CIE iGCSE Co-Ordinated Science C1.2 Diffusion Exam Style Questions Paper 1
▶️ Answer/Explanation
Sea water is a mixture (not a compound), so its components are not chemically combined and can be separated by physical means; it is a solution (homogeneous mixture), meaning the solute (NaCl) is uniformly distributed throughout the solvent (water).
The components of sea water — sodium chloride and water — each retain their own chemical properties (e.g., water’s boiling point is affected but NaCl can still be recovered), which is characteristic of a mixture rather than a compound.
✅ Answer: (C)
The components of sea water — sodium chloride and water — each retain their own chemical properties (e.g., water’s boiling point is affected but NaCl can still be recovered), which is characteristic of a mixture rather than a compound.
✅ Answer: (C)
▶️ Answer/Explanation
The diagram shows particles spreading out from a small concentrated region into the surrounding space, without any change of state.
This random spreading from high to low concentration is the definition of diffusion, not a state change like evaporation or condensation.
✅ Answer: (B)
This random spreading from high to low concentration is the definition of diffusion, not a state change like evaporation or condensation.
✅ Answer: (B)