Our sample starts at room temperature (300 K). We place our sample in the oven set to 500K. We then let our sample cool back to room temperature. What is our AT?

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; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;