It’s more than just one answerSelect all the correct answers. Why do scientists use models?
O Models make some things easier to understand.
Measurements can be made only on models.
O Models help scientists visualize things they can't see.
Models are perfectly accurate representations of objects,
Scientists can analyze models to make predictions.

po-215 i got it right on the quiz

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.