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An investigator analyzes the behavior of particles during two distinct processes:

The sublimation of solid iodine ( $I_2$ ) into iodine vapor.
The thermal decomposition of solid calcium carbonate ( $CaCO_3$ ) into calcium oxide ( $C a O$ ) and carbon dioxide ( $CO_2$ ).

Which of the following rows correctly identifies the type of change and the microscopic bonds or forces primarily overcome during each process?

Sublimation of $I_2$ : Chemical change (covalent bonds broken); Decomposition of $CaCO_3$ : Physical change (ionic bonds broken)

Sublimation of $I_2$ : Physical change (intermolecular forces overcome); Decomposition of $CaCO_3$ : Chemical change (ionic and covalent bonds broken)

Sublimation of $I_2$ : Physical change (covalent bonds broken); Decomposition of $CaCO_3$ : Chemical change (intermolecular forces overcome)

Sublimation of $I_2$ : Chemical change (intermolecular forces overcome); Decomposition of $CaCO_3$ : Physical change (ionic and covalent bonds broken)

The particle model Questions

Practise OCR GCSE Physics The particle model with exam-style questions for Foundation and Higher tier. 39 questions, matched to the OCR GCSE Physics (J249) specification and written in Paper 1 and Paper 2 (Foundation Tier) or Paper 3 and Paper 4 (Higher Tier) style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.