A substance that gives up a proton during a chemical reaction, raising the hydrogen ion concentration of water, is most appropriately called.

b.final

1. they vary with a higher number because boiling is way hotter than melting

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.