Why do non metal ions change from being soluble in solution to insoluble at the surface of the cathode

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

Using data from seismic waves, geologists have learned that earth’s interior is made up of several

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.