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2.2 Thermal properties and temperature

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Question 120
a.

Equal masses of two different liquids, Liquid X and Liquid Y, are initially at 15∘C15^\circ\text{C}15∘C. Each liquid is heated in separate insulated containers using identical 50W50\text{W}50W electrical heaters.

  • For Liquid X, the temperature initially rises at a rate of 1.5∘C1.5^\circ\text{C}1.5∘C per minute, and eventually the temperature stops rising at 78∘C78^\circ\text{C}78∘C.
  • For Liquid Y, the temperature initially rises at a rate of 3.0∘C3.0^\circ\text{C}3.0∘C per minute, and eventually the temperature stops rising at 180∘C180^\circ\text{C}180∘C.

State and explain: (i) which liquid, Liquid X or Liquid Y, has the higher boiling point; (ii) which liquid has the greater thermal capacity.

[4]
b.

A metal-cased electric heater is mounted on the wall of a cold room near the floor. (i) State the name of the process by which thermal energy passes through the metal casing of the heater. (ii) State the two main processes by which thermal energy is transferred from the outside surface of the heater to the rest of the room. (iii) Describe the movement of the air in the room and explain how this movement transfers thermal energy throughout the entire room.

[5]
Markscheme

2.2 Thermal properties and temperature Questions

  1. IGCSE
  2. /Physics
  3. /2.2 Thermal properties and temperature

528 exam-style questions on CIE IGCSE Physics 2.2 Thermal properties and temperature, covering 2.2.1 Thermal expansion of solids, liquids and gases, 2.2.2a Internal energy and temperature, 2.2.2b Specific heat capacity, 2.2.3a Melting, boiling, condensation and solidification, 2.2.3b Evaporation, and 2.2.3c Cooling by evaporation. Each one has a worked solution and a mark scheme showing where the marks go.

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