A-LevelPhysicsTemperature9702/12 · Oct/Nov 2010 · Q181 Mark
Below are four short paragraphs describing the molecules in a beaker of water at 50°C. Which paragraph correctly describes the molecules?
AThe molecules all travel at the same speed. This speed is not large enough for any of the molecules to leave the surface of the water. There are attractive forces between the molecules.
BThe molecules have a range of speeds. Some molecules travel sufficiently fast to leave the surface of the water. There are no forces between the molecules.
CThe molecules have a range of speeds. Some molecules travel sufficiently fast to leave the surface of the water. There are attractive forces between the molecules.
DThe molecules have a range of speeds. The fastest molecules are unable to leave the surface of the water. There are attractive forces between the molecules.
✓ Correct answer
C: The molecules have a range of speeds. Some molecules travel sufficiently fast to leave the surface of the water. There are attractive forces between the molecules.
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