Olympiad · Mock test
Formulae and Ions: Challenge Paper
An Olympiad-style paper: 10 questions in 20 minutes, +3 for a right answer and -1 for a wrong one. Formulae with polyatomic ions and brackets, counting atoms, valency from a formula, and ions from atoms. Every answer has a worked solution that names the usual slip.
ChemistryHigh School (9–10)General
- questions
- 10
- minutes
- 20
- marks
- 30
- right / wrong
- +3 / −1
questions
minutes
marks
right / wrong
The clock starts when you press Begin, after the instructions.
Exam pattern
| Part | Questions | Marks |
|---|---|---|
| All questions | 10 | 30 |
Marking
- Right answer: +3
- Wrong answer: −1
- Left blank: 0
Time
20 minutes on one clock, from when you begin.
Before you start
- It runs like an online exam: one question at a time, with a palette showing what you have answered, skipped or marked for review.
- The clock starts when you press Begin the test, after you have read the instructions, and keeps running even if you reload or leave. At zero, your saved answers are submitted.
- Leaving the test window is recorded, and your teacher can see it.
- Your score, the answers and the explanations show when you finish, with where you stand among everyone who has taken it.