Revise What’s HARD: Focus on Electrolysis

VCAA VCE Chemistry how difficult is each topic
Click to download PDF version. Numbers in parentheses denote Chapter numbers.

The VCE Chemistry examination is only 22 days away. As you complete at least one practice paper each day and correct them ccording to your revision timetable, you’ll be finding that you’ve already mastered certain topics while others remain difficult.

Patterns emerge in student readiness: each year, electrolysis is the worst-studied topic on the course. Because VCAA has a reputation for asking questions on topics that students repeatedly got wrong in previous years; I decided to test this hypothesis by getting real data from recent examination reports and displaying it on a scatterplot of:

  • how difficult each topic is (% of marks lost) on the x-axis
  • how often the topic is asked (marks per paper) on the y-axis

The results were fascinating. While it’s impossible to say with any certainty which topics will be on the examination this year, previous years’ examination papers have placed more emphasis on the difficult topics (electrolysis, Ka, redox and biofuels). Focus your revision on these topics again this year.

Conclusion: Focus your Chemistry revision this week on your least favourite topics… those topics will probably be worth more marks in the examination!

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