中文（繁體）
中文（简体）
English
IGCSE Chemistry Past Papers & Drilling (Paper 2): Moles, Ionic Bonds, Electrolysis
TUTORZONE ORIGINAL DRILLING MOCK · CAMBRIDGE IGCSE CHEMISTRY (0620) PAPER 2
Written to the Cambridge 0620 syllabus: Paper 2 Multiple Choice (Extended), 40 marks, 45 min, 30% (40 four-option items); plus Paper 4 Theory (80, 50%) and Paper 5/6 Practical (40, 20%). This is a Paper 2 drilling mock: 6 questions demonstrating the 40-mark core concepts, with answers and techniques.
What is in IGCSE Chemistry (0620) Paper 2?
Direct answer: Paper 2 Multiple Choice (Extended), 40 marks, 45 min, 30% (40 four-option items).
Assessment at a glance (2027)
| Component | Content | Weighting | Duration |
|---|---|---|---|
| Paper 2 (Multiple Choice, Extended) | 40 four-option items, 40 marks | 30% | 45 min |
| Paper 4 (Theory, Extended) | Short-answer and structured, 80 marks | 50% | 1 h 15 min |
IGCSE Chemistry Paper 2 drilling technique: 40 questions in 45 minutes is about 68 s each. Tools: sum Mr, n = m / Mr, reduction at the cathode, oxidation at the anode; balance charge in ionic equations.
How this paper was built
This is a TutorZone original drilling mock: the questions follow the Cambridge 0620 structure (Paper 2, 40 marks, 30%) and the answers are our own, not Cambridge past papers or marking references.
Every numeric answer was recomputed programmatically.
Pacing
| Section | Marks | Suggested time | What to do first |
|---|---|---|---|
| Paper 2 (Multiple Choice, Extended) | 30% | about 68 s per question | core + supplement content |
| Paper 4 (Theory, Extended) | 50% | about 9 min per question | formulae + explanation |
How are moles found?
Direct answer: n = m / Mr; 44 g of CO2 (Mr 44) gives 1 mol.
Paper 2: concept drilling (6 demonstrated)
Sum Mr; n = m / Mr; reduction at cathode, oxidation at anode.
Question 1 (7 marks)
Calculate the relative molecular mass of CO2 (C = 12, O = 16).
Question 2 (7 marks)
How many moles are in 44 g of CO2 (Mr = 44)?
Question 3 (6 marks)
Explain how an ionic bond forms.
Question 4 (7 marks)
Explain what happens at the cathode in electrolysis.
Question 5 (6 marks)
Explain the difference between exothermic and endothermic reactions.
Question 6 (7 marks)
State two features of a homologous series.
What happens at the electrodes in electrolysis?
Direct answer: reduction at the cathode (cations gain electrons); oxidation at the anode (anions lose electrons).
Paper 2 answers
Question 1
Mr = 12 + 16×2 = 44 (7).
Question 2
n = m / Mr = 44 / 44 = 1 mol (7).
Question 3
A metal atom loses electrons to form a cation, a non-metal gains electrons to form an anion, held by electrostatic attraction (6).
Question 4
The cathode is negative, so cations gain electrons there (reduction) (7).
Question 5
Exothermic reactions release energy and raise the temperature (3); endothermic reactions absorb energy and lower it (3).
Question 6
(1) Similar chemical properties (3.5). (2) Successive members differ by CH2 (3.5).
Which topics does this paper drill?
Direct answer: relative molecular mass, mole calculations, ionic bonding, electrolysis, energy change and homologous series.
Where these marks are usually lost
| Mistake | What it looks like | What it costs | Instead |
|---|---|---|---|
| Mr not multiplied | CO2 as 28 | Two oxygens: 12+16×2 | 44 |
| Mole formula inverted | n = Mr/m | n = m/Mr | 1 mol |
| Electrode reactions swapped | Cathode oxidises | Cathode reduces, anode oxidises | cathode reduces |
How to use this paper
First drill: the full 45 minutes at the 40-question pace (this mock demonstrates 6 core items).
Mark it: check formulae and mole calculations.
Second drill: redo three to seven days later, aiming for a faster finish.
What should I do after drilling this paper?
Direct answer: log answers with wrong Mr or mole formulas; redo in three to seven days; and drill Paper 4 theory.
FAQ
Is this a Cambridge past paper?
No. The questions and answers are TutorZone originals, not Cambridge past papers or marking references.
What is in IGCSE Chemistry Paper 2?
Multiple choice (Extended), 40 marks, 45 min, 30%, covering core and supplement content.
How are moles found?
n = m / Mr (mass / relative molecular mass).
Official references
| Resource | What to check |
|---|---|
| Cambridge IGCSE Chemistry 0620 page | Confirm the paper marks and times |
| https://www.tutorzone.com.hk/en-igcse-chemistry-0620-paper-4-mock-2027/ | IGCSE Chemistry Paper 4 drilling mock |
Related: practice area · IGCSE Chemistry Paper 4 drilling mock
Next step: find a tutor / register as a tutor
After drilling, the hard part is telling a conceptual error from a writing error. Tell us the year group, the school and your available times, and TutorZone will match you with a tutor who knows the HKEAA assessment requirements.
Demand for tutors in this subject is steady, and those who can explain the marking scheme and where marks are won are especially sought after. Register free; you pay only when a match succeeds.
