A-LevelChemistryChemical periodicityOct/Nov 2023Paper 1 Q181 Mark
Which row gives the best description of the variations in the melting points and the first ionisation energies of the elements in Period 3 from sodium to argon?
Amelting points: increase up to a peak at aluminium then decrease; first ionisation energies: generally decrease
Bmelting points: increase up to a peak at aluminium then decrease; first ionisation energies: generally increase
Cmelting points: increase up to a peak at silicon then decrease; first ionisation energies: generally decrease
Dmelting points: increase up to a peak at silicon then decrease; first ionisation energies: generally increase
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The correct answer is D. This question tests the candidate's understanding of chemical periodicity 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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