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 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.
Calculate the amount of heat required to boil 100 g of water at 100°C. (Latent heat of vaporization of water = 2260 J/g)
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.
Explain why a liquid cools down as it evaporates.
Explain why alcohol evaporates faster than water at room temperature.
Explain why clothes dry faster when spread out than when bunched together.
Explain why sweating helps to cool the human body.
Explain why water boils at a lower temperature in a pressure cooker when the lid is not sealed.
If the atmospheric pressure increases, what happens to the boiling point of water?
State two differences between evaporation and boiling.
What is evaporation?
What is the effect of humidity on the rate of evaporation?
Why do we feel cold when alcohol is applied to the skin?
Why does water boil at a lower temperature on a mountain than at sea level?
