A-LevelChemistryStates of matterFeb/Mar 2024Paper 1 Q81 Mark
At room temperature and pressure, H₂O is a liquid and H₂S is a gas. What is the reason for this difference of state?
AO has higher first and second ionisation energies than S.
BThe covalent bond between O and H is stronger than the covalent bond between S and H.
CThere is significant hydrogen bonding between H₂O molecules but not between H₂S molecules.
DThe instantaneous dipole-induced dipole forces between H₂O molecules are stronger than the instantaneous dipole-induced dipole forces between H₂S molecules.
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The correct answer is C. This question tests the candidate's understanding of states of matter within the Chemistrysyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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