Evaporation and Boiling
Chemistry ⇒ States of Matter
Evaporation and Boiling starts at 7 and continues till grade 12.
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See sample questions for grade 9
A puddle of water dries up faster on a hot, dry day than on a cool, humid day. Explain why.
Describe two ways to increase the rate of evaporation of a liquid.
Describe what happens to the kinetic energy of molecules during evaporation.
Describe what happens to the temperature of a liquid during boiling.
A 50 g sample of water at 100°C is converted to steam. How much heat is required? (Latent heat of vaporization = 2260 J/g)
A beaker contains 200 g of water at 100°C. How much energy is needed to convert all the water to steam? (Latent heat of vaporization = 2260 J/g)
A puddle of water dries up faster on a hot, dry day than on a cool, humid day. Explain why.
Explain why clothes dry faster when spread out than when bunched together.
Which of the following best explains why boiling water does not get hotter even if you keep heating it? (1) The heat is used to increase the temperature. (2) The heat is used to break intermolecular bonds. (3) The heat is lost to the surroundings. (4) The heat is used to increase pressure.
Which of the following factors does NOT affect the rate of evaporation? (1) Surface area (2) Temperature (3) Humidity (4) Color of the liquid
Which of the following is a surface phenomenon? (1) Boiling (2) Evaporation (3) Both (4) Neither
Which of the following is NOT a characteristic of boiling? (1) Occurs at a fixed temperature (2) Occurs only at the surface (3) Bubbles form throughout the liquid (4) Temperature remains constant during the process
Fill in the blank: The boiling point of water at sea level is ________ °C.
Fill in the blank: The energy required to change 1 gram of a liquid into vapor at its boiling point is called ________.
Fill in the blank: The process of a liquid changing into vapor at temperatures below its boiling point is called ________.
Fill in the blank: The process of changing from a liquid to a gas at the boiling point is called ________.
True or False: Boiling can occur at temperatures below the boiling point if the pressure is reduced.
True or False: Boiling is a surface phenomenon.
True or False: Evaporation can take place at any temperature.
True or False: Evaporation causes cooling of the liquid left behind.
