Which is a characteristic of weak acids and weak bases? Ka and Kb values of weak acids and weak bases are small.
Forward reactions of weak acids and weak bases are favored.
Dissociation of weak acids and weak bases is nearly complete.
Many H+ or OH– ions are present in their solution.

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence