CHEM 1003 Study Guide - Midterm Guide: Thermodynamics, Octet Rule, Soot
Document Summary
Composition of dry air: 78% nitrogen, diatomic, 21% oxygen, diatomic. The earth"s atmosphere: mesosphere, stratosphere, troposphere, the stratosphere & troposphere make up 99. 9& of the atmosphere"s mass, no sharp boundaries, average temperature of surface area is 20 degrees c. Immediate contact with earth"s surface: troposphere (0-15 km) 1: weather occurs, as altitude increases, temp of air decreased until 15 km, more molecules of air closer to the surface, much thicker, stratosphere (15-50 km) Viii: mesosphere chemical reactions, as altitude increases, temp of air increased because of, contains the ozone layer, as altitude increases, temperature decreases, little gravity, very thin, less dense. Law of conservation of mass: chemical reactions: atoms are rearranged in different compounds, reactants are transformed into products. A: hydrocarbons are used to produce energy, combustion always results in co 2 & h 2 0, cause global warming. Gasoline: a hydrocarbon, 2c 8 h 18 + 25o 2 16co 2 + 18h 2 0, complete combustion.
