OA. The reaction between A and B is reactant favored.
OB. The amount of product is greater than the amount of reactant.
The reaction uses all its reactants to form products.
The reaction reaches equilibrium at 1.5 seconds.
O E. un amount of reactants is highest at equilibrium.

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.

thats how its supposed to be