Organic Synthesis (OCR A-Level Chemistry A): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is the main advantage of filtration under reduced pressure over gravity filtration?
What is the main advantage of filtration under reduced pressure over gravity filtration?
It is significantly faster
Why must the filter paper be wetted before adding the sample in reduced pressure filtration?
Why must the filter paper be wetted before adding the sample in reduced pressure filtration?
Creates better seal, prevents solid passing
What property difference does recrystallisation exploit to purify solid products?
What property difference does recrystallisation exploit to purify solid products?
Differences in solubility
Why should minimum solvent volume be used during recrystallisation?
Why should minimum solvent volume be used during recrystallisation?
To maximize yield of pure product
Which solvent property is ideal for recrystallisation?
Which solvent property is ideal for recrystallisation?
Dissolves product readily when hot
What two effects do impurities have on the melting point of a solid?
What two effects do impurities have on the melting point of a solid?
Wider range and lower temperature
What melting range indicates a highly pure organic compound?
What melting range indicates a highly pure organic compound?
Why must heating be slow when approaching the melting point during determination?
Why must heating be slow when approaching the melting point during determination?
To obtain accurate measurements
Which piece of equipment is the thick-walled conical flask with a side arm?
Which piece of equipment is the thick-walled conical flask with a side arm?
Büchner flask
Why must the recrystallisation mixture be cooled before filtering?
Why must the recrystallisation mixture be cooled before filtering?
To maximize crystal formation and yield