CIE iGCSE Co-Ordinated Science C1.1 Solids, liquids and gases Exam Style Questions Paper 2
▶️ Answer/Explanation
Solids have fixed particle positions and cannot be compressed, while gas particles are far apart and can be squeezed closer together, so compressibility is a useful distinguishing property.
Solids have a definite melting point at which they turn to liquid, whereas a gas has no melting point (it would need to be cooled to become a liquid, then further to a solid), so melting point also distinguishes them.
Flammability depends on the chemical identity of the substance, not on its physical state, so it cannot be used to distinguish solids from gases.
✅ Answer: (A)
Solids have a definite melting point at which they turn to liquid, whereas a gas has no melting point (it would need to be cooled to become a liquid, then further to a solid), so melting point also distinguishes them.
Flammability depends on the chemical identity of the substance, not on its physical state, so it cannot be used to distinguish solids from gases.
✅ Answer: (A)
▶️ Answer/Explanation
\(\text{CO}_2\), Ne and \(\text{N}_2\) are all gases at room temperature, with widely spaced particles.
Zn (zinc) is a solid metal at room temperature.
Particles in a solid are packed tightly together in a fixed arrangement, closer than in a gas.
✅ Answer: (D)
Zn (zinc) is a solid metal at room temperature.
Particles in a solid are packed tightly together in a fixed arrangement, closer than in a gas.
✅ Answer: (D)
Question
The boiling point of ammonia is –33ºC. The temperature of a sealed flask containing ammonia is changed from –35º C to –30ºC.
Which row describes and explains the type of change that happens in the flask?
▶️Answer/Explanation
Ans : C
Question
Which properties are used to distinguish between solids and gases?
1 compressibility
2 melting point
3 flammability
(A) 1 and 2 only
(B) 1 and 3 only
(C) 2 and 3 only
(D) 1, 2 and 3
▶️Answer/Explanation
Ans: A
Question
Which change is represented by the diagram?
(A) condensation
(B) diffusion
(C) evaporation
(D) solidification
▶️Answer/Explanation
Ans: B