Oxidation Numbers

What is the oxidation number of carbon in CO₂

+4

What is the oxidation number of hydrogen in HBrO?

+1

What is oxygen's oxidation number in HBrO?

-2

What is the oxidation number of Br in HBrO?

+1

What is the oxidation number of oxygen in CO₂?

-2

What is the oxidation number of oxygen in C₂O₄²⁻ ?

-2

What is the oxidation number of C in C₂O₄²⁻ ?

+3

What is the oxidation number of chlorine in SnCl₃⁻?

-1

What is tin's oxidation number in SnCl₃⁻ ?

+2

What is hydrogen's oxidation number in C₆H₁₂O₆?

+1

What is oxygen's oxidation number in C₆H₁₂O₆?

-2

What is carbon's oxidation number in C₆H₁₂O₆?

0

What is the oxidation state of aluminum in Al(NO₃)₃?

+3

What is the oxidation number of an oxygen atom in Al(NO₃)₃?

-2

What is the oxidation number of Nitrogen in NO₃⁻¹?

+5

Define: Oxidation

An increase in oxidation number or the loss of electrons.

Define: Reduction

A decrease in oxidation number or the gain of electrons.

The oxidation number of an atom in the elemental state is...

Zero

What is the oxidation number of Cl in Cl₂(g) and Al in Al(s)?

Zero

The oxidation number of a monatomic ion is equal to...

Its charge

What is the oxidation number of the two elements in NaCl:

Na has an oxidation number of +1 and Cl has an oxidation number of -1.

The sum of the oxidation numbers in the formula of a compound is...

Zero

What is the sum of the oxidation numbers in NaCl?

0

The oxidation number of hydrogen in a compound is ___, except when hydrogen forms compounds with active metals, in which case it is ___.

+1, -1.

Oxidation state of H in H₂O is _____, but is _____ in NaH

+1, -1.

The oxidation number of oxygen in a compound is ___, except in peroxides when it is ___, and when combined with fluorine, in which case it is ___.

-2, -1, +2.

In H₂O, the oxygen has an oxidation state of ______, in H₂O₂, it is _____.

-2, -1

The sum of the oxidation numbers in the formula for a polyatomic ion is equal to ___ ______ __ ____ ___.

The charge of that ion.

In the sulfate ion, (SO₄)⁻², what is do the oxidation numbers of the sulfur and the oxygens add up to?

-2

In a sulfate ion, (SO₄)⁻², The oxygens have an oxidation state of ____ , and the sulfur is _____.

-2, +6