which of the following is not a property of water
1) water has a great capacity to hold a moderate heat energy
2) water is an excellent solvent because of its polar molecules
3) like most compounds solid water is denser than liquid water
4) hydrogen bonds allow water to move upward in a narrow column

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.

the dissolution of polymer can be thermodynamically described in 2 steps.