REDOX

The oxidation number of oxygen atoms in compounds is usually

• 0

• -1

• -2

• +1

The part of a reaction that involves only oxidation or reduction is a(n)

• redox reaction

• reduction reaction.

• oxidation-reduction equation

• half-reaction.

The sum of the oxidation numbers for all atoms in a polyatomic ion is equal to

• -2

• 0

• the charge on that ion

• the charge of the products

The sum of the oxidation numbers for all the atoms in a molecule is equal to

• -2

• 0

• the charge on that ion

• the charge of the products

The element sulfur can exist in all of the following oxidation states except

• -2

• +4

• +5

• +6

What is the oxidation half-reaction for the following redox reaction?

Zn + HgO → ZnO + Hg

• Zn → Zn²⁺ + 2e ^–

• Hg²⁺ + 2e ^– → Hg

• Zn + HgO

• ZnO + Hg

Tags

NGSS.HS-PS1-1

What is the reduction half-reaction for the following redox reaction?

Zn + HgO → ZnO + Hg

• Zn → Zn²⁺ 2e^–

• Hg²⁺ + 2e ^– → Hg

• Zn + HgO

• ZnO + Hg

When an element undergoes combustion and loses electrons, the element is

• oxidized.

• reduced.

• neutralized.

• dissolved.

Tags

NGSS.HS-PS1-2

Both positive and negative charges arise in redox reactions, but the only particles that move from one reactant to another are

• hydrogen atoms.

• protons.

• electrons.

• oxygen atoms

To balance a redox equation, you must balance the number of atoms and the

• moles of reactant

• moles of product

• protons.

• charge