9400 g = kg im in middle school by the way

9.4 kg

Explanation:

1000g =1 kg

9400g= 9400÷1000

=9.4kg

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.