You start a fire in a fireplace by striking a match and lighting crumpled paper under some logs. Explain all of the energy transitions in this scenario using the terms exothermic, endothermic, system, surroundings, potential energy, and kinetic energy in the discussion.

3 hours because it is a decent distance.

you didnt put any of the following

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.

it's c (engineer's do their work with mechanical stuff not on any living being)