2. lf we start with a pure substance (2-bromo-2-methylpropane bp 72 C) what will happen to the boiling point if we repeat several trials with the same sample? Will it go up, down or stay the same? Why? 3. lf we started with a mixed substance (1:1 2-bromo-2-methylpropane bp 72 C and 1- bromo-2-methylpropane, bp 91 C) what would happen to the boiling point if we repeat several trials with the same sample? Will it go up, down or stay the same? Why?