When analyzed by tlc, a compound exhibited an rf value of 0.48 when diethyl ether was utilized as the developing solvent. in this analysis the solvent was allowed to travel a distance of 7.8 cm up the plate. if the solvent had been allowed to travel 11.3 cm up the plate how high up the plate would the compound have traveled?

5.4 cm

Explanation:

The Rf value can be calculated using the formula

Rf = A/B

Where A is the distance travelled by the compound, and B is the distance traveled by the solvent. If the compound and the developing solvent remain the same, the Rf value does not change, no matter the dimensions of the plate or how long the solvent was allowed to travel.

As such, we're left with Rf = 0.48 and B = 11.3 cm, so now we solve for A:

0.48 = A / 11.3

A = 5.4 cm

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."