Balance the equation c2h602=h2OVO2

N a H C O 3 = N a 2 C O 3 + H 2 O + C O 2

L i + H 2 O → L i O H + H 2

C H 4 + O 2 → H 2 O + C O 2

Explanation:

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.