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2 marksAtomic Structure and the Periodic Table

CAPE Chemistry Unit 1 · May/June 2022 · Paper 2 · Question 1(b)

Describe the evidence that disproved Dalton's postulate stating that 'Atoms of the same element are identical in mass and properties', and state the modifications made to this postulate.

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  1. 1(a)Complete Table 1 by filling in the blanks for the relative mass, relative charge, or location of electron, proton, and neutron labeled (i), (ii), (iii), and…[4 marks]
  2. 1(c)(i)Define the term 'relative atomic mass'.[2 marks]
  3. 1(c)(ii)Calculate the relative atomic mass of neon containing 90.9% 20Ne, 0.3% 21Ne, and 8.8% 22Ne.[2 marks]
  4. 1(d)(i)Write the s, p electronic configuration of the oxygen atom in its ground state.[1 mark]
  5. 1(d)(ii)Explain how the atomic orbitals in the oxygen atom overlap to form a double covalent bond in the oxygen molecule, O2.[4 marks]
  6. 1(d)(iii)Account for the physical properties that the boiling point of water is higher than expected and ice has a lower density than water.[4 marks]
  7. 1(e)(i)Define the term 'bond energy'.[1 mark]
  8. 1(e)(ii)Using the bond energy values in Table 2, determine the enthalpy change for the reaction: CH4(g) + 2O2(g) -> CO2(g) + 2H2O(g) Show all working.[5 marks]
  9. 1(f)Outline the experimental steps required to determine the enthalpy of neutralization reaction between 50 cm^3 of 1.00 M sodium hydroxide solution and 50 cm^3 of…[5 marks]

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