A engineer wants to determine an efficient method for condensing large amounts of steam into liquid water. Which constant should you use?

Silica, sio2, is formed on silicon as an electrically insulating layer for microelectronic devices. silica is formed when silicon is exposed to o2 gas at an elevated temperature. at 900˚c, it takes 90 minutes for the oxygen to diffuse from the surface to form a 0.06 micron (0.06 x 10-6 m) thick layer of sio2 on

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

Chemistry worksheet - i am not sure what they are asking for exactly?