What is the oxidation number of Nitrogen in HNO₃

• -7

• -5

• +5

• +7

• +2

Determine the oxidation number of the selected element in each ion/ compound.

a) N in N₂O₄

b) Cr in CrO₄ ^2-

c) I in IO₃^-

• +8, -6, +5

• +2, +8, +6

• +4, +6, +5

• -4, -6, -5

• -4, -8, -6

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Identify the species reduced in the following reaction.

• Fe

• Ag

• none of these

• None of the above

Tags

NGSS.HS-PS1-2

Another name for a "oxidation-reduction" reaction is

• chemical reaction

• neutralization reaction

• redox reaction

• nuclear reaction

Tags

NGSS.HS-PS1-2

Oxidation is the _________ of electrons.

A decrease in oxidation number.

• Oxidation

• Combination

• Reduction

• Neutralization

Gaining oxygen is an example of...

(NCEA Level 2)

• Oxidation

• Reduction

• Neutralisation

• Combinations

If an atom loses electrons during a chemical reaction, the atom was:

• Oxidized

• Reduced

• Neutralized

• Precipitated

Tags

NGSS.HS-PS1-1

In a redox reaction, the species reduced

• gains electrons and is the oxidizing agent

• loses electrons and is the oxidizing agent

• gains electrons and is the reducing agent

• loses electrons and is the reducing agent

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Substance that oxidizes another substance by accepting its electrons.

• Oxidising agent

• Reducing agent

• Reductant

• Oxidant

Tags

NGSS.HS-PS1-2