Which of the following covalent bonds is the most polar?

h-f

h-c

h-n

h-h

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.

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

Connect the whole numbers on the periodic table to indicate what they represent?