Chemistry WCH11 January 2022 Questions & Answers

Questions And Worked Solutions For Chemistry WCH11 January 2022

IAL Chemistry WCH11 January 2022 Questions - Complete Paper (pdf)

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1. Element X is in Group 2 of the Periodic Table and element Y is in Group 7.
   X and Y are not the symbols of the elements.
   (a) What is the formula of the compound formed from X and Y?
   (b) Under what conditions does the compound formed from X and Y conduct electricity?
2. Which of these compounds would you expect to have the highest melting temperature?
3. A drop of an aqueous solution of green copper(II) chromate(VI) is placed in the centre of a strip of damp filter paper.
   The ends of the filter paper are connected to a DC power supply.
   What is observed after a few minutes?
4. Which of these isoelectronic ions has the smallest ionic radius?
5. Which properties of a cation result in the greatest polarising power?
6. Which properties of an anion result in it being most easily polarised?
7. What is the ionic equation for the reaction between aqueous solutions of barium nitrate and sodium sulfate?
8. Which of these molecules is not polar?
9. The concentration of nitrogen dioxide in a sample of air is 0.5ppm.
   What is the percentage of nitrogen dioxide molecules in this sample of air?
10. Ethane reacts with bromine in the presence of ultraviolet radiation.
    (a) What is the equation for the reaction?
    (b) The ultraviolet radiation is needed for
11. All alkanes have the same
12. A single molecule of decane, C₁₀H₂₂, is cracked.
    Which of these mixtures could not be formed?
13. How many structural isomers have the formula C₃H₆C₂?
14. The equation for the complete combustion of hexane is shown.
15. Which pollutant cannot form when alkane fuels are burned in car engines?
16. Iron(III) oxide is reduced by hydrogen in a two-step process
17. Which of these solutions contains the greatest number of ions?
18. Potassium chlorate(V) decomposes on heating to form oxygen.

19. This question is about the amount of water of crystallisation in hydrated magnesium sulfate, MgSO₄xH₂O.
    (a) The value of x in the formula was determined in an experiment.
    Procedure
    Step 1 A crucible was weighed, a spatula measure of hydrated magnesium sulfate was added and the crucible was reweighed.
    Step 2 The crucible containing the hydrated magnesium sulfate was heated using the apparatus shown.
    Step 3 After heating for two minutes, the crucible containing the magnesium sulfate was allowed to cool and was reweighed.
20. This question is about copper and its compounds
21. This question is about alkenes.
    Alkenes contain a carbon to carbon double bond that consists of a σ bond and a π bond.
    (a) Complete the diagram to show the areas of electron density for each bond.
    Label the σ bond and the π bond.
22. This question is about the bonding in the elements of Period 3 in the Periodic Table. The melting temperatures of the Period 3 elements are shown in the table
23. This question is about the ionisation energies of the elements in Period 2 of the Periodic Table.
    (a) The first ionisation energies of the Period 2 elements are shown
    (i) Give an equation that represents the first ionisation energy of lithium.
    Include state symbols.
    (ii) Explain why there is a general increase in the first ionisation energy across the period.
    (iii) Explain why the first ionisation energy of oxygen is lower than that of nitrogen.
24. A 0.210g sample of a volatile organic liquid C is injected into a gas syringe and heated in an oven.
    At 100kPa and 358K, the syringe contains 72.5cm³ of gas

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