Whats the chemical
formula of the compound?

CBrClF₂  

Explanation:

You list the halogens in alphabetical order and  use a subscript 2 to show that there are two F atoms.

The formula is CBrClF₂.

The name of the compound is .

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.