Chemistry

Many Chemistry students I know refer to Tyler Dewitt on YouTube so that could better grasp the Chemistry a little better.  Please refer to his channel if you should have additional questions.  I will only be posting some of the basics from my class.  This is not meant to give detailed information.  If I come across additional information, I will revise this post as needed.  If you think I need to add something, feel free to drop me a note, so that I can check it out.  Enjoy Chemistry.  Everything is made up of it.

Conversion Factors will be used extensively throughout basic Chemistry class.  It is written as equalities.  The basic method for conversion is below:

Original quantity X conversion factor = desired quantity

Example:  original quantity (20 lbs) X conversion factor =? Kilos

From the reference page we know that 1 lb = approx. 2.21 kilos.  Therefore, we will write work it as 20 lbs. X (1kg/2.21 lbs) = 9.0498 kg.  We put pounds at the bottom, so that it can be cancelled out.

 

Sometimes, you will you have come more than one unit.  For example: converting miles to meters or hours to seconds.   Convert each unit at a time.

Example:  Car traveling 45 mph to meters and hours to seconds

 

45miles/hour  X  1609 m (meters)/1 mi (miles) X  1 hr/3600 s (seconds) = 20.11 m/sec   

Word of warning:  Watch your abbreviations.  Notice how meters (m) and miles (mi) are very similar.

 

Significant Figures

 

Exact Numbers   Results from counting objects or part of a definition

Inexact Numbers contains a bit of uncertainty and is a unit of measurement or observation

 

 

Advertisements