Which of these is NOT a cation? A) K+

B) Mg2+

C) NH4+

D) Cl-

What are fossils of organisms that existed over a wide area but only for a limited time period called?

Calculate the ph at the equivalence point for the titration of a solution containing 150.0 mg of ethylamine (c2h5nh2) with 0.1000 m hcl solution. the volume of the solution at the equivalence point is 250.0 ml. kb forethylamine is 4.7 × 10−4 .

The movement of tectonic plates and in two locations is described below: location a: tectonic played push together location b: tectonic plates push apart