Melting, boiling and evaporation：练习题

• a.Both the internal potential energy and internal kinetic energy increase.
• b.The internal potential energy remains constant while the internal kinetic energy increases.
• c.The internal potential energy increases while the internal kinetic energy decreases.
• d.The internal potential energy increases while the internal kinetic energy remains constant.

• a.The process of evaporation is endothermic and directly lowers the internal potential energy of the particles.
• b.The escaping gas molecules collide with the liquid surface and transfer cold energy to the liquid.
• c.The liquid absorbs thermal energy from its surroundings to break intermolecular bonds.
• d.Molecules with higher kinetic energy escape from the surface, reducing the average kinetic energy of the remaining molecules.

• a.Increasing the speed of air flow across the surface of the liquid.
• b.Increasing the surface area of the liquid.
• c.Increasing the humidity of the surrounding air.
• d.Increasing the temperature of the liquid.

• a.Evaporation occurs at any temperature below the boiling point, whereas boiling occurs only at a fixed temperature.
• b.Evaporation causes the temperature of the liquid to rise, whereas boiling keeps it constant.
• c.Boiling requires a cooling effect on the surroundings, whereas evaporation requires a heating effect.
• d.Boiling is a surface phenomenon, whereas evaporation occurs throughout the whole liquid.

• a.Region Q only
• b.Region S only
• c.Region R only
• d.Regions Q and S

先自己写一遍答案，再对照解题步骤。

先自己写一遍答案，再对照解题步骤。