For each reaction, identify the substance being oxidized and the substance being reduced.
(a) 2 Sr(s) + O2(g) → 2 SrO(s)
(b) Ca(s) + Cl2(g) → CaCl2(s)
(c) Ni2+(aq) + Mg(s) → Mg2+ (aq) + Ni(s)
Solution: Here, we are going to identify the substance that is oxidized and reduced in the given reactions.
The term “oxidation” is defined as the addition of oxygen/electronegative element to a substance or removal of hydrogen/ electropositive element from a substance. The substance which undergoes oxidation are said to be oxidized.
Whereas the term “reduction” is defined as removal of oxygen/electronegative element from a substance or addition of hydrogen/ electropositive element to a substance.
In terms of electron transfer, the reactions that involve loss of electrons are called oxidation reactions. Similarly, the reactions that involve gain of electrons...