A occurs when what the scientist expects changes how the results of an experiment are viewed?
A. conundrum
B. bias
C. impass

clouds form

solid ice forms on leaves.

water droplets form on grass.

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.