7. What happens to the range of energies of the particles in matter when the temperature is increased?
The range of energies becomes broader.
The range of energies does not change.
The range of energies becomes narrower.
The range of energies cannot be determined.

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.

answer; 4 electrons;