Words with similar or inexact in sounds to create rhyme

What is the “narrow cell” in line 15 of “elegy written in a country churchyard”

You need to start an experiment and the instructions are to mix 2 g of sodium bicarbonate with 50 ml of distilled water and then mix the solution. describe what lab apparatus you would use and what safety precautions you must observe when completing this experiment.

Which sentence is the best translation of "you have displaced the mirth" broken the good meeting, / with most admired disorder"?