IB Physics SL B.1.1 Molecular States Question Bank

Practise comparing solids, liquids and gases through particle spacing, motion, forces, density and energy in exam questions.

Exam points

Compare solids, liquids and gases using particle spacing, motion, intermolecular forces and energy.
Explain density differences between states and the anomalous density behaviour of water using molecular structure.
Relate molecular arrangement to compressibility, flow and average gas spacing.

[Maximum number: 2]

A cylindrical cork of height H and cross-sectional area A is floating stationary in water. Its depth below the water surface is D.

Figure for Question B.1.1—Molecular states question 1 — IB Physics SL

Explain why the density of most substances in a solid state is larger than its density in a liquid state.

Water shows an anomaly with respect to what is stated in (c)(i).
Graph 1 shows the variation with temperature of the density of water between $-100^{\circ} \mathrm{C}$ and $100^{\circ} \mathrm{C}$ . Graph 2 shows the same graph enlarged for the range 0 to $10^{\circ} \mathrm{C}$ .

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B.1.1—Molecular states question 1