When communicating with Apollo astronauts, scientists on Earth use radio waves and the "over to you" method of communication. This method must be used because of the delay in communication. This delay is due to the

answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

hope it

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.