Increasing the temperature increases the rate of a reaction by doing which of the following?
Potential energy of the products.
Lowering the frequency of effective collisions between reacting molecules.
Increasing the frequency of effective collisions between reacting molecules.
Increasing the activation energy.
Lowering the activation energy

1. they vary with a higher number because boiling is way hotter than melting

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.