The Type of Reaction in an Voltaic Cell of Chemistry

The type of reaction in ап voltaic cell is best described as а nonspontaneous oxidation reaction С) spontaneous oxidation reaction, only J3) nonspontaneous oxidation-reduction reaction spontaneous oxidation-reduction reaction In а voltaic cell composed of two half-cells, ions are allowed to flow from one half-cell to another Ьу means of salt bridge С) а voltmeter В) electrodes D) ап extemal conductor (3) G;,) Тhе number of electrons !ПOVing in а wire is measured in А) joules В) ampheres The diagram below represents an voltaic cell, • D) degrees When switch S is closed, which particles undergo reduction? В) Cu atoms А) Zn2+ ions . Тhе diagram below represents а voltaic cell at 298 К. When the switch is closed, electrons flow from The diagram below represents а voltaic cell at 298 К and 1 atmosphere. Which specfes represents the cathode? Cu The diagram below represents а voltaic cell at 298 К. 7) V Switch дgО In the given reaction, the Ag + ions А) \ose e\ectrons д Given the overall cell reaction: Zn(s) + 2Ag+ (aq)---+ zri+2(aq) + 2Ag(s) """ Which of the following wШ occur as the cell operates? @11te concentratjon ofzn+2(aq) will increase. D) • The concentration of дg+( aq) wil\ increase. The overal\ reaction in а volt�ic cell is Zn(s) + Cu 2+ (aq)--> zn2+(�q) + �s). As the ·reaction in this cell takes place, the {,I А). mass ofthe Cu(s) electrode decreases В) zn _2,0) С) The amount of Ag(s) will decrease. _________,.., В) The amount of Zn(s) wШ increase. 9) �•in electrons С) gain protons В) lose protons 2+ (aq) concentration remains the same V ft-. С) Cu2+(aq) concentщtion remains the same ®n•ss ofthe Zn(sj elect.-ode decreases The diagram below represents а voltaic cell. The reaction occurs at 1 atmosphere and 298 К. Switch РЬ Zn (s) + РЬ +(aq) -'--1>- zn2+(aq) + рьО(s) What occurs when the switch is closed? � Zn is oxidized and electronsJ!ow to the РЬ electrode. Zn is reduced and electrons flow to the РЬ еlectrode. С) РЬ is oxidized and electrons flow to the Zn electrode. D) РЬ is reduced and electrons flow to the Zn electrode. 1i) ( Galvanic Cell Practice Vo l ta i c Cell V 1------, Voltmeter Wire Wire Cu(s) electrode Ag(s) electrode 1. What metal is oxidized?___l ,_,,_____ .=_,\л. 2. What metal is reduced?____-'-=-' ;)(- \1 -''(s ---- 3. What meta.l is the anode?___ _,l_,"'U,л______ 4: What metal is the cathode?____,_{j--'---C\ "¼-----5. Write the oxidation half reaction. \S 6. Write the гeduction halfreaction. 7. Write the overall balanced equation for the гeaction. �� \� �� � �� (-\t� (\ ""-J_ �U\9-М1А • 8. Which e]ectrode decreases in mass? Exp!ain in terms ofions and atoms why it decreases in mass. 9. What flows through the wire? • \j\t\.._ � • €..,,\�с.__,-\-rам �rо.м._ 0')(. +-о lQ. Explain the function of the salt bridge. �0\J�� � � 11. When the switch is closed, state the direction of electгon flow. 'f?-E-t:7 Voltmeter Switch Al(s) electrode -- Ni(s) electrode 1. What metal is oxidized?__�д-�\ ..,.,______ 2. What metal is reduced?___N'-""--'L =------3. Label the anode and cathode on the diagram. 4. Write tl1e oxidation halfreaction. 5. Write the reduction halfreaction. 6. Write the overall balanced equation for the reaction. 7. Labe] the direction of electron flo,.., on the diagram. � w\ ('{'_ � \.__ -\-о � L 8. Why is the salt bridge necessary? 9.: Is the reaction spontaneous? 1s the reaction endothermic or exothermic? /э�� Electrolytic Cell Questions Me.ta!!ic e.lements are obtairн�d from their ores Ьу reduction. Some melals, such as zшс, lead, iгon, and copper, -· ' • сал Ье obtained Ьу heatiлg their oxides with carbon. M ore active metals such as alцmiлum, magnesi1Jm, алd sodium, сап поt Ье reduced Ьу carbon. These meta)s can , Ье oblained Ьу the eJec!rolysis of their moHen (melted) ores. The diagram· below represents an iлcomp!ete се.11 for the electro!ysis of mollen NaCJ. The equa1ion ba!ow represents the reaction that occurs when the completed се.11 operat1:s. Wire Wire 0)( RE о Cathode Anode � i--lo-t\., (J11 ➔ d.-Nclt) +- tl-�Lo,,J о 1.J о !. Write the balanced halfreact:ioп for the reduction of Sodium ioпs to sodiшn atoшs. -н -1 N о._\- 1 + \ -е___ - ➔ Nсл._ 0 2. Write the balaпced !1alfгeaction for the oxidation of cl1loride ions to С12 3. Identify one metal froш the passage that is шаге active thaп саrЬоп and one шеtа] fгom tl1e passage that is Jess active fuaп саrЬоп (,\ l I t"\�) Nl\ t:.i,, t>ь" f€.. ) Lu.. 4. Ideпtify fue сошропеnt reqнired for the electrolysis of molten NaCJ that is missiпg froш the се!! diagram. ( 'C)ro,v-:, , О"'- +""L о\,,°'-�◊, м) \:J A.\t�f''- \ '. / t The apparatus shown )n U,e di ag гam consists oftwo inert platinum electrodes immersed in wa.ter. А smaJJ amount of ал e]ectrolyte Н2SQ!,, must Ье added to �he water for the reaction to tilke place. The eJe"ctrodes are connect�d to а source thal suppJies electricity H,(g) Platinum electrode Platinum electrode Battery S. What particles are provided Ьу the electrolyte fuat a!low an electric сшrепt to flow? 1-\ а�Оч "7 \-\-\- \Of\.'::, 6. The oxidation пumber ofthe охуgеп chaпges froш �o'\-Q- \о,'\.� to