Which of the following elements are in this unbalanced chemical reaction: Li
(s) + H20 (1) ► LiOH (aq) + H2 (g)?
Check all that apply
✓
A. H
B. H20
C. Li
D. O

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.

0.88m hope i am correct : )