Depending upon the tip of the of a dropper pipet, there are approximately 20 drops per milliliter of water. the experimental procedure, parts a and b indicates the addition of 5-10 drops of each solution to the test tube. calculate the volume range in milliliters for a solution.

Answer : Volume range in milliliters for a solution is 0.25 ml to 0.5 ml.

Solution : Given,   1 ml = 20 drops

There are 20 drops present in     =    1 ml of water

                 In 1 drop                       =    

        And in 5 drops                     =    

                                                      =     0.25 ml

For range calculation, 0.25 ml is multiplied by the 2, we get

    = 0.25 × 2

    = 0.5 ml

Hence, the volume range is 0.25 ml to 0.5 ml.

"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."

can you attach the