Practical Techniques in Organic Chemistry (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 key feature of Quickfit apparatus creates an airtight seal?
What key feature of Quickfit apparatus creates an airtight seal?
Ground-glass joints
Why must anti-bumping granules be added before heating under reflux?
Why must anti-bumping granules be added before heating under reflux?
Provide surfaces for smooth boiling
Which direction must water flow through a condenser during reflux?
Which direction must water flow through a condenser during reflux?
Enter at bottom, exit at top
Why must the top of a reflux condenser never be stoppered?
Why must the top of a reflux condenser never be stoppered?
Prevent pressure build-up & explosion
How is the condenser positioned differently in distillation compared to reflux?
How is the condenser positioned differently in distillation compared to reflux?
At an angle, not vertically
Which component distils first during distillation?
Which component distils first during distillation?
Liquid with lowest boiling point
How do you identify which layer is aqueous after separating an organic product?
How do you identify which layer is aqueous after separating an organic product?
Add water; aqueous layer increases
What indicates that an organic liquid is completely dry after adding drying agent?
What indicates that an organic liquid is completely dry after adding drying agent?
Some solid remains as fine powder
Why is aqueous sodium carbonate () used to wash organic products?
Why is aqueous sodium carbonate () used to wash organic products?
Remove acid impurities
When is redistillation used to purify an organic liquid?
When is redistillation used to purify an organic liquid?
When impurities have close boiling pts