Least demanding: Q3, Q8, Q13, Q22, Q26, Q34, Q37, Q40.
Most demanding: Q1 and Q9.
Be cautious with questions like Q7: option B describes a substance correctly but does not answer the question asked.
Most challenging. Cooling curves new to syllabus. Temperature does not change while a substance changes state. C and D most common wrong answers.
Most answered correctly, but some chose B. Correct description of graphite structure but does not explain use as an electrode.
Calculations were challenging. Most common wrong = B, assuming all sodium hydrogencarbonate decomposed.
Some chose C (not correct) but showed understanding of endothermic/exothermic and ?H. A and D rarely chosen.
Half answered correctly; many guessed. A third chose A or B, suggesting they didn’t recognise activation energy remains unchanged.
Nearly all answered correctly. C common wrong: identifies the reduced metal, not the reducing agent.
Tested recall of ammonia from ammonium salts. Recognise alkaline gas. B most common incorrect answer.
Recall of metal reactivity. ~25% did not recall Ca with water or Mg with steam. Some assumed silver reacts with dilute acid ? chose C.
Options B and D not common, but many chose A (wrong). Still recognised correct linkages in polymer.
Addition polymers and repeat units: less than half correct. Some appeared to guess. No strong preference among incorrect options.
Chromatography generally well answered. One-third wrongly chose D, counting ‘red’ spots without checking if same/different dyes.
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