Home > Chemistry O LevelVariant 2 Feb/Mar 2016 Report a question What’s wrong with this question? You cannot submit an empty report. Please add some details. 0% Variant 2 Feb/Mar 2016 1. Which reaction does not occur in the extraction of aluminium? 2Al2O3 + 3C โ 4Al + 3CO2 C + O2 โ CO2 2O2โ โ O2 + 4eโ Al3+ + 3eโ โ Al 2. Concentrated hydrochloric acid is a strong acid. What is meant by the terms โstrongโ and โacidโ? D C B A 3. The diagram shows an energy level diagram for a reaction. The diagram shows that the reaction is ……1…… . Increasing the temperature increases the rate of reaction. A reason for this is that the ……2……. . Which words correctly complete gaps 1 and 2? B A C D 4. Magnesium nitride is formed when magnesium burns in air. Magnesium nitride is an ionic compound. What is the formula of magnesium nitride? Mg2N3 MgN2 Mg3N2 Mg2N2 5. The electrolysis of concentrated hydrochloric acid is shown. Which statement describes what happens to the electrons during the electrolysis? They move through the circuit from positive to negative. They are added to hydrogen ions. They move through the solution from negative to positive. They are added to chloride ions. 6. The statements below are about the alcohol homologous series. The alcohols have the same ……1…… formula. The alcohols have ……2…… chemical properties because they have the same ……3…… . The melting points of the alcohols ……4…… as the number of carbon atoms increases. Which words correctly complete gaps 1โ4? C B D A 7. Which structure represents a compound that dissolves in water to form an acidic solution? C B A D 8. Which oxide is amphoteric? sodium oxide calcium oxide carbon monoxide aluminium oxide 9. An element does not conduct electricity and exists as diatomic molecules. Where in the Periodic Table is the element found? A B D C 10. In the Periodic Table, how does the metallic character of the elements vary from left to right across a period? It stays the same. It increases. It increases then decreases. It decreases. paraffin fuel oil naphtha alcohol 12. Which quantities of chemicals will react exactly with no reactants left over? 12 g of carbon and 12 g of oxygen 24 g of magnesium and 16 g of oxygen 12 g of magnesium and 16 g of oxygen 12 g of carbon and 48 g of oxygen 13. Fertilisers are used to provide three elements needed to increase the yield of crops. Which two compounds would provide all three of these elements? ammonium nitrate and potassium sulfate ammonium nitrate and calcium phosphate potassium nitrate and calcium phosphate potassium nitrate and potassium sulfate 14. Which statement about catalysts in chemical reactions is not correct? Catalysts increase the rate of the reaction. Catalysts increase the energy of the reacting particles. Catalysts are not used up in the reaction. Catalysts lower the activation energy. 15. A sample of a green food colouring was separated into its component colours using paper chromatography. The results obtained are shown. What is the Rf value of the blue spot? 0.45 2.20 1.10 0.90 16. Iron is extracted from hematite in the blast furnace. The hematite contains silicon(IV) oxide (sand) as an impurity. What reacts with this impurity to remove it? carbon dioxide slag carbon calcium oxide 17. Which compounds are alkanes? X and Y W and Z W and X Y and Z 18. Which piece of apparatus is used to measure variable quantities of liquid in a titration? C D A B 19. A substance is heated with aluminium foil in aqueous sodium hydroxide. A gas is produced which turns damp, red litmus paper blue. Which anion is present in the substance? nitrate sulfate carbonate iodide 20. The diagram shows how water is treated to make it suitable for drinking. What happens in stage 2? evaporation filtration distillation condensation 21. Which row describes an endothermic reaction? D B A C 22. Which pollutant gas can be produced as a result of incomplete combustion of octane, C8H18? methane carbon carbon monoxide carbon dioxide 23. Brass is an alloy of two metals. Which row gives a correct use for the two metals from which brass is made? A D B C 24. Why does a farmer put lime (calcium oxide) on the soil? to make the soil less alkaline to act as a fertiliser to make the soil less acidic to kill pests 25. Zinc is extracted from zinc blende by roasting it in air to form zinc oxide. The zinc oxide is then heated with carbon to form zinc. The equations for the reactions are shown. 1 2ZnS + 3O2 โ 2ZnO + 2SO2 2 ZnO + C โ Zn + CO Which statement about reactions 1 and 2 is not correct? In reaction 1 the oxidation state of sulfur increases and it is oxidised. In reaction 1 the oxidation state of zinc increases and it is oxidised. In reaction 2 the oxidation state of zinc decreases and it is reduced. In reaction 2 the carbon acts as a reducing agent and it is oxidised. 26. One method of preventing the rusting of iron is to keep oxygen away from the surface of the metal. Which way of rust prevention does not use this method? connecting the iron to a more reactive metal covering the iron with plastic coating the iron with grease painting the iron 27. Which structure represents the sodium chloride lattice? D C A B 28. Nitrogen monoxide is produced in a car engine when petrol is burnt. The gases from the car engine are passed through a catalytic converter. In the catalytic converter the nitrogen monoxide reacts with carbon monoxide to form nitrogen and carbon dioxide. Which statement is not correct? Carbon monoxide is oxidised in the catalytic converter. Nitrogen monoxide is formed by the reaction of nitrogen and oxygen. Nitrogen monoxide is reduced in the catalytic converter. Carbon monoxide is produced by the complete combustion of petrol. 29. X and Y are isotopes of the same element. Which statement is correct? X and Y have atoms with the same number of outer shell electrons. X and Y have atoms with the same nucleon number. X and Y have atoms with different numbers of electron shells. X and Y have different chemical properties. 30. The partial structure of an addition polymer is shown. What is the structure of the monomer used to make this polymer? C D A B 31. The elements in a group of the Periodic Table show the following trends. 1 The element with the lowest proton number has the lowest reactivity. 2 All the elements in the group form basic oxides. 3 The density of the elements increases down the group. 4 The melting point of the elements decreases down the group. In which group are the elements found? VI VII IV I 32. A salt is made by adding an excess of an insoluble metal oxide to an acid. How is the excess metal oxide removed from the mixture? filtration distillation crystallisation chromatography 33. Which statement about polymers is correct? Condensation polymers only exist in nature. Forming addition polymers produces only one product. Condensation polymers can all be hydrolysed to give amino acids. Addition polymers are all biodegradable. 34. In which row are the substances correctly classified? C B A D 35. Two gas jars are set up as shown. The lid is removed and the gas jars are left to stand. After some time the contents of both gas jars are brown. Which process causes this to happen? diffusion filtration condensation evaporation 36. The reaction below is called the โthermite reactionโ. 2Al + Fe2O3 โ 2Fe + Al2O3 Which pair of substances reacts in a similar way? Fe and MgO Zn and Al2O3 Mg and CuO Fe and ZnO 37. Which substance could not be used as a fuel to heat water in a boiler? hydrogen methane ethanol oxygen 38. A reversible reaction is shown. Which statement about an equilibrium mixture of NO2 and N2O4 is correct? The rates of formation and decomposition of N2O4re not the same. If the temperature is increased the amount of N2O4 increases. If the pressure is decreased the amount of N2O4 increases. The decomposition of N2O4is an endothermic reaction. 39. Which molecule contains only single covalent bonds? N2 O2 CO2 Cl2 40. What is a property of concentrated sulfuric acid but not of dilute sulfuric acid? It reacts with metals to give a salt and hydrogen. It is a dehydrating agent. It neutralises alkalis. It produces a white precipitate with barium nitrate. Your score is The average score is 0% 0% Restart quiz