Which of the following regarding ionic bonds is TRUE? A. ionic bonds are strong yet water can break them, separating the ions.
B. an ionic bond is formed between an anion and a cation.
C. ionic bonds form between atoms with full positive and full negative charges.
D. when an atom accepts an electron, it becomes an anion.
E. an atom with 1 electron in its valance shell is likely to become a cation.

the dependant variable is spilled water

the independent is the heat

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.