Which of the following best describes spectator ions? A. lons that combine to form a precipitate
B. lons that are made of a single element
C. lons that do not participate in the reaction
D. Ions made when compounds dissolve in water

C. lons that do not participate in the reaction

Explanation

:

A spectator ion is an ion that exists as a reactant and a product in a chemical equation but it does not take part in the chemical reaction.

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.