A student spots an unknown sample on a TLC plate. After developing in hexanes/ethyl acetate 50:50, he/she saw a single spot with an Rf of 0.55. Does this indicate that the unknown material is a pure compound? What can be done to verify the purity of the sample?

The given unknown material or compound is a pure compound - yes, it has only one spot.

In the given TLC plate there is only one single spot found thus we can say it is the pure compound as If an impurity is present along with the major compound then there we could observe more spots other than the major compound.

The verification of the purity of the sample can be tested by a general procedure

Thus, The given unknown material or compound is a pure compound - yes, it has only one spot.

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Explanation:

A pure sample is known to give one spot on a chromatogram. This is the first indication that the substance is a pure substance. Since the student saw a single spot, the unknown substance is pure.

Subsequently, the substance can be boiled since it is a liquid. Impure substances boil over a range of temperatures. If the substance is pure, it will have a sharp boiling point which can be compared with boiling points of known substances recorded in literature hence the substance can be correctly identified.

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explanation:

no diagram was provided, but i'm guessing it's the one i've attached to my answer.

here, a mechanical force turns the rod.   this generates an electric current in the coil, which powers the bulb.