CHEM 1003 Lecture Notes - Lecture 3: Umber, Internal Combustion Engine, Lead
Document Summary
Troposphere (0-15km)- region in immediate contact with earth"s surface, in which all of our weather occur. The troposphere and stratosphere make up 99. 9% of the atmospheres mass. Molecules- combination of a fixed number of atoms held together in a certain geometric arrangement. Chemical formulas- symbolic representations of the elementary composition of. Chemical formulas- symbolic representations of the elementary composition of chemical compounds (ex. Chemical reactions- atoms are rearranged in different compounds: reactants are transformed into products. Law of conservation of mass- in a chemical reaction mass is conserved. Ch4 + o2 ---> co2 + h2o (non balanced equation) Ch4 + 2o2 ---> co2 + 2h20 (balanced equation) When you react a carbon molecule with a oxygen molecule to form co2 and water it is called complete combustion reaction. Identity of atoms in reactants = identity of atoms in product. Number of atoms in reactants = number of atoms in products. Mass of all reactants = mass of all products.
