Unit 4 oxidation states

Front

What is the oxidation number of carbon in carbon dioxide (CO₂)?

Back

+4

Front

What is the oxidation number for oxygen in dilithium dioxide (Li₂O₂)?

Back

-1

Front

What is the oxidation number of hydrogen in boron trihydride (BH₃)?

Back

-1

Front

What is the oxidation number of oxygen in phosphorus tetroxide ion ([PO₄]³⁻)?

Back

-2

Front

What is the oxidation number for sulfur in octasulfur (S₈)?

Back

0

Front

Define oxidation state.

Back

The oxidation state (or oxidation number) is a measure of the degree of oxidation of an atom in a substance, indicating the number of electrons lost or gained.

Front

What is the oxidation number of oxygen in most compounds?

Back

Typically -2.

Front

What is the oxidation number of hydrogen in most compounds?

Back

Typically +1.

Front

What is the oxidation number of an element in its standard state?

Back

0.

Front

How do you determine the oxidation number of an element in a compound?

Back

By using known oxidation states of other elements in the compound and ensuring the total charge is balanced.