The part of the experiment in which the experimental factor has been removed is referred to as the

The part of the experiment in which the experiment factor has been removed is refereed to as the INDEPENDENT VARIABLE.

In scientific investigations, variables refers to any factor or condition that exist in differing quantity. Typically, experiments always have two basic types of variables, these are dependent and independent variables. The independent variables are those variables whose values can be changed or controlled. Researchers always change the values of independent variables to determine their resultant effects on dependent variables.

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.