I tried to make sense of the Four Books, until love arrived, and it all became a single syllable. Yunus
Idea Transcript
» Binary molecular compounds ˃ Composed of two nonmetal elements
» No ions are present, just molecules, therefore ionic charge cannot be used to write names or formulas » If we named molecular compounds as though they were ionic compounds there would be no way to differentiate between two or more compounds with the same elements in different ratios.
» We use prefixes in the name of binary molecular compounds to differentiate between compounds with different amounts of the same elements. » The prefixes tell us how much of each element are present in 1 molecules of the compound Table 9.4 Prefixes Used in Naming Binary Molecular Compounds Prefix
Mono-
Di-
Tri-
Tetra-
Penta-
Hexa-
Hepta-
Octa-
Nona-
Deca-
#
1
2
3
4
5
6
7
8
9
10
» Confirm that the compound is a binary molecular compound » The name must identify the elements in the molecule and the number of each atom » Use prefixes to indicate the number of atoms » If there is only 1 atom of the first element, do not use a prefix (OMIT MONO-) » The second element should always have a prefix. » The central atom is generally written first. » The suffix of the 2nd element will always be –ide.
» Examples ˃ ˃ ˃ ˃
CO2 carbon monoxide N2O dinitrogen monoxide Cl2O8