The name of the precipitate recovered by filtration

Answer;

-Residue

Explanation;

-Filtration is the process in which solid particles in a liquid or gaseous fluid are removed by the use of a filter medium that permits the fluid to pass through but retains the solid particles. It is a process that separates precipitates from solutions.

Filtrate  is the Liquid that Passes through the Filter Paper, while the residue is the Solid Remaining in the Filter Paper.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

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