Consider separate 1.0-l gaseous samples of h2, xe, cl2, and o2 all at stp. a. rank the gases in order of increasing average kinetic energy. b. rank the gases in order of increasing average velocity. c. how can separate 1.0-l samples of o2 and h2 each have the same average velocity.

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.