IB DP Chemistry Higher Level (2023 syllabus) · IB ib-chem-hl
S1 Structure 1: Models of the particulate nature of matter
Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).
Practice questions on Structure 1: Models of the particulate nature of matter
- Explain why dissolving a small amount of sugar in water results in no observable increase … (4 marks, Explain)
- Explain why a liquid evaporates at temperatures well below its boiling point, and why the … (4 marks, Explain)
- Explain why the mass spectrum of naturally occurring chlorine shows two groups of peaks, a… (4 marks, Explain)
- Explain why the line emission spectrum of hydrogen consists of series of discrete lines at… (4 marks, Explain)
- Explain why the successive ionisation energies of aluminium show two large increases: one … (4 marks, Explain)
- Explain why the first ionisation energy of oxygen is lower than that of nitrogen, despite … (4 marks, Explain)
- Explain why the first ionisation energy of phosphorus is greater than that of sulfur, even… (4 marks, Explain)
- Explain why the first ionisation energy of beryllium is greater than that of boron. (4 marks, Explain)
- Explain why the molar mass of chlorine gas (Cl₂) is approximately twice the relative atomi… (4 marks, Explain)
- Explain why the empirical formula mass and the molar mass of a compound are not always equ… (4 marks, Explain)
- Explain what is meant by the term 'amount of substance' and outline how the mole concept a… (4 marks, Explain)
- Explain how Avogadro's constant links the macroscopic quantity 'one mole' to the particula… (4 marks, Explain)
- Explain why the pressure exerted by a real gas is lower than that predicted by the ideal g… (4 marks, Explain)
- Explain why, at very high temperatures and low pressures, the behaviour of a real gas appr… (4 marks, Explain)
- Explain why the molar volume of a real gas at high pressure is greater than the value pred… (4 marks, Explain)
- Explain why the ideal gas equation becomes less accurate at low temperatures when applied … (4 marks, Explain)
- Explain why a real gas such as ammonia deviates more significantly from ideal gas behaviou… (4 marks, Explain)
- Explain why the mass of one mole of carbon-12 is exactly 12 g, whereas the molar mass of n… (4 marks, Explain)
- Explain why the third ionisation energy of magnesium is significantly greater than its sec… (4 marks, Explain)
- Explain why two atoms with the same mass number can belong to different elements, and iden… (4 marks, Explain)
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