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 12
A liquid is heated in a closed container. What will happen to the boiling point compared to an open container?
A sample of water boils at 95°C in a laboratory at high altitude. What does this indicate about the atmospheric pressure in the laboratory compared to sea level?
Describe the effect of atmospheric pressure on the boiling point of a liquid.
Describe the role of vapor pressure in the boiling of a liquid.
A 50 g sample of ethanol (boiling point 78.4°C, latent heat of vaporization 841 J/g) is to be vaporized at its boiling point. Calculate the energy required.
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 liquid is heated in a closed container. What will happen to the boiling point compared to an open container?
A sample of water boils at 95°C in a laboratory at high altitude. What does this indicate about the atmospheric pressure in the laboratory compared to sea level?
Which of the following best describes the energy change during boiling? (1) The liquid absorbs heat without a change in temperature. (2) The liquid releases heat and its temperature increases. (3) The liquid absorbs heat and its temperature increases. (4) The liquid releases heat without a change in temperature.
Which of the following best explains why clothes dry faster on a windy day? (1) Wind increases the temperature. (2) Wind decreases the humidity near the surface of the clothes. (3) Wind increases the boiling point of water. (4) Wind decreases the surface area of the clothes.
Which of the following best explains why pressure cookers cook food faster? (1) They increase the boiling point of water. (2) They decrease the boiling point of water. (3) They increase the rate of evaporation. (4) They decrease the rate of evaporation.
Which of the following factors does NOT affect the rate of evaporation? (1) Surface area (2) Temperature (3) Humidity (4) Color of the liquid
Fill in the blank: The ________ heat of vaporization is the amount of heat required to convert 1 gram of a liquid into vapor at its boiling point without changing temperature.
Increasing the surface area of a liquid will ________ the rate of evaporation.
The normal boiling point of a liquid is defined as the temperature at which its vapor pressure equals ________.
The process by which a liquid changes to vapor at its surface below its boiling point is called ________.
True or False: Boiling can occur at temperatures lower than the normal boiling point if the external pressure is reduced.
True or False: Boiling occurs only at a specific temperature for a given pressure, while evaporation can occur at any temperature.
True or False: During boiling, the temperature of the liquid continues to rise until all the liquid has vaporized.
True or False: During boiling, the temperature of the liquid remains constant until all the liquid has vaporized.
