Astudent 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?

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Answerthe energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.explanationwe define electric potential as the ratio electric potential energy to the charge,    then the following gives us the potential difference,      the formula  may be on your formula sheet.the change in electric potential energy would be the energy that would needed to move it from point a to point b. solving for that, we get    using q = 8.00  × 10⁻¹⁹ c and  δv = 2.00 v, we get    the energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.