You have a white crystalline solid, known to be one of the potassium compounds listed below. to determine which one, you measure its density. you measure out 15.57 g and transfer it to a graduated cylinder containing kerosene (in which these compounds will not dissolve). the level of liquid kerosene rises from 8.5 ml to 15.3 ml. calculate the density of the solid, and identify the compound from the following list.

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)