Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical equation: (
)O2 → (
)O3

3

2

Explanation:

3O2 => 2O3

the equation is balancing

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.