iGCSE Chemistry 0620 Extended - 1.1 Solids, liquids and gases- Exam Style Questions Paper 2- New Syllabus
▶️ Answer/Explanation
The change from fixed positions (solid) to mobile (liquid) occurs during melting. On a heating curve, this is the horizontal section where temperature remains constant while the state change occurs. Based on the diagram description, this corresponds to points P and Q.
✅ Answer: (A)
✅ Answer: (A)
▶️ Answer/Explanation
Increasing the temperature of a gas increases the kinetic energy of its particles, causing them to move faster and spread out, thereby increasing the volume. Decreasing the pressure allows the gas particles to expand against less external force, also increasing the volume.
✅ Answer: (D)
✅ Answer: (D)
▶️ Answer/Explanation
According to Boyle’s law, at constant temperature, \(P \propto \frac{1}{V}\), so increasing pressure decreases volume. According to Charles’s law, at constant pressure, \(V \propto T\), so increasing temperature increases volume. Therefore, when pressure is increased volume decreases, and when temperature is increased volume increases.
✅ Answer: (C)
✅ Answer: (C)