Redox test

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

Which value changes when a Cu atom becomes a Cu 2+ ion?

• mass number

• oxidation number

• number of protons

• number of neutrons

What is the oxidation number of manganese in KMnO4?

• +7

• +2

• +3

• +4

Which half-reaction equation represents reduction?

• Cu^2+ + 2e^- → Cu

• Cu^2+ + 2e^- → Cu^+

• Ag + e^- → Ag^+

• Ag^+ → Ag + e^-

Which metal is most easily oxidized?

• Ag

• Co

• Cu

• Mg

Which equation represents a reduction half-reaction?

• Fe → Fe^3+ + 3e^-

• Fe + 3e^- → Fe^3+

• Fe^3+ → Fe + 3e^-

• Fe^3+ + 3e^- → Fe

Which process involves the transfer of electrons?

• double replacement

• neutralization

• oxidation-reduction

• sublimation

During an oxidation-reduction reaction, the number of electrons gained is

• equal to the number of electrons lost

• equal to the number of protons gained

• less than the number of electrons lost

• less than the number of protons gained

Given the balanced equation representing a reaction: 2Al(s) + 3Cu^2+(aq) → 2Al^3+(aq) + 3Cu(s). Which particles are transferred in this reaction?

• electrons

• neutrons

• positrons

• protons

Given the balanced ionic equation representing a reaction: Zn(s) + Co^2+(aq) → Zn^2+(aq) + Co(s). Which statement describes the electrons involved in this reaction?

• Each Zn atom loses 2 electrons, and each Co^2+ ion gains 2 electrons.

• Each Zn atom loses 2 electrons, and each Co^2+ ion loses 2 electrons.

• Each Zn atom gains 2 electrons, and each Co^2+ ion loses 2 electrons.

• Each Zn atom gains 2 electrons, and each Co^2+ ion gains 2 electrons.