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The particle model

The particle model

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Question 12

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

  1. The sublimation of solid iodine (I2I_2I2​) into iodine vapor.
  2. The thermal decomposition of solid calcium carbonate (CaCO3CaCO_3CaCO3​) into calcium oxide (CaOCaOCaO) and carbon dioxide (CO2CO_2CO2​).

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

A

Sublimation of I2I_2I2​: Chemical change (covalent bonds broken); Decomposition of CaCO3CaCO_3CaCO3​: Physical change (ionic bonds broken)

B

Sublimation of I2I_2I2​: Physical change (intermolecular forces overcome); Decomposition of CaCO3CaCO_3CaCO3​: Chemical change (ionic and covalent bonds broken)

C

Sublimation of I2I_2I2​: Physical change (covalent bonds broken); Decomposition of CaCO3CaCO_3CaCO3​: Chemical change (intermolecular forces overcome)

D

Sublimation of I2I_2I2​: Chemical change (intermolecular forces overcome); Decomposition of CaCO3CaCO_3CaCO3​: Physical change (ionic and covalent bonds broken)

Markscheme

The particle model Questions

  1. GCSE
  2. /Physics
  3. /The particle model

29 exam-style questions on OCR GCSE Physics The particle model. Each one has a worked solution and a mark scheme showing where the marks go.

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