Central sleep apnea is a breathing disorder that occurs during sleep and results when the brain fails to activate the respiratory muscles. This leads to a brief pause in breathing that may last 10 seconds or longer. Unlike the more standard obstructive sleep apnea - which is caused when the upper airway becomes temporarily obstructed - in central sleep apnea, the effort to breathe stops and there is no clear obstruction of the airway. Though the cause is slightly different, the outcome of central sleep apnea is the same.
Naming Inorganic Compounds. Binary Molecular Compounds. When a pair of elements form more than one type of covalent compound, Greek prefixes are used to indicate how many of each element are in a compound. The more electronegative element is written last and its ending is changed to ide.Examples.hen a pair of elements form more than one type of covalent compound, Greek prefixes are used to indicate how many of each element are in a compound.
It's these weak intermolecular forces that determine many of the properties of covalent molecular compounds. Elemental Composition of Covalent Compounds. Compounds that contain both metals and nonmetals are usually ionic, not covalent. So KBr and Na. Properties of Covalent Molecular Compounds. 1  Low melting points and boiling points. 2  Low enthalpies of fusion and vaporization These properties are usually one or two orders of magnitude smaller than they are for ionic compounds. 3  Soft or brittle solid forms. 4  Poor electrical and thermal conductivity.