Which equation represents a reduction half-reaction? A)
Fe Fe3+ + 3e–

B)
Fe + 3e– Fe3+

C)
Fe3+ Fe + 3e–

D)
Fe3+ + 3e– Fe

Fe3+ + 3e– > Fe

Explanation:

Reduction refers to a gain of electrons. A specie is said to be reduced when it gains electrons or when it experiences a decrease in oxidation number. The both sentences above can be clearly seen when inspecting a reduction half equation.

Consider the redox reaction half equation;

Fe3+ + 3e– >Fe

We can see that Fe^3+ accepted three electrons, the oxidation number of iron thereby decreased from +3 to zero from left to right. This implies that the Fe^3+ was actually reduced according to the equation shown.

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation: