What is the pH of a solution with [OH-] = 0.0034 ? (show your work)

When light strikes a plane mirror, images form in locations where light does not actually reach. it only appears to the observer as though the light were coming from this position. what type of image is formed?

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

The volume of helium in a blimp is 6.28 x 10^9 millimeters. the density of helium in the blimp is .1786 kilogram/meter^3. find the mass of the helium in the blimp.