Chemical bonding — IGCSE Science - Combined (0653) questions by topic
Dot-and-cross diagrams and property predictions dominate here: constructing the outer-shell electron arrangement for a nitrogen molecule, predicting which properties belong to an ionic compound such as sodium fluoride, and distinguishing covalent bonds between two different elements from those between identical atoms. Construct, predict and identify lead the command words, and construct specifically wants electrons drawn accurately in the shared or transferred positions, not just counted.
This set has 9 real questions from 2025 papers, worth 1 to 9 marks, so a single property tick-box sits beside a full dot-and-cross construction. Submitting each diagram for instant marking suits this topic well, since a missing shared pair or an incorrectly placed electron in a covalent structure is flagged immediately rather than repeated.
May–June 2025, Paper 11
Potassium and iodine react together to form potassium iodide, KI. Which statement is correct? A Ionic bonds form between neutral ions. B The potassium and iodine atoms share a…
Answer this question and get it marked →May–June 2025, Paper 13
What happens when a sodium atom reacts with a chlorine atom? A The sodium atom and chlorine atom lose electrons. B The sodium atom gains an electron and the chlorine atom loses an…
Answer this question and get it marked →Which substance contains a covalent bond between two different elements? A chlorine B potassium chloride C hydrogen D hydrogen chloride
Answer this question and get it marked →May–June 2025, Paper 21
Which statement describes the formation of ions? A Metal atoms gain electrons to form cations and non-metal atoms lose electrons to form anions. B Metal atoms gain electrons to…
Answer this question and get it marked →May–June 2025, Paper 22
Which statement describes a substance that contains covalent bonds? A It is a coloured compound that contains a transition element. B It is a good conductor of electricity when…
Answer this question and get it marked →Which dot-and-cross diagram represents the arrangement of outer-shell electrons in a molecule of nitrogen? Each option shows two overlapping circles labelled N (the two nitrogen…
Answer this question and get it marked →May–June 2025, Paper 23
Which statement about ions is correct? A Atoms lose or gain electrons to form ions. B Ions are held together by strong attraction between negative ions. C Ions form when atoms…
Answer this question and get it marked →May–June 2025, Paper 42
Sodium fluoride, NaF, is an ionic compound. Tick all the boxes that are properties of sodium fluoride. - high boiling point [ ] - insoluble in water [ ] - conducts electricity…
Answer this question and get it marked →May–June 2025, Paper 43
Table 4.1 shows information about three compounds, A, B and C. compound melting point / C boiling point / C electrical conductivity --- --- --- --- A 801 1465 conducts only when…
Answer this question and get it marked →Other IGCSE Science - Combined topics
- Practical skills (96)
- Motion, forces and energy (53)
- Electricity and magnetism (38)
- Waves (32)
- Human nutrition (23)
- Acids, bases and salts (22)
- Organisms and their environment (21)
- Organic chemistry (21)
- Reproduction (20)
- Thermal physics (20)
- Plant nutrition (19)
- The Periodic Table (18)