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2.2 Thermal properties and temperature

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Question 273

During evaporation, the most energetic molecules escape from the surface of a liquid into the gas phase.

Which row in the table correctly describes both the change in the temperature of the remaining liquid and the change in the average kinetic energy of the remaining molecules?

Temperature of remaining liquidAverage kinetic energy of remaining moleculesAdecreasesdecreasesBdecreasesremains constantCremains constantdecreasesDremains constantremains constant \begin{array}{|c|c|c|} \hline & \text{Temperature of remaining liquid} & \text{Average kinetic energy of remaining molecules} \\ \hline \text{A} & \text{decreases} & \text{decreases} \\ \hline \text{B} & \text{decreases} & \text{remains constant} \\ \hline \text{C} & \text{remains constant} & \text{decreases} \\ \hline \text{D} & \text{remains constant} & \text{remains constant} \\ \hline \end{array} ABCD​Temperature of remaining liquiddecreasesdecreasesremains constantremains constant​Average kinetic energy of remaining moleculesdecreasesremains constantdecreasesremains constant​​
A

decreases / decreases

B

decreases / remains constant

C

remains constant / decreases

D

remains constant / remains constant

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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