IGCSE Chemistry 2020 0620 Specimen paper 2

IGCSE 2020 0620 Specimen paper 2 (pdf)

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1. Amino acids are colourless and can be separated and identified by chromatography.
   What additional apparatus is required to identify the amino acids present in a mixture?
   
2. The diagram shows the diffusion of hydrogen chloride and ammonia in a glass tube.
   The gases are given off by the solutions at each end of the tube.
   When hydrogen chloride and ammonia mix they produce a white solid, ammonium chloride.
   Which line shows where the white solid is formed?
   
3. The diagram shows the structure of an atom.
   Which diagram shows the structure of an isotope of this atom?
   
4. The table shows the structure of different atoms and ions.
   What are the values of W, X, Y and Z?
   
5. Iron is a metal. The structure of iron is described as a lattice of positive ions in a sea of electrons.
   Which of the following statements about iron are correct?
   
6. Which two elements react together to form an ionic compound?
   
7. Ethene is an unsaturated hydrocarbon.
   Which description of the bonding in ethene is correct?
   
8. What is the relative molecular mass, Mr, of butanol?
   
9. The chemical formulae of two substances, W and X, are given.
   W NaAlSi₃O₈
   X CaAl₂Si₂O₈
   Which statements are correct?
   
10. What is the concentration of a solution containing 1.0g of sodium hydroxide in 250cm³ of solution?
    

11. Four students prepared hydrated copper(II) sulfate by adding an excess of dilute sulfuric acid to copper(II) oxide.
    Each student used a different mass of copper(II) oxide.
    After the copper(II) sulfate had crystallised the students dried and weighed the crystals.
    Which student produced the highest percentage yield of hydrated copper(II) sulfate?
    
12. 20cm³ of ethyne, C2H2, are reacted with 500cm³ of oxygen. The equation for the reaction is
    2C₂H₂(g) + 5O₂(g) → 4CO₂(g) + 2H₂O(l)
    What is the total volume of gas remaining at the end of the reaction?
    (all volumes are measured at room temperature and pressure)
    
13. Different metals were tested using the apparatus shown.
    Which pair of metals would produce the largest voltage?
    
14. Three electrolysis cells are set up. Each cell has inert electrodes.
    The electrolytes are listed below.
    cell 1 aqueous sodium chloride
    cell 2 dilute sulfuric acid
    cell 3 molten lead(II) bromide
    In which of these cells is a gas formed at both electrodes?
    
15. The statements refer to the electrolysis of concentrated copper(II) chloride solution.
    1 Electrons are transferred from the cathode to the copper(II) ions.
    2 Electrons move around the circuit from the cathode to the anode.
    3 Chloride ions are attracted to the anode.
    4 Hydroxide ions transfer electrons to the cathode.
    Which statements about the electrolysis of concentrated copper(II) chloride are correct?
    
16. Water can be used to produce hydrogen gas.
    2H₂O → 2H₂ + O₂
    Which row describes bond breaking in the reactant?
    
17. Dinitrogen tetroxide, N₂O₄, breaks down into nitrogen dioxide, NO₂.
    N₂O₄(g) ⇄ 2NO₂(g)
    The reaction is reversible and endothermic.
    Which conditions will give the largest yield of nitrogen dioxide, NO₂?
    
18. The apparatus shown can be used to measure the rate of some chemical reactions.
    For which two reactions would this apparatus be suitable?
    
19. A student investigates the rate of reaction between magnesium and excess sulfuric acid.
    The volume of hydrogen given off in the reaction is measured over time.
    The graph shows the results of two experiments, R and S.
    Which change in conditions would cause the difference between R and S?
    
20. Which of these reactions shows only reduction?
    
21. The red colour in some pottery glazes may be formed as a result of the reactions shown.
    Which substances correctly complete gaps 1 and 2 in the above sentence?
    
22. Acids are compounds which donate protons (hydrogen ions).
    NH₃(aq) + H₂O(l) → NH₄⁺(aq) + OHsup>-(aq)
    Which compound in this equation is behaving as an acid?
    
23. The reactions of four different oxides W, X, Y and Z are shown.
    W reacts with hydrochloric acid but not sodium hydroxide.
    X reacts with both hydrochloric acid and sodium hydroxide.
    Y does not react with either hydrochloric acid or sodium hydroxide.
    Z reacts with sodium hydroxide but not hydrochloric acid.
    Which row shows the correct types of oxide?
    
24. A solution contains barium ions and silver ions and one type of anion.
    What could the anion be?
    A chloride only
    B nitrate only
    C sulfate only
    D chloride or nitrate or sulfate
    
25. A mixture containing two anions was tested and the results are shown below.
    Which anions were present?
    A carbonate and chloride
    B carbonate and iodide
    C sulfate and chloride
    D sulfate and iodide
    
26. Part of the Periodic Table is shown.
    The letters are not the chemical symbols of the elements.
    Which statement about the elements is not correct.
    A W has two electrons in the outermost shell.
    B Y is in Group IV of the Periodic Table.
    C X and Y bond covalently to form a molecule XY₄.
    D Z has more metallic character than Y.
    
27. Astatine is an element in Group VII of the Periodic Table. It has only ever been produced in very small amounts.
    What are the likely properties of astatine?
    
28. The table shows the results of adding three metals, P, Q and R, to dilute hydrochloric acid and to water.
    What is the order of reactivity of the metals?
    
29. Compound X is heated with carbon using the apparatus shown.
    A brown solid is formed in the reaction tube and the limewater turns cloudy.
    What is compound X?
    A calcium oxide
    B copper(II) oxide
    C magnesium oxide
    D sodium oxide
    
30. Zinc is extracted from zinc blende. Zinc blende is an ore of zinc and consists mainly of zinc sulfide.
    One of the steps in the process involves zinc sulfide reacting with oxygen from the air.
    What is the equation for this reaction?
    
31. The diagram shows the carbon cycle.
    Which process is shown by the arrow marked X?
    A combustion
    B photosynthesis
    C respiration
    D transpiration
    
32. A catalytic converter removes harmful gases from motor car exhausts.
    Which reaction does not take place in a catalytic converter?
    
33. The diagram shows some reactions of substance Y.
    Which type of substance is Y?
    A an alcohol
    B a base
    C a catalyst
    D a metal
    
34. Which row shows the conditions for the manufacture of sulfuric acid?
    
35. Air containing an acidic impurity was neutralised by passing it through a column containing substance X.
    What is substance X?
    A calcium oxide
    B sand
    C sodium chloride
    D concentrated sulfuric acid
    
36. In an oil refinery, petroleum is separated into useful fractions.
    The diagram shows some of these fractions.
    What are fractions X, Y and Z?
    
37. Which reaction does not take place in the dark?
    
38. Ethane and ethene are both hydrocarbons.
    Ethane reacts with chlorine and ethene reacts with bromine.
    Which row describes the type of reaction that ethane and ethene undergo?
    
39. Esters are made by reacting an alcohol with a carboxylic acid.
    Which acid and alcohol react together to form the following ester?
    
40. Which structure represents a polymer?

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