Intro to redox reactions

Which statement best describes a redox reaction?

• A single chemical reaction that involves the transfer of electrons.

• Two chemical reactions occurring simultaneously involving the transfer of electrons.

• An oxidation and reduction reaction.

• Rusting

Which is not a redox reaction?

• Apple turning brown

• Corrosion (rusting)

• Cellular respiration

• Baking a cake

What is oxidation?

• When a chemical species gain hydrogen.

• When a chemical species lose electrons.

• When a chemical species gain electrons.

• When a chemical species lose hydrogen.

What is reduction?

• When a chemical species gain hydrogen.

• When a chemical species lose electrons.

• When a chemical species gain electrons.

• When a chemical species lose hydrogen.

A reducing agent causes the other chemical species to undergo reduction, so it will lose electrons because it is oxidised itself.

• True

• False

What is the name of this equation: Fe²⁺ _(aq) + 2e^- --> Fe_(s)

• A full redox equation

• A net chemical equation

• A half redox equation

• An overall chemical equation

Zn_(s) --> Zn²⁺ _(aq) + 2e^- shows what type of redox reaction?

• Oxidation

• Reduction

What is occurring in this reaction 2Mg_(s) + O_2(g) --> 2MgO_(s)?

• Oxygen atom displaces the magnesium atoms

• A solid magnesium ribbon is undergoing reduction while oxygen is undergoing oxidation.

• A solid magnesium ribbon is undergoing oxidation while oxygen is undergoing reduction.

• A transfer of electrons from oxygen to magnesium.

In the reaction 2Mg_(s) + O_2(g) --> 2MgO_(s), which is the reductant?

• Mg_(s)

• O_2(g)

• MgO_(s)

In the reaction 2Mg_(s) + O_2(g) --> 2MgO_(s), which is the oxidant?

• Mg_(s)

• O2_(g)

• MgO_(s)