This preview shows page 1. Sign up to view the full content.
Unformatted text preview: p track of things in more complicated problems. More examples will appear in subsequent labs.
The conversion factor approach, which is also called the factor labe l me thod, factor analysis, or dimensional
analysis, is a very useful place to start if you aren't sure how to do a problem. Figure out what units the problem
is asking for (moles of water in the example above) and set up the problem with the terms you are given, such
that unwanted units cancel out. Add conversion factors, e.g. from seconds to minutes, if needed. A very
useful conversion factor relates mass and volume. It is de ns ity, mass per unit volume. In chemistry, it is usually
expressed in g/mL (or its equivalent, g/cm3). Pure water at 25°C has a density of 1.00 g/mL. One gram of water
occupies exactly one milliliter. This is a useful relationship; memorize it.
In this lab, you will do several
experiments that will help you visualize how big a mole is, how small an atom is, and how to count by moles. You
will use the conversion factor approach frequently in the calculatio...
View Full Document
This document was uploaded on 01/22/2014.
- Spring '14