Module 4: Part C Binary Molecular Compounds
Binary Molecular compounds are explained after the ionic compounds in Corwin Chapter 7 section 7.7, and inorganic acids are not covered till last in the chapter.
The required Online Binary covalent Molecules Homework
The web site
†C: Binary Molecular Names:
Here is a brief tutorial for Part C:
PART C: BINARY COVALENT COMPOUNDS
Both elements are nonmetals attached by covalent bonds. These bonds may be single, double, or triple covalent. Due to the covalent bonding there are many ratios of the same two elements making many different compounds. For this reason, the chemist states how many atoms of each element is present in the chemical formula in the formal name of the compound.
Prefixes are attached to each element to indicate how many. Each student should learn the following prefixes:
MONO = ONE HEXA = SIX
DI = TWO HEPTA = SEVEN
TRI = THREE OCTA = EIGHT
TETRA = FOUR NONA = NINE
PENTA = FIVE DECA = TEN
The element that is shown first in the chemical formula is written first using the proper prefix to indicate how may atoms of that element is contained in the compound. If there is only one atom of that element it is often found without the prefix mono. If you leave the prefix off then it is understood that you mean mono.
The element which is written second in the chemical formula is written second in the chemical name, but in addition to the prefix indicating how many, the suffix of the elementís name is changed to -ide.
carbon becomes carbide chlorine becomes chloride
sulfur becomes sulfide oxygen becomes oxide
hydrogen becomes hydride nitrogen becomes nitride
Therefore, the following formulas of binary compounds would be spoken:
CCl4 carbon tetrachloride
SO2 sulfur dioxide
CO2 carbon dioxide
N2O3 dinitrogen trioxide
BH3 boron trihydride
We use common names for NH3, and H2O. What would be their correct binary molecular names? Methane, CH4, is the organic name for CH4, what would its inorganic name be?
For more practice on Corwin page 189 try problems 43 thru 46 for binary nonmetal compounds.