Write a chemical equation for the dissociation of nitric acid HNO3

I can't do that but this is the best I can do for you :(

Explanation:

Nitric acid, HNO3(aq), breaks up into ions (a cation and an anion) in a water solution.

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.