Flashcards on Evaporation and Boiling: Separation Techniques
Evaporation and Boiling: Separation Techniques Explained
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Evaporation and Boiling of Liquids
15 cards
Card 1
Question: What happens to the solids dissolved in a liquid when the liquid evaporates?
Answer: The liquid turns into a gas and escapes into the air, leaving the dissolved solids behind.
Card 2
Question: Can evaporation happen at low temperatures?
Answer: Yes. Evaporation can happen at any temperature, even when it is cold, but it happens faster at higher temperatures.
Card 3
Question: How does temperature affect the rate of evaporation?
Answer: The rate of evaporation increases as temperature increases.
Card 4
Question: How can table salt be produced from rock salt underground?
Answer: Water is pumped into layers of rock salt to make brine, which is pumped up and heated so the water evaporates, leaving sodium chloride behind.
Card 5
Question: How can table salt be produced from sea water?
Answer: Sea water is left in shallow ponds; the water slowly evaporates over a week or more and the salt is left behind.
Card 6
Question: Why is salt left behind when sea water is left to evaporate in shallow ponds?
Answer: Because the water turns to gas and leaves the dissolved salt solids behind in the pond.
Card 7
Question: Would evaporation be faster in a cold cave or in warm salt ponds? Explain.
Answer: Evaporation would be greater in the warm salt ponds because higher temperatures increase the rate of evaporation.
Card 8
Question: What is the difference between evaporation and boiling?
Answer: Evaporation is liquid turning into gas at the surface; boiling is liquid turning to gas throughout the liquid, forming bubbles.
Card 9
Question: What visible sign shows a liquid is boiling?
Answer: You can see bubbles of gas forming and spreading through all parts of the liquid.
Card 10
Question: What is the boiling point of a liquid?
Answer: The boiling point is the temperature at which a liquid boils.