Caffeine is a weak base with a Kb of 4.1×10−4 .Calculate the initial molar concentration of a solution of caffeine if the pH is 11.48. concentration:.

This chart represents the melting point of several substance. what besy explains the high melting point of the salt?

Which best explains why an iceberg floats?

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.