A chemist titrates 130.0 mL of a 0.2136 M trimethylamine ((CH3N solution with 0.8361 M HNO3 solution at 25 °C. Calculate the pH at equivalence. The pKb of trimethylamine is 4.19.
Note for advanced students: you may assume the total volume of the solution equals the initial volume plus the volume of HNO3 solution added.

Which metal exist in liquid state and can be cut with knife ?

Which one of the following bonds would you expect to be the most polar? a) b–h b) n–h c) p–h d) al–h e) c–h

Asubstance is held in an open container. its particles move past one another at random speeds but do not leave the container. heat is removed from the system, and the particles slow down. when enough heat is removed, the particles no longer have enough speed to overcome the weak attractive forces between them. when this happens, the substance enters its solid state. the process described above is known as .