Which reactions are redox reactions? (a) Ba(NO3)2(a q)+K2 SO4(a q) ⟶BaSO4(s)+2 KNO3(a q) (b) C

step 1 Let's indicate which reactions are redox reactions. For A, A is not a redox reaction. A is a pre

Which reactions are redox reactions? (a) Ba(NO3)2(a q)+K2...

Which reactions are redox reactions? (a) $\quad \mathrm{Ba}\left(\mathrm{NO}_{3}\right)_{2}(a q)+\mathrm{K}_{2} \mathrm{SO}_{4}(a q) \longrightarrow$ $\mathrm{BaSO}_{4}(s)+2 \mathrm{KNO}_{3}(a q)$ (b) $\mathrm{Ca}(s)+\mathrm{Cl}_{2}(g) \longrightarrow \mathrm{CaCl}_{2}(s)$ (c) $\mathrm{HCl}(a q)+\mathrm{NaOH}(a q) \longrightarrow \mathrm{H}_{2} \mathrm{O}(l)+\mathrm{NaCl}(a q)$ (d) $\mathrm{Zn}(s)+\mathrm{Fe}^{2+}(a q) \longrightarrow \mathrm{Zn}^{2+}(a q)+\mathrm{Fe}(s)$

Which reactions are redox reactions?
(a) $\quad \mathrm{Ba}\left(\mathrm{NO}_{3}\right)_{2}(a q)+\mathrm{K}_{2} \mathrm{SO}_{4}(a q) \longrightarrow$ $\mathrm{BaSO}_{4}(s)+2 \mathrm{KNO}_{3}(a q)$
(b) $\mathrm{Ca}(s)+\mathrm{Cl}_{2}(g) \longrightarrow \mathrm{CaCl}_{2}(s)$
(c) $\mathrm{HCl}(a q)+\mathrm{NaOH}(a q) \longrightarrow \mathrm{H}_{2} \mathrm{O}(l)+\mathrm{NaCl}(a q)$
(d) $\mathrm{Zn}(s)+\mathrm{Fe}^{2+}(a q) \longrightarrow \mathrm{Zn}^{2+}(a q)+\mathrm{Fe}(s)$

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Key Concepts

Oxidation-Reduction (Redox) Reactions

Redox reactions are chemical processes in which electrons are transferred from one species to another. This transfer results in changes in the oxidation states of the elements involved, with one substance undergoing oxidation (loss of electrons) and another undergoing reduction (gain of electrons).

Oxidation States

The concept of oxidation states involves assigning a hypothetical charge to atoms in a compound, assuming that electrons are completely transferred in bonds. Tracking changes in oxidation states during a reaction helps determine whether a redox process has occurred.

Single Displacement Reactions

Single displacement reactions involve one element replacing another in a compound. These reactions are often redox reactions because the incoming element typically donates electrons to the displaced element, leading to changes in oxidation states.

Double Displacement and Neutralization Reactions

Double displacement reactions, including neutralization reactions between acids and bases, generally involve the exchange of ions without any change in the oxidation states of the atoms. As a result, these reactions are not considered redox processes.

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