Cambridge IGCSE · 0620 · Paper 4 · Theory (Extended)
Chemistry 0620/43 May/June 2026 past paper
Cambridge IGCSE Chemistry (0620) Paper 4 (Theory (Extended)), variant 3, May/June 2026: the question paper and its official mark scheme, 7 questions worth 80 marks. Free to open, no account needed.
- Questions
- 7
- Marks
- 80
File names: 0620_s26_qp_43 · 0620_s26_ms_43
Topics in this paper
Which syllabus chapters 0620/43 May/June 2026 tested, by marks. Each chapter links to every past-paper question on it.
| Chapter | Questions | Marks |
|---|---|---|
| Chemical reactions | 2 | 19 |
| Organic chemistry | 1 | 16 |
| Acids, bases and salts | 1 | 14 |
| Electrochemistry | 1 | 13 |
| The Periodic Table | 1 | 9 |
| Atoms, elements and compounds | 1 | 9 |
Questions in 0620/43 May/June 2026
- Question 1
A list of symbol equations and word equations, A to I, is shown. A CH2=CH2 …
- Question 2
This question is about elements. (a) Identify an element that: (i) is approximately 21% of clean, dry air (ii) is in Group 1 and Period 4 of the Periodic Table (iii) contains atoms with exactly 24 protons (iv) removes tastes …
- Question 3
This question is about structure and bonding. (a) Sodium oxide is an ionic compound. (i) Complete the dot-and-cross diagrams in Figure 3.1 to show the bonding in sodium oxide. The inner shells of electrons are shown. Show the charge on …
- Question 4
Aqueous hydrogen peroxide, H2O2, decomposes to produce water and oxygen gas. The reaction is catalysed by manganese(IV) oxide. A student adds powdered manganese(IV) oxide to aqueous hydrogen peroxide in a conical flask as shown in Figure 4.1. The mass of …
- Question 5
This question is about the effects of electricity on chemical substances. (a) Concentrated aqueous lithium bromide undergoes electrolysis when electricity is passed through it. The products are: • bromine gas at the anode • hydrogen gas at the cathode. (i) …
- Question 6
This question is about oxides. (a) Aluminium oxide, Al 2O3, is an amphoteric oxide. (i) State the meaning of the term amphoteric. (ii) Aluminium oxide is used to make calcium aluminate. Calcium aluminate contains calcium ions, Ca2+, and aluminate ions, …
- Question 7
This question is about organic chemistry. (a) The equation for the reaction between butane and chlorine is shown. C4H10 + Cl 2 C4H9Cl + HCl (i) Give the general formula of the homologous series which has butane as a member. …
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