Course-topic checklist
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QCE Chemistry
2026 exam predictions
Syllabus preparation and a personal revision plan for your subject.
How to use this for QCE 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 QCE QCE Chemistry practice exams with worked answers to revise it before your next attempt.
Try a free worked-question preview for QCE Chemistry →Sample original practice question
Try a QCE Chemistry question
Chlorine-35 (³⁵₁₇Cl) and chlorine-37 are isotopes. Which statement is correct?
- They have the same number of neutrons but different numbers of electrons
- They have the same mass number but different numbers of protons
- They have different chemical properties because their neutron numbers differ
- They have the same electron configuration and chemical properties but different masses
Show the worked answer
Answer: D
Isotopes of one element have the same number of protons and electrons, so the same electron configuration and chemical behaviour; they differ only in neutron number (18 versus 20), which changes mass and mass-dependent physical properties such as density.
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Personal revision planner
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The QCE 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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