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Calcium carbonate is a solid. Carbon dioxide is a gas. Fig. 8.2 shows diagrams of a solid, liquid and gas. A B C Fig. 8.2 Explain, in terms of particle separation and particle arrangement, why A represents solid calcium carbonate and C represents carbon dioxide gas. A represents solid calcium carbonate because C repres...
See it on the paper →Describe what happens to the movement of water particles during melting.
See it on the paper →Describe two differences between the arrangement and motion of atoms in molten copper and the arrangement and motion of atoms in solid copper. arrangement motion
See it on the paper →Why does this happen?
See it on the paper →Ethanol is a liquid at room temperature. Describe the motion and separation of the particles in ethanol. motion separation
See it on the paper →Hydrogen, oxygen and water are all covalent molecules with low melting and boiling points. Explain why these covalent molecules have low melting and boiling points.
See it on the paper →While the student is conducting the experiment, the ice in the beaker melts into liquid water. Compare the arrangement and motion of molecules in a solid to the arrangement and motion of molecules in a liquid. arrangement motion
See it on the paper →Carbon is a solid and carbon dioxide is a gas. Describe the differences between a solid and a gas using ideas about particle separation and particle motion. particle separation particle motion
See it on the paper →State why the start line is drawn using pencil instead of ink.
See it on the paper →Which statement describes the arrangement of particles in a solid?
See it on the paper →When discussing particles in solids, liquids and gases candidates should be encouraged to consider three aspects: motion, separation and arrangement. In this question relating specifically to a model only the latter two were relevant as the model did not show the motion of the particles and so provided no evidence in this regard. Therefore, candidates should have responded with the idea that parti...
— Examiner report, May/June 2025, 0654/32 Q8(c) (Cambridge)
Not all candidates understood to focus on the movement of water molecules during melting. The idea that particles would move faster was well understood, but fewer candidates were able to describe the movement of particles in a liquid, with many describing the movement of particles in a gas.
— Examiner report, May/June 2025, 0654/41 Q5(b) (Cambridge)
Many candidates gave clear descriptions of the differences between a solid and a gas.
— Examiner report, October/November 2023, 0654/33 Q11(b) (Cambridge)
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