for question 5 i just need to know process keeps the solution hot?

and then question 6&7

5. Why do we wish to keep the solution hot while performing a hot gravity filtration? What is the process that keeps the solution hot? 6. During a vacuum filtration using a water aspirator, even though all the solution has passed through the filter already, the vacuum is often left on for an extra 10 minutes or so, then the crystals are moved gently with a spatula while leaving the water on to test for suitability to remove from the funnel. What is the name of this process? 7. Would benzene dissolve better in water, or in ethanol? Why