct electricity in the liquid state?   1 YZ 2 Y2X 3 Z2X (1)

 1.6 Aluminium carbide, Al4C3, reacts readily with aqueous sodium hydroxide. The two products of the reaction are NaAlO2 and a hydrocarbon. Water molecules are also involved as reactants. What is the formula of the hydrocarbon?   (1)   A CH4 B C2H6 C C3H8 D C6H12  

1.27 How many isomeric esters, including structural isomers and stereoisomers, can be made with the molecular formula C5H10O2, if methanoic acid is one of the two reactants used? (1)

1.30 In this question, all gases can be assumed to behave ideally. A chemist heats a mixture of nitrogen and oxygen gases in a sealed container at a constant temperature until the mixture reaches a dynamic equilibrium containing N2(g), O2(g) and NO(g). N2(g) + O2(g) 2NO(g) The chemist repeats the experiment at the same temperature using the same initial amounts of N2(g) and O2(g), but at a much higher pressure. Which statements about the second experiment at higher pressure are correct? (1)   1 At higher pressure, there are more particles per unit volume. 2 The composition of the equilibrium mixture does not change. 3 There are more collisions per second, so equilibrium is reached faster.  

1.26 How many of the following compounds produce a carboxylic acid on heating under reflux with an excess of hot acidified K2Cr2O7?   CH3CH2CHO CH3COCH3 CH3CH2CH2OH CH3CH(OH)CH3 (1)

 1.10 The equation for the reaction between carbon monoxide and hydrogen is shown. CO(g) + 3H2(g) CH4(g) + H2O(g) What are the units of Kp for this reaction? (1)     Right-click on the button to open the data booklet in a new tab.