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Chemistry - Chap 7
Section 2 - Oxidation Numbers
Question | Answer |
---|---|
In order to indicate the general distribution of electrons among the bonded atoms in a molecular compound or a polyatomic ion what are assigned | Oxidation numbers also called oxidation states are assigned to atoms composing the compound or ion |
The number of electrons that must be added to or removed from an atom in a combined state to convert the atom into the elemental form | Oxidation number |
the condition of an atom expressed by teh number of electrons taht the atom needs to reach its elemental form | Oxidation state |
What is the difference between ionic charges and oxidation numbers | Oxidation numbers do not have an exact physical meaning. |
How are oxidation numbers useful | They are useful in naming compounds,in writing formulas, and in balancing chemical equations. |
The atoms in a pure element have an oxidation number of what | Zero |
The more-electronegative element in a binary molecular compound is assigned what | The number equal to the negative charge it would have as an anion. |
The less-electronegative atom is assigned what | The number equal to the positive charge it would have as a cation |
Fluorine has an oxidation number of | -1 in all of its compounds because it is the most electronegative element. |
Oxygen has an oxidation number of | -2 in almost all compounds. |
Hydrogen has an oxidation number of | +1 in all compounds containing elements that are more electronegative tahn it. |
Hydrogen has an oxidation number of what in compunds with metals. | -1 |
The algebraic sum of the oxidation number of all atoms in a neutral compound is equal to | zero |
The algebraic sum of the oxidation numbers of all atoms in a polyatomic ion is equal to | the charge of the ion |
A monatomic ion has an oxidation number equal to | The charge of the ion |
Oxidation numbers alone cannot be used to prove what | The existence of a compound |
What can be used as an alternative to teh prefeix system for naming binary molecular compounds | Stock System |
What is the oxidation number for : HCI | +1, -1 |
What is the oxidation number for : CF4 | +4, -1 |
What is the oxidation number for : PC3 | +3, -1 |
What is the oxidation number for : SO2 | +4, -2 |