The base dissociation constant, Kb, of CH3NH2 is 4.4x 10-4. What does the Ky value indicate about this compound?​

Ineed to find the answer of this question because i dont understand it

What are the major types of a chemical compound

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?