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Listening Quiz: Lựa Chọn Dung Môi Phù Hợp Cho Quá Trình Kết Tinh Lại – Medium Level
Th1 29, 2025
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bởi
Anna Phạm
trong
Tiếng Anh Hóa Học (English for Chemistry)
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1.
What is the main topic of the conversation?
How to make a compound dissolve faster in water
How to choose a solvent for recrystallisation
How to safely store chemical solvents
How to mix two compounds for an experiment
Explanation:
William and Mia discuss the qualities of a good solvent for recrystallisation and how to test one.
2.
According to William, what should a good recrystallisation solvent do when the solution cools?
Turn the compound into a solid immediately when heated
Change the compound into a gas
Make the compound form crystals
Keep the compound fully dissolved
Explanation:
William says the compound should be less soluble when cold so it forms crystals as the solution cools.
3.
What does William say about a compound that dissolves well in both hot and cold solvent?
It will only crystallise if stirred hard enough
It should always be mixed with water
It will recrystallise very well
Recrystallisation will not work well
Explanation:
William states that if the compound is soluble in both hot and cold solvent, recrystallisation will not work well.
4.
How does William suggest Mia test the solubility of a solvent quickly?
By adding the compound directly to cold solvent
By dissolving a small amount of compound in hot solvent first
By shaking the compound with two solvents overnight
By heating the solvent until it evaporates
Explanation:
William recommends dissolving a small amount of the compound in hot solvent first and then cooling it.
5.
Why does William recommend trying a solvent mixture sometimes?
Because mixtures make the compound dissolve in cold solvent only
Because a mixture may work better than a single imperfect solvent
Because recrystallisation never works with one solvent
Because one solvent alone is always unsafe
Explanation:
William says that if one solvent is not perfect, sometimes a solvent mixture works better than one solvent alone.
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