CHEM 1100 Lecture Notes - Lecture 3: Sulfuric Acid, Phosphorus Pentoxide, Hexa
Document Summary
What"s in the air we breathe: the troposphere, 75% of air, by mass, lowest region in atmosphere, where we live, air: a mixture, 78% nitrogen, 21% oxygen, 1% other gases, mixture: physical combination of 2 or more substances. Bad gases: carbon monoxide, ozone, sulfur dioxide (so2, nitrogen dioxide (no2, particular matter (pm) Molecule: fixed # of atoms held together by chemical bonds, must be in a certain spatial arrangement. Chemical formula: shows the type and # of elements present. ***prefix tells the # of each type of element: n2o= dinitrogen monoxide (aka laughing gas, p2o5= diphosphorus pentoxide. Prefix mono- di- tri- tetra- penta- hexa- hepta- oxa- nona- deca: ccl4= carbon tetrachloride, note: Atoms listed from l to r as on periodic table: never start w mono , so2= sulfur dioxide, note: same column: listed from bottom to top. Chemical reactions: rearrangement of atoms, bonds are broken and/or formed.
