question_answer 39)

  Fill in the blanks. (a) Evaporation of a liquid at room temperature leads to a........... effect. (b) At room temperature the forces of attraction between the particles of solid substances are?........ than those which exist in the gaseous state. (c) The arrangement of particles is less ordered in the?......... state. However, there is no order in the?......... state. (d) ??........ is the change of gaseous state directly to solid state without going through the?......... state. (e) The phenomenon of change of a liquid into the gaseous state at any temperature below its boiling point is called............... .

Answer:

  (a) Evaporation of a liquid at room temperature leads to a cooling effect. (b) At room temperature the forces of attraction between the particles of solid substances are stronger than those which exist in the gaseous state. (c) The arrangement of paritcles is less ordered in the liquid state. However, there is no order in the gaseous state. (d) Sublimation is the change of gaseous state directly to solid state without going through the liquid state. (e) The phenomenon of change of a liquid into the gaseous state at any temperature below its boiling point is called evaporation.