To determine the type of material collected at a crime scene, the investigators have collected data from its combustion in a calorimeter. A 20.5 g piece of the material was heated to 94.4°C and
placed in 50.0 mL of water at 22.8°C. After thermal equilibrium, the final temperature of the
calorimetric system was 30.9°C. What was this unknown material?

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.

it would be d. henry moseley

hope this !

and sorry if i'm late. have a good rest of your day! : d