CIE iGCSE Co-Ordinated Science P2.1.2 Particle model Exam Style Questions Paper 1
▶️ Answer/Explanation
The particle diagrams show the arrangement and spacing of particles in the three states of matter:
- Solid (Y): Particles are tightly packed in a regular, ordered arrangement (lattice). They vibrate about fixed positions but do not move around freely. The diagram labelled Y shows this regular, closely packed arrangement.
- Liquid (Z): Particles are still close together but are not in a regular arrangement. They can slide past each other and move around within the container. The diagram labelled Z shows particles close together but with a disordered arrangement.
- Gas (X): Particles are widely spaced and move rapidly in all directions. They are not held together in a fixed arrangement. The diagram labelled X shows particles far apart with no regular order.
Therefore, Y = solid, Z = liquid, and X = gas. This matches row B: Y (solid), Z (liquid), X (gas).
✅ Answer: (B)
▶️ Answer/Explanation
The remaining statements correctly describe the random motion of gas particles and how gas pressure arises from particle collisions with the container walls.
✅ Answer: (A)
Question
The diagram shows the change in the arrangement of the atoms in a substance that is changing
What is the change of state?
A boiling
B condensation
C melting
D solidificatio
▶️Answer/Explanation
Ans 😀
Question
A glass jar in a warm room has a metal lid that is easy to remove.
The jar with the lid on is left in a refrigerator overnight.
In the morning, the lid of the jar is difficult to remove.
Which statement is an explanation of what happens when the jar is in the refrigerator?
(A) The glass jar contracted more than the metal lid.
(B) The metal lid contracted more than the glass jar.
(C) The glass jar expanded more than the metal lid.
(D) The metal lid expanded more than the glass jar.
▶️Answer/Explanation
Ans: B