Achemical is placed in a beaker containing 20 g of soil and 500 ml of water. at equilibrium, the chemical is found in the soil ast a concentration of 100 mg . kg-1 of soil. the equilibrium concentration of this same chemical in the water is 250 what is the partition coefficient for this chemical on this soil?400 mg kg-1/mg l-1

Kd = 400 (mg/kg)/(mg/L)

Explanation:

Assume that the units for the concentration of the chemical in water is μg/L

Convert units of concentration of chemical in water to mg/L

Cw = 250 μg/L

Here, the concentration of chemical in water is Cw

1 mg = 11000 μg

Cw = 250 x 10⁻³mg/L

Calculate the partition coefficient for the chemical in soil as follows

Kd = Cs/Cw

Here, the partition coefficient is Kd, the concentration on the soil at equilibrium is Cs and the concentration of chemical in water at equilibrium is Cw.

Substitute 250 x 10⁻³ mg/L for Cw and 1000 mg/kg for Cs

Kd = 100 (mg/kg))/ (250 x 10⁻³)(mg/L)

Kd = 400 (mg/kg)/(mg/L)

these nuts

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.