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.

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

question answered by

(jacemorris04)

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.