Course-topic checklist
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HSC Chemistry
2026 exam predictions
Syllabus preparation and a personal revision plan for your subject.
How to use this for HSC Chemistry
Start with the subject’s course-topic checklist. Mark the areas you need to revise, choose what to practise next and print your revision plan before leaving the planner.
When you find a gap, use the HSC HSC Chemistry practice exams with worked answers to revise it before your next attempt.
Try a free worked-question preview for HSC Chemistry →Sample original practice question
Try a HSC Chemistry question
A chlorine-35 ion, written ³⁵Cl⁻ (atomic number 17), has which numbers of protons, neutrons and electrons?
- 17 protons, 18 neutrons, 18 electrons
- 17 protons, 18 neutrons, 17 electrons
- 18 protons, 17 neutrons, 18 electrons
- 35 protons, 17 neutrons, 36 electrons
Show the worked answer
Answer: A
The atomic number 17 gives 17 protons. Neutrons = 35 − 17 = 18. The ion has a 1− charge, so it has one more electron than protons, which is 18. The option with 17 electrons describes the neutral atom, and the others swap or misuse the mass number.
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What’s included for HSC Chemistry
Personal revision planner
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The HSC Chemistry Mastery Pack includes revision notes, original practice exams, answer guides, practice questions and flashcards. Open the hub for the full contents list and resource previews.
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