In one of the experiments we will use a spectrophotometer to determine the absorbance of . In that same experiment the control will be a cuvette filled with .

The beam

A blank solution/solvent

Explanation:

Spectrophotometry is used to measure the amount of light that passes through a sample material and, by comparison to the initial intensity of light reaching the sample, they indirectly measure the amount of light absorbed by that sample

A blank is a sample that contains everything except for the analyte of interest. It is a sample of solvent. It is used for the calibration of the machine etc.

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.