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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 safely store chemical solvents
How to choose a solvent for recrystallisation
How to mix two compounds for an experiment
How to make a compound dissolve faster in water
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?
Change the compound into a gas
Keep the compound fully dissolved
Make the compound form crystals
Turn the compound into a solid immediately when heated
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 should always be mixed with water
Recrystallisation will not work well
It will recrystallise very well
It will only crystallise if stirred hard enough
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 dissolving a small amount of compound in hot solvent first
By heating the solvent until it evaporates
By shaking the compound with two solvents overnight
By adding the compound directly to cold solvent
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 a mixture may work better than a single imperfect solvent
Because recrystallisation never works with one solvent
Because one solvent alone is always unsafe
Because mixtures make the compound dissolve in cold solvent only
Explanation:
William says that if one solvent is not perfect, sometimes a solvent mixture works better than one solvent alone.
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