Class Notes

1.1 The Study of Chemistry

Chemists are interested in the reactions and properties of matter and measure the changes from one state of matter to another. By analyzing the properties of matter, a chemist can design, modify, and improve the way a material function. We need a way to classify matter and must introduce terms that will allow you to communicate with a chemist.

1.3 Properties of Matter

In order for the properties of matter to take on meaning, a chemist must be able to quantify their measurements and communicate their results to other scientists. In 1960 a system was developed for the preferred metric units for use in science called SI Units. We will use these units throughout the course.

1.4 Units of Measurement

Now that we have emphasized the units we will be using, we need to come up with a system that will indicate to us, and more importantly, someone else who is reading our data, just how good our measurement is. Significant Figures tell us how good our data is.

1.5 Significant Figures

Once the rules for significant figures have been established for individual numbers, we then need to determine a set of rules allowing us to determine significant figures in calculations. The following video shows the significant figure rules for problems involving addition/subtraction and multiplication/division.

1.5 Significant Figures in Calculations

There are many instances in which a unit that we are given is not a unit that we want to use. Chemists use Dimensional Analysis to convert a given unit to another unit by using Conversion Factors.

1.6 Dimensional Analysis