Can someone help me on questions 2-9

isint it soo big

Explanation:

i means this much question

passing a magnet thought the

mixture , because iron gets attracted to magnet .

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.