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How can you separate a mixture of cornstarch and water?

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It is easy to separate cornstarch from water. They are in a "mixture" together. That means that there has been no chemical reaction. The cornstarch is still cornstarch; the water is still water. Therefore you can "physically" separate them using techniques like evaporation, filtration, distillation, etc. In this case, simple evaporation would work. Of course, you will not end up with a nice powder; rather you will end up with a very hard 'clump' of cornstarch. By the way: If you used tap water (which contains dissolved minerals), the minerals will also stay behind when the water evaporates. That will add to the clumping of the original corn starch and would mean that you no longer have pure cornstarch.
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----further fun----
Fun with cornstarch:
Cornstarch and water is, indeed, a mixture ... but a very special one called a suspension (where the particles are suspended in the water and would settle out if given enough time). The cornstarch is not actually wet, even in water.!

This particular suspension has another special property, as it is a "Non-Newtonian" liquid. That means it acts like a liquid if you don't disturb it, but as soon as you do, it acts like a solid.

Example of what happens: If you stir the 'liquid' *slowly* with your finger, it acts just like a liquid. Try it again by stirring real fast and it will be like trying to stir a very thick kind of solid mass!

Search the Web for something like "cornstarch experiment" and you'll get lots of sites that will tell you how to do the experiment. And all it takes is cornstarch and water mixed to make a paste about like pancake batter!
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How will you separate the cornstarch from water?

cornstarch does not completely dissolve in the water as it appears to do, so if you pour the mixture through a fine filter you should be left with the cornstarch trapped insid

What kind of mixture is cornstarch and water together?

Anyone who has ever watched a classic western movie knows about the dangers of quicksand. You know... that gooey stuff that grabs a hold of its victim and swallows them alive!

Why does water and cornstarch mixture solidifies for a matter of secons?

The starch particles (solutes) remain suspended in water (solvent). If disturbed in a gentle manner, the solution remains viscous as the particles are given time to move about

What do you call a mixture of cornstarch and water?

I call it "thickening". You pour the mixture into a hot pan containing, say, a stir-fry, stir like crazy, and the mixture thickens into a nice gravy-like consistency.