CHEM 2310 Lecture Notes - Scientific Notation, Safety Data Sheet, Fetus
Document Summary
Chemistry is the study of matters and its changes. Matter is anything that has mass and volume. History of matter thales to aristotle four types of matter, joined by 4 principles. Thomas jefferson and everyone for 2 thousand years subscribed to this idea. Clean air the composition of our air. Even though air might smell different, it will still only be less than one percent ambient air. To be considered air, we have to be able to breathe it. So a mixture is comprised of pure substances. 78 percent really just means 78 parts per hundred. 21 percent / pph is molecular oxygen. Required to make us who we are is the presence of nitrogen: typical composition of inhaled and exhaled air substance. Parts per hundred (percent: atmosphere is 21 % oxygen = 21 oxygen molecules per 100 molecules and atoms in air. 1 x 10^6 molecules and atomos in air.
