Physics 5054 · O Level · Melting, boiling and evaporation

Melting, boiling and evaporation — practice question

Steam at $110^\circ\text{C}$ condenses on a surface, forming water droplets at $100^\circ\text{C}$. What occurs after the steam makes contact with the surface?

  • AThe molecules slow down and absorb energy from the surroundings.
  • BThe molecules slow down and emit energy to the surroundings.
  • CThe molecules stay at the same speed and absorb energy from the surroundings.
  • DThe molecules stay at the same speed and emit energy to the surroundings.

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