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Period 3: Sodium to Argon · CAPE Chemistry Unit 1

53 past-paper questions on Period 3: Sodium to Argon, part of Chemistry of the Elements, from every CAPE Chemistry Unit 1 paper on Quelpr.

Practise Period 3: Sodium to Argon
  1. 3(a)(i)2 marks· CAPE Chemistry Unit 1 · May/June 2019 · Paper 2Write the equation, including state symbols, for the first ionization energy of magnesium.
  2. 3(a)(ii)2 marks· CAPE Chemistry Unit 1 · May/June 2019 · Paper 2Explain why there is a general increase in the first ionization energies across the period from sodium to argon.
  3. 3(a)(iii)2 marks· CAPE Chemistry Unit 1 · May/June 2019 · Paper 2Explain why the first ionization energy of magnesium is greater than that of aluminium.
  4. 3(b)4 marks· CAPE Chemistry Unit 1 · May/June 2019 · Paper 2Write a balanced equation to show the reaction between water and EACH of Na2O and SO3.
  5. 3(c)(i)5 marks· CAPE Chemistry Unit 1 · May/June 2019 · Paper 2Describe an experimental method with expected results to determine the acid-base nature of the following three Period 3 chlorides: NaCl, MgCl2, and SiCl4.
  6. 3(c)(ii)4 marks· CAPE Chemistry Unit 1 · May/June 2019 · Paper 2Write a balanced equation to show the reaction between water and EACH of MgCl2 and SiCl4.
  7. 3(a)(i)3 marks· CAPE Chemistry Unit 1 · May/June 2023 · Paper 2In Table 3, write the formulae for the oxides of the elements in Period 3, excluding chlorine and argon.
  8. 3(a)(ii)3 marks· CAPE Chemistry Unit 1 · May/June 2023 · Paper 2In Table 3, write the oxidation number for the element of EACH oxide in Period 3, excluding chlorine and argon.
  9. 3(a)(iii)2 marks· CAPE Chemistry Unit 1 · May/June 2023 · Paper 2Explain the nature and variation of the oxidation numbers for the elements in the oxides in Table 3.
  10. 3(b)2 marks· CAPE Chemistry Unit 1 · May/June 2023 · Paper 2Write the equation for the reaction between the oxide of phosphorus and cold water.
  11. 3(a)(i)3 marks· CAPE Chemistry Unit 1 · May/June 2024 · Paper 2Write the formulae of the oxides of the elements of the third period, from sodium to sulfur.
  12. 3(a)(ii)3 marks· CAPE Chemistry Unit 1 · May/June 2024 · Paper 2Explain the difference in the oxidation number in the oxides of sodium and aluminium.
  13. 3(a)(iii)a)1 mark· CAPE Chemistry Unit 1 · May/June 2024 · Paper 2State the type of bond present in magnesium chloride.
  14. 3(a)(iii)b)1 mark· CAPE Chemistry Unit 1 · May/June 2024 · Paper 2State the type of bond present in silicon chloride.
  15. 3(a)(iii)c)1 mark· CAPE Chemistry Unit 1 · May/June 2024 · Paper 2State the type of bond present in phosphorus(III) chloride.
  16. 3(a)(i)2 marks· Chemistry · Unit 1 Q3 3(a)(i)Explain, in terms of structure and bonding, why aluminium has a higher melting point than sodium
  17. 3(a)(ii)2 marks· Chemistry · Unit 1 Q3 3(a)(ii)Explain, in terms of structure and bonding, why silicon has the highest melting point in the period
  18. 3(a)(iii)3 marks· Chemistry · Unit 1 Q3 3(a)(iii)Explain, in terms of structure and bonding, why sulfur melts at a higher temperature than phosphorous.
  19. 3(b)(i)2 marks· Chemistry · Unit 1 Q3 3(b)(i)Complete Table 2 by describing the reaction of EACH oxide with water and suggesting a pH value for the resulting liquid.
  20. 3(b)(ii)2 marks· Chemistry · Unit 1 Q3 3(b)(ii)Write the equation which represents the reaction of water with P₄O₁₀.
  21. 3(c)(i)2 marks· Chemistry · Unit 1 Q3 3(c)(i)Write equations to show what happens when EACH of the following chlorides reacts with water: SiCl₄
  22. 3(c)(ii)2 marks· Chemistry · Unit 1 Q3 3(c)(ii)Write equations to show what happens when EACH of the following chlorides reacts with water: AlCl₃
  23. 6(a)1 mark· Chemistry · Unit 1 Q6 6(a)Define the term 'electronegativity'.
  24. 6(a)(i)1 mark· Chemistry · Unit 1 Q6 6(a)(i)State the general trend in atomic radii in moving from left to right across Period 3 (from sodium to argon).
  25. 6(a)(i)5 marks· Chemistry · Unit 1 Q6 6(a)(i)Calculate the oxidation number of the first mentioned element in EACH of the following compounds, and explain the variation in these oxidation numbers: MgCl₂, [Al(OH)₄]⁻, SiF₆²⁻, PO₃³⁻.
  26. 6(a)(i)4 marks· Chemistry · Unit 1 Q6 6(a)(i)State and account for the trend in the values of the atomic radii across the period from Na to Cl.
  27. 6(a)(i)2 marks· Chemistry · Unit 1 Q6 6(a)(i)Account for EACH of the following variations in properties across the period Na to Ar. Electronegativity increases across the period.
  28. 6(a)(ii)5 marks· Chemistry · Unit 1 Q6 6(a)(ii)The trend in the melting points of the elements in Table 3 is related to structure and bonding. Describe the trend in the structure of the elements, and the trend in the bonding of the elements in Table 3.
  29. 6(a)(ii)1 mark· Chemistry · Unit 1 Q6 6(a)(ii)Give a reason for the trend stated in (i) above.
  30. 6(a)(ii)2 marks· Chemistry · Unit 1 Q6 6(a)(ii)Account for EACH of the following variations in properties across the period Na to Ar. Melting point of the elements increases from Na to Si.
  31. 6(b)3 marks· Chemistry · Unit 1 Q6 6(b)Describe the trend in the acid/base character of the oxides of the elements in Period 3.
  32. 6(b)(i)1 mark· Chemistry · Unit 1 Q6 6(b)(i)State the trend in ionic size of the elements from Na to Al.
  33. 6(b)(i)2 marks· Chemistry · Unit 1 Q6 6(b)(i)Describe the structures of the chlorides.
  34. 6(b)(i)3 marks· Chemistry · Unit 1 Q6 6(b)(i)Which structure is exhibited by Magnesium?
  35. 6(b)(ii)2 marks· Chemistry · Unit 1 Q6 6(b)(ii)Describe the differences in the pH of the solutions formed when the chlorides react with water.
  36. 6(b)(ii)7 marks· Chemistry · Unit 1 Q6 6(b)(ii)Explain the following observation. (Include relevant equations to support your answer.)
  37. 6(b)(ii)3 marks· Chemistry · Unit 1 Q6 6(b)(ii)Which structure is exhibited by Silicon?
  38. 6(b)(iii)2 marks· Chemistry · Unit 1 Q6 6(b)(iii)Write the equation for the reaction of silicon(IV) chloride and water.
  39. 6(b)(iii)3 marks· Chemistry · Unit 1 Q6 6(b)(iii)Which structure is exhibited by Sulphur?
  40. 6(c)2 marks· Chemistry · Unit 1 Q6 6(c)Account for the acidic nature of the aluminium chloride solution.
  41. 6(c)3 marks· Chemistry · Unit 1 Q6 6(c)With reference to structure and bonding, account for the variation in melting points shown in the figure.
  42. 6(c)(i)2 marks· Chemistry · Unit 1 Q6 6(c)(i)Describe the difference in the reactions of the chlorides of elements Na, Mg and Al with water.
  43. 6(c)(ii)5 marks· Chemistry · Unit 1 Q6 6(c)(ii)With reference to the ionic radius and electropositivity of the elements, explain the differences in (c) (i) and deduce the type of bonding present in the chlorides. Differences: Type of bonding:
  44. 6(d)(i)2 marks· Chemistry · Unit 1 Q6 6(d)(i)Sketch a similar diagram to Figure 2 given in 6 (c) to illustrate the variation in the electrical conductivity of the elements in Period 3.
  45. 6(d)(ii)3 marks· Chemistry · Unit 1 Q6 6(d)(ii)With reference to structure, explain the variations shown on your sketch in (d) (i) above.
  46. 6(e)(i)2 marks· Chemistry · Unit 1 Q6 6(e)(i)Write an equation to show how EACH of the following reacts with water. P4O10
  47. 6(e)(i)1 mark· Chemistry · Unit 1 Q6 6(e)(i)Describe the reaction which occurs when magnesium is heated in dry chlorine gas.
  48. 6(e)(ii)2 marks· Chemistry · Unit 1 Q6 6(e)(ii)Write an equation to show how EACH of the following reacts with water. PCl5
  49. 6(e)(ii)1 mark· Chemistry · Unit 1 Q6 6(e)(ii)Write an equation to represent the reaction in (e)(i) above.
  50. 351 mark· Chemistry · Unit 1 Q35 35Which of the following oxides of elements in Period 3 are CORRECTLY matched with their acid/base character?
  51. 371 mark· Chemistry · Unit 1 Q37 37Which of the following elements in the third period has the SAME oxidation number in ALL of its known compounds?
  52. 381 mark· Chemistry · Unit 1 Q38 38Which of the oxides is an oxide of sulfur?
  53. 441 mark· Chemistry · Unit 1 Q44 44Which of the following compounds would produce the LOWEST pH when 0.5 mol of it is bubbled into 1 litre of water?

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