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Questions and Answers
What is the oxidation number of sulfur (S) in the sulfate ion (SO₄²⁻)?
What is the oxidation number of sulfur (S) in the sulfate ion (SO₄²⁻)?
- +2
- +4
- +6 (correct)
- -2
Which of the following compounds contains hydrogen with an oxidation number of -1?
Which of the following compounds contains hydrogen with an oxidation number of -1?
- NH₃
- HCl
- H₂O
- NaH (correct)
What is the oxidation number of oxygen in hydrogen peroxide (H₂O₂)?
What is the oxidation number of oxygen in hydrogen peroxide (H₂O₂)?
- 0
- -2
- +2
- -1 (correct)
Determine the oxidation number of chlorine (Cl) in the perchlorate ion (ClO₄⁻).
Determine the oxidation number of chlorine (Cl) in the perchlorate ion (ClO₄⁻).
In which of the following molecules does chlorine NOT have an oxidation number of -1?
In which of the following molecules does chlorine NOT have an oxidation number of -1?
What is the oxidation number of chromium (Cr) in the dichromate ion (Cr₂O₇²⁻)?
What is the oxidation number of chromium (Cr) in the dichromate ion (Cr₂O₇²⁻)?
What is the oxidation number of fluorine in oxygen difluoride (OF₂)?
What is the oxidation number of fluorine in oxygen difluoride (OF₂)?
If an unknown element X forms a compound with oxygen having the formula X₂O₃, and oxygen has an oxidation state of -2. What is the oxidation state of element X?
If an unknown element X forms a compound with oxygen having the formula X₂O₃, and oxygen has an oxidation state of -2. What is the oxidation state of element X?
What is the oxidation number of carbon in the cyanide ion (CN⁻)?
What is the oxidation number of carbon in the cyanide ion (CN⁻)?
In the interhalogen compound ICl₃, what is the oxidation number of iodine?
In the interhalogen compound ICl₃, what is the oxidation number of iodine?
Flashcards
Oxidation Number
Oxidation Number
The charge an atom would have if all bonds were ionic.
Oxidation number of a free element
Oxidation number of a free element
Zero
Fluorine's oxidation number in compounds
Fluorine's oxidation number in compounds
-1
Oxidation number of a monatomic ion
Oxidation number of a monatomic ion
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Oxidation number of alkali metals (Group IA)
Oxidation number of alkali metals (Group IA)
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Oxidation number of alkaline earth metals (Group IIA)
Oxidation number of alkaline earth metals (Group IIA)
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Common oxidation number of oxygen
Common oxidation number of oxygen
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Common oxidation number of hydrogen
Common oxidation number of hydrogen
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Sum of oxidation numbers
Sum of oxidation numbers
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Oxidation number for cyanide (CN-)
Oxidation number for cyanide (CN-)
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Study Notes
- Oxidation numbers track electrons in chemical reactions.
- They indicate the degree of oxidation or reduction of atoms in molecules.
Oxidation Number Rules
- Elements in their free state have an oxidation number of zero.
- Fluorine always has an oxidation number of –1 in compounds.
- Chlorine, bromine, and iodine usually have an oxidation number of –1, unless combined with oxygen or fluorine.
- The oxidation number of a monatomic ion equals its charge.
- Alkali metals (Group IA) have an oxidation number of +1 in compounds.
- Alkaline earth metals (Group IIA) have an oxidation number of +2 in compounds.
- Oxygen usually has an oxidation number of –2, except in peroxides (–1) or when bonded to fluorine (+2).
- Hydrogen generally has an oxidation number of +1, but in metal hydrides, it is –1.
- The sum of oxidation numbers in a neutral molecule is zero.
- In polyatomic ions, the sum of oxidation numbers equals the charge on the ion.
- In interhalogen compounds, the more electronegative halogen has an oxidation number of –1.
- Cyanide (CN-) always has an oxidation number of –1.
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