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IB Physics HL B 1 1 Molecular States Questions

Practise HL molecular-state questions on gas spacing, density ratios and water’s structural anomaly with particle evidence.

Syllabus
First assessment 2025
Course
Physics HL
Level
HL

Exam points

  • compare solid and gas molecules using spacing, forces, motion and density at equal temperature
  • use a particle model and density ratios to estimate average molecular separation and explain density differences between states

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Study B.1.1—Molecular states conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Physics HL B 1 1 Molecular States Questions question 1

[Maximum number: 3]

Ceres is a dwarf planet in the asteroid belt. The following data are available.

 Mean distance of Ceres from the Sun =4.4×1011 m Mean power output of the Sun =3.8×1026 W\begin{array}{ll} \text { Mean distance of Ceres from the Sun } & =4.4 \times 10^{11} \mathrm{~m} \\ \text { Mean power output of the Sun } & =3.8 \times 10^{26} \mathrm{~W} \end{array}

At low temperatures such as the mean temperature of Ceres, water undergoes a phase change directly from solid to gas.

Compare the molecular conditions of the solid phase and the gas phase at the same temperature.

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