Can someone answer 2 for me please?

the answer is B it remains constant

Explanation:

The total amount of energy and matter in the Universe remains constant, merely changing from one form to another.

fe 55.85 g/mol and h2o 18.02 g/mol.

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.