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For the complete redox reactions given here,(i) break down each reaction into its half-reactions;(ii) identify the oxidizing agent; (iii) identify the reducing agent.(a) $2 \mathrm{Sr}+\mathrm{O}_{2} \longrightarrow 2 \mathrm{SrO}$(b) $2 \mathrm{Li}+\mathrm{H}_{2} \longrightarrow 2 \mathrm{LiH}$(c) $2 \mathrm{Cs}+\mathrm{Br}_{2} \longrightarrow 2 \mathrm{CsBr}$(d) $3 \mathrm{Mg}+\mathrm{N}_{2} \longrightarrow \mathrm{Mg}_{3} \mathrm{N}_{2}$

(a) By definition an oxidizing agent is the one that accepts electrons while a reducing agent donates electrons,Half reactions:$\mathrm{Sr} \rightarrow \mathrm{Sr}^{2+}+2 \mathrm{e}^{-}$ and $\mathrm{O}_{2}+4 \mathrm{e}^{-} \rightarrow 2 \mathrm{O}^{2-}$Oxidizing agent: $\mathrm{O}_{2}$Reducing agent: Sr(b)Half reactions:$\mathrm{Li} \rightarrow \mathrm{Li}^{+}+\mathrm{e}^{-}$ and $\mathrm{H}_{2}+2 \mathrm{e}^{-} \rightarrow \mathrm{2H}^{-}$Oxidizing agent: $\mathrm{H}_{2}$Reducing agent: Li(c)Half reactions:$\mathrm{Cs} \rightarrow \mathrm{Cs}^{+}+\mathrm{e}^{-}$ and $\mathrm{Br}_{2}+2 \mathrm{e}^{-} \rightarrow 2 \mathrm{Br}^{-}$Oxidizing agent : $\mathrm{Br}_{2}$Reducing agent : Cs(d)Half reactions:$\mathrm{Mg} \rightarrow \mathrm{Mg}^{2+}+2 \mathrm{e}^{-}$ and $\mathrm{N}_{2}+6 \mathrm{e}^{-} \rightarrow 2 \mathrm{N}^{3-}$Oxidizing agent : $\mathrm{N}_{2}$Reducing agent : Mg

Chemistry 102

Chapter 4

Reactions in Aqueous Solutions

Solutions

Aqueous Equilibria

Carleton College

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University of Kentucky

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Lectures

03:58

In chemistry, a solution is a homogeneous mixture composed of two or more substances. The term "solution" is also used to refer to the resultant mixture. The solution is usually a fluid. The particles of a solute are dispersed or dissolved in the solvent. The resulting solution is also called the solvent. The solvent is the continuous phase.

00:41

In chemistry, an ion is an atom or molecule that has a non-zero net electric charge. The name was coined by John Dalton for ions in 1808, and later expanded to include molecules in 1834.

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For the complete redox rea…

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03:41

For the redox reactions li…

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Determine whether each rea…

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we'll be looking at to the complete was four completely. Ducks equals equations and we will be one finding the to half the actions, the each and two. We will be finding the oxidizing agent involved, and clearly we'll be finding the reducing agent involved. So the first of really docks equation will be too stoned, impossible to yields to stroll into oxide. So since these two wasn't elemental male, it states the each average wages you. But in this compound study, um, has a two plus charge in Austin. Have a to minus charge. So when we look at the oxidizing, half the action and the reducing deduction have the action, we'll find that still on him is oxidized since it gains new luck turns. Um, since all the coefficients can be divided by two, we will be doing just that and for the reduction of question will go to plus four U minus. Yields to O to minus with the oxidizing needn't as oxygen, since it is what is adduced and the introducing agent as Dylan team, which oxidize so for the second completely docks equation, we have to with him plus Midge to Gus meals to Ally These are the ones the gun industry ended. States, I have a plus one charge. I didn't have a plus minus one charge. Now we can let out by half reactions. Knock those oxidation. Have the action is lift them yields. Let them plus plus one. A lot done. Since we started off with to elect owns two lithium Adams. We would technically have to before the each of these parts of the equation. But since the all balance hope, it's just one gust. Boyd, Time for the doctor. Have a question we have to which to were aged two plus tu minus yields to huge minus. So now we have the huh oxidizing agent as hydrogen, where the owner that's reduced and me reducing agent as lithium boiled element that is oxidized and the next completely docks. The action is to caesium. Plus, we are too heels to see us b horror. Once again, these in the standard states he's a mother plus one charge of them has a minus one charge. So the half of the actions we have caesium to seize to just cesium meals caesium plus plus one electron and two plus two fields to the uh, minus. Would the oxidizing you don't has? And the the Duce Nu agent caesium. So on final completely leader, the docks and the action is the American Museum plus, like to June yields like museum, too. From this weekend, we know that magnesium have a two plus the nitrogen has three minus charge and we can I have half the actions as fall wounds. The oxidation reaction will be doing magnesium build stilling magnesium to plus plus six electrons. Let's in. All of these cowfish is indivisible by three. We will simply say that that's magnesium, magnesium to both plus two tons and for the reduction of question. Dejan plus six u minus meals to nitrogen three minus with our Bach said, dies in agent as my Children. And, uh, the do sing agent has magnesium.

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