What is the oxidation half-reaction for mg(s) + zncl2(aq) mgcl2(aq) + zn(s)?

a. zn(s) --> zn^2+ + 2e-
b. mg(s) --> mg2+ + 2e-
c. zn^2+ + 2e- --> zn(s)
d. mg^2+ + 2e- --> mg(s)

B)

Explanation: Oxidation is loss of electrons and reduction is gain of electrons. When an element or ion loses electrons then its positive charge increases and when it gains electrons then charge decreases.

In the given equation, on reactant side Mg has zero charge and Zn has +2 charge. On product side, Mg has +2 charge and Zn has zero charge.

Since the charge of Mg is increasing from zero to +2, its oxidation.

We can ignore choice A and C since none of these have Mg. Choice D could also be ignored as it shows reduction of Mg as its changing from +2 to 0 state.

Hence, the correct choice is B as it shows an oxidation of Mg.

B)

c (diamond),

sio2 (quartz)

answer: cellular respiration takes in food and uses it to create atp, a chemical which the cell uses for energy. usually, this process uses oxygen, and is called aerobic respiration. it has four stages known as glycolysis, link reaction, the krebs cycle, and the electron transport chain.