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 10
A beaker contains 100 mL of water at 25°C. If the temperature is increased to 50°C, what happens to the rate of evaporation?
A puddle of water dries up faster on a windy day than on a calm day. Explain why.
A student observes that petrol evaporates faster than water. Give a reason for this observation.
Describe two differences between evaporation and boiling.
A beaker contains 100 mL of water at 25°C. If the temperature is increased to 50°C, what happens to the rate of evaporation?
A puddle of water dries up faster on a windy day than on a calm day. Explain why.
A student observes that petrol evaporates faster than water. Give a reason for this observation.
Calculate the boiling point of water at an atmospheric pressure of 80 kPa, given that the normal boiling point at 101.3 kPa is 100°C. (Assume the boiling point decreases by about 1°C for every 2.7 kPa drop in pressure.)
Which of the following best describes evaporation? (1) A process where a liquid changes to a gas at any temperature below its boiling point (2) A process where a solid changes directly to a gas (3) A process where a liquid changes to a gas only at its boiling point (4) A process where a gas changes to a liquid
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 NOT a characteristic of boiling? (1) Occurs at a fixed temperature (2) Occurs only at the surface (3) Bubbles form throughout the liquid (4) Requires heat energy
Which of the following liquids will evaporate the fastest under identical conditions? (1) Water (2) Alcohol (3) Mercury (4) Oil
Boiling point of water at sea level is _______ °C.
Evaporation is a _______ process, while boiling is a _______ process.
Fill in the blank: The boiling point of a liquid depends on the _______ pressure.
Fill in the blank: The process by which a liquid changes to a gas at temperatures below its boiling point is called _______.
True or False: All liquids have the same boiling point.
True or False: Boiling occurs only at the surface of a liquid.
True or False: Evaporation can occur at all temperatures.
True or False: Evaporation is a cooling process.
