3. Which substance will take more energy to heat from 20C to 100C?

a) 30 g of water
b) 300 g of water
and WHY?

300g of water because its a larger amount

Explanation:

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.