11-01: Oxidation & Reduction

Which particles are transferred during a redox reaction?

• atoms

• electrons

• neutrons

• positrons

Given the equation representing a reaction: 2Ca(s) + O₂(g) → 2CaO(s), during this reaction, each element changes in

• atomic number

• oxidation number

• number of protons per atom

• number of neutrons per atom

Given the equation representing a reaction:

3CuCl₂(aq) + 2Al(s) → 3Cu(s) + 2AlCl₃(aq)

the oxidation number of copper changes from

• +1 to 0

• +2 to 0

• +2 to +1

• +6 to +3

What are the two oxidation states of nitrogen in NH₄NO₂?

• +3 and +5

• +3 and -5

• -3 and +3

• -3 and -3

Which value changes when a Cu atom becomes a Cu²⁺ ion?

• mass number

• oxidation number

• number of protons

• number of neutrons

Given the balanced equation representing a reaction:

Ni(s) + 2HCl(aq) → NiCl₂(aq) + H₂(g)

in this reaction, each Ni atom

• loses 1 electron

• loses 2 electrons

• gains 1 electron

• gains 2 electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which process involves the transfer of electrons?

• double replacement

• neutralization

• oxidation-reduction

• sublimation

What occurs when Cr³⁺ ions are reduced to Cr²⁺ ions?

• Electrons are lost and the oxidation number of chromium increases.

• Electrons are lost and the oxidation number of chromium decreases.

• Electrons are gained and the oxidation number of chromium increases.

• Electrons are gained and the oxidation number of chromium decreases.

Tags

NGSS.HS-PS1-2

What occurs when a magnesium atom becomes a magnesium ion?

• Electrons are gained and the oxidation number increases.

• Electrons are gained and the oxidation number decreases.

• Electrons are lost and the oxidation number increases.

• Electrons are lost and the oxidation number decreases.

Tags

NGSS.HS-PS1-7

Which balanced equation represents a redox reaction?

• Mg + Cl₂ → MgCl₂

• CaO + H₂O → Ca(OH)₂

• HNO₃ + NaOH → NaNO₃ + H₂O

• NaCl + AgNO₃ → AgCl + NaNO₃

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2