CIE iGCSE Co-Ordinated Science P2.1.1 States of matter Exam Style Questions Paper 2
▶️ Answer/Explanation
Arrow Q shows particles becoming more ordered and closely packed, going from a disordered liquid arrangement to a fixed regular one — this is solidification, a change from liquid to solid.
Only the row pairing P with evaporation and Q with solidification matches the diagrams.
✅ Answer: (B)
Question
When solids, liquids and gases are heated, they expand. What is the order of the expansions of solids, liquids and gases, from smallest to largest?
(A) gas → liquid → solid
(B) liquid → gas → solid
(C) solid → gas → liquid
(D) solid → liquid → gas
▶Answer/Explanation
Ans: D
Question
What is the definition of efficiency?
A \(\frac{energy \\\ input}{useful \\\ energy \\\ output} \times 100\) %
B \(\frac{energy \\\ input}{wasted \\\ energy} \times 100\) %
C \(\frac{useful \\\ energy \\\ output}{energy \\\ input} \times 100\) %
D \(\frac{wasted \\\ energy}{energy \\\ input} \times 100\) %
▶️Answer/Explanation
Ans : C
Question
Which labelled arrow on the diagram represents condensation?
▶️Answer/Explanation
Answer: A) A
Explanation: Condensation is the process where a gas turns into a liquid. In the diagram, arrow A represents this phase change.
Question
When equal masses of solids, liquids and gases are heated equally, they expand by different amounts. Which list shows the relative order of the magnitudes of the expansion, starting with the state of matter that expands the least?
A. gas, liquid, solid
B. liquid, gas, solid
C. liquid, solid, gas
D. solid, liquid, gas
▶️Answer/Explanation
Answer: D
Explanation: Solids expand the least when heated because their particles are tightly packed in a fixed arrangement. Liquids expand more than solids as their particles are less tightly packed. Gases expand the most because their particles are far apart and move freely, allowing for significant expansion when heated.