What is the concentration of H+ ions at a pH = 11? mol/L
What is the concentration of OH-ions at a pH = 11?
mol/L
What is the ratio of H+ ions to OH-ions at a pH = 11?
:1, OR 1:

Which is special about a dc circuit ? a. it has both series and parallel components b. it has only series or only parallel components c. charge moves in a single direction d. charge moves back and forth quickly

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?

The mantle is made up of which structural zones?