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Semiconductors
Superconductivity
Doping (Semiconductor)
Boron
Chapter 21 Review Questions
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Chapter 21 Review Questions
General Chemistry I
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June 2018
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General Chemistry: Atoms First, 2e (McMurry and Fay) Chapter 21 Metals and Solid-State Materials 21.1 Multiple Choice Questions 1) What are the most abundant minerals in the earth's crust? A) aluminosilicates and silicates B) chlorides and iodides C) nitrates and phosphates D) oxides and sulides Ans!er" A Di" 1 #opic" #opic" $ection 21.1 $ources o the Metallic Metallic %lements 2) What minerals are important commercial sources o metals? A) aluminosilicates and silicates B) chlorides and iodides C) nitrates and phosphates D) oxides and sulides Ans!er" D Di" 1 #opic" #opic" $ection 21.1 $ources o the Metallic Metallic %lements &) What is a principal commercial ore or the element aluminum? A) bauxite B) chalcoprite C) chromite D) hematite Ans!er" A Di" 1 #opic" #opic" $ection 21.1 $ources o the Metallic Metallic %lements () What is a principal commercial ore or the element iron? A) cassiterite B) cinnabar C) alena D) hematite Ans!er" D Di" 1 #opic" #opic" $ection 21.1 $ources o the Metallic Metallic %lements 1 Copyright © 2014 Pearson Education, Inc. *) What is the most important copper containin ore? A) cassitrite B) chalcoprite C) chromite D) cinnabar Ans!er" B Di" 1 #opic" #opic" $ection 21.1 $ources o the Metallic Metallic %lements +) What metal is isolated rom the ore alena? A) lead B) mananese C) tin D) ,inc Ans!er" A Di" 1 #opic" #opic" $ection 21.1 $ources o the Metallic Metallic %lements -) What metal is isolated rom the ore sphalerite? A) copper B) mananese C) titanium D) ,inc Ans!er" D Di" 1 #opic" #opic" $ection 21.1 $ources o the Metallic Metallic %lements ) What metal is isolated rom the ore rutile and !hat is the chemical ormula o rutile? A) aluminum/ Al20& x20 B) mananese/ Mn02 C) tin/ $n02 D) titanium/ #i02 Ans!er" D Di" 1 #opic" #opic" $ection 21.1 $ources o the Metallic Metallic %lements 2 Copyright © 2014 Pearson Education, Inc. 3) What statement is inconsistent concernin the correlation o the chemical compositions o the most common ores !ith the locations o their metals in the periodic table? A) 4old and the platinum5roup metals 67u/ 0s/ 7h/ 8r/ 9d/ and 9t) are suicientl unreacti:e to occur commonl as the ree metals. B) #he earl transition metals on the let side o the d bloc; enerall occur as oxides ox ides !hile the more electroneati:e/ late transition metals on the riht side o the d bloc; occur as sulides. C) #he more electroneati:e p5bloc; metals are commonl ound as oxides and nitrates except or Al and $n !hich are ound as sulides. D) #he s5bloc; metals are ound in nature as carbon ates/ silicates and in the case o
) Which o the ollo!in metals occurs in nature principall as oxide ores? A) Ca B) Co C) Cr D) Cu Ans!er" C Di" 1 #opic" #opic" $ection 21.1 $ources o the Metallic Metallic %lements 11) Which substance is commonl ound in nature in an uncombined orm? A) aluminum B) iron C) platinum D) tin Ans!er" C Di" 1 #opic" #opic" $ection 21.1 $ources o the Metallic Metallic %lements 12) Which o the ollo!in elements is most li;el to occur as a metal sulide ore? A) B) C) = D) W Ans!er" B Di" 1 #opic" #opic" $ection 21.1 $ources o the Metallic Metallic %lements 3 Copyright © 2014 Pearson Education, Inc. 1&) Which o the ollo!in elements is most li;el to naturall occur as a carbonate? A) Ca B) Co C) Cr D) Cu Ans!er" A Di" 1 #opic" #opic" $ection 21.1 $ources o the Metallic Metallic %lements 1() What is not a metallur process? A) en:ironmental reconstruction o the landscape B) extraction o metals rom their ores C) ma;in o allos and metallic composites D) reduction o the mineral to the ree metal Ans!er" A Di" 1 #opic" #opic" $ection 21.2 Metallur 1*) Which o the ollo!in steps is not al!as necessar in the extraction o a metal rom its ore? A) chemical treatment prior to reduction B) concentration o the ore C) reduction o the mineral to the ree metal D) reinin or puriication o the metal Ans!er" A Di" 1 #opic" #opic" $ection 21.2 Metallur 1+) What is the concentration process used to separate chalcoprite 6Cue$2) rom its anue? A) chemical treatment B) densit dierences C) loatation process D) manetic dierences Ans!er" C Di" 1 #opic" #opic" $ection 21.2 Metallur 1-) o! is sla separated rom molten ore in a blast urnace? A) chemical treatment B) densit dierences C) distillation D) manetic dierences Ans!er" B Di" 1 #opic" #opic" $ection 21.2 Metallur 4 Copyright © 2014 Pearson Education, Inc. 1) What is the name o the process commonl associated !ith the isolation and concentration o Al20& rom the ore bauxite 6Al20& x20)? A) basic oxen process B) baer process C) contact process D) mond process Ans!er" B Di" 1 #opic" #opic" $ection 21.2 Metallur 13) #he chemical process o roastin is commonl used to acilitate the reduction o !hich metal ores? A) A/ Cu/ and B) Al/ M/ and
) When ,inc sulide underoes roastin/ the products are A) n and $. B) n and 2$. C) n0 and $. D) n0 and $02. Ans!er" D Di" 1 #opic" #opic" $ection 21.2 Metallur 21) What is not an appropriate method o isolatin the metals sho!n? A) $6 s) s) 026 g g ) heat 6 g ) $026 g g ) B) n06 s) s) C6 s) s) heat n6 g ) C06 g ) C) W0&6 s) s) & 26 g g ) heat W6 s) s) & 206 g g ) D) Al20&6 s) s) 2 Cr6 s) s) heat Cr 20&6 s) s) 2 Al6l Al6l ) Ans!er" D Di" 1 #opic" #opic" $ection 21.2 Metallur 5 Copyright © 2014 Pearson Education, Inc. 22) o! does one commerciall reduce the metal oxides or chlorides o sodium and manesium? A) electrolsis o the molten salts B) hih temperature reduction !ith aluminum C) hih temperature reduction !ith carbon D) roastin Ans!er" A Di" 1 #opic" #opic" $ection 21.2 Metallur 2&) Which o the ollo!in metals is not commonl obtained b electrolsis? A) Al B) i C)
G ,inc sulide? A) 1+> B) 2&> C) (+> D) ++> Ans!er" A Di" 2 #opic" #opic" $ection 21.2 Metallur 23) $teel is a mixture composed primaril o A) iron and carbon. B) iron and copper. C) iron and silicon. D) iron and sulur. Ans!er" A Di" 1 #opic" #opic" $ection 21.& 8ron 8ron and $teel $teel &>) Wh is CaC0& added to a blast urnace in the steel ma;in process? A) to i:e a source o C0 2 B) to remo:e basic oxides rom the iron ore o re C) to remo:e silicates rom the iron ore D) to remo:e unreacti:e carbon rom the iron ore Ans!er" C Di" 2 #opic" #opic" $ection 21.& 8ron 8ron and $teel $teel &1) Wh is silicon dioxide added to molten iron in the basic oxen process? A) to remo:e acidic oxides rom the molten iron B) to remo:e mananese oxide rom the molten iron C) to remo:e phosphates and carbonates carbon ates rom the molten iron D) to remo:e trace amounts o carbon rom the molten iron Ans!er" B Di" 2 #opic" #opic" $ection 21.& 8ron 8ron and $teel $teel 7 Copyright © 2014 Pearson Education, Inc. &2) What is not a primar inredient used in the production o iron b the blast urnace process? A) co;e B) iron ore C) limestone D) phosphates and silicates Ans!er" D Di" 1 #opic" #opic" $ection 21.& 8ron 8ron and $teel $teel &&) What is not a maHor component o sla? A) Ca$i0& B) Ca&690()2 C) e20& D) Mn$i0& Ans!er" C Di" 2 #opic" #opic" $ection 21.& 8ron 8ron and $teel $teel &() 8n the reaction sho!n belo! calcium phosphate sla is ormed rom a reaction o calcium oxide !ith phosphoric anhdride. + Ca06 s) s) 9(01>6l ) 2 Ca&690()26l ) Ca0 is a6n) IIIIIIII oxide/ and 9(01> is a6n) IIIIIIII oxide. A) acidic/ acidic B) acidic/ basic C) basic/ acidic D) basic/ basic Ans!er" C Di" 1 #opic" #opic" $ection 21.& 8ron 8ron and $teel $teel &*) #o three three siniicant iures/ ho! man metric tons o iron ore are needed to produce 1>/>>> metric tons o iron per da in the blast urnace process? Assume Assume that the iron ore is iron6888) oxide and that the ore is ->.>G pure. #he reaction o interest is A) 1(/&>> metric tons B) 2>/>>> metric tons C) 2>/(>> metric tons D) &>/>>> metric tons Ans!er" C Di" 2 #opic" #opic" $ection 21.& 8ron 8ron and $teel $teel Copyright © 2014 Pearson Education, Inc. &+) What terminolo best describes the bondin in the ollo!in schematic o a metal? A) ionic bondin B) co:alent bondin C) electron5sea model D) crstal model Ans!er" C Di" 1 #opic" #opic" $ection 21.( Bondin in Metals &-) Which metal has maximum illin o bondin molecular orbitals and minimal illin o antibondin molecular orbitals in its composite s-d composite s-d band? band? A) Au B) Cs C) 7e D) W Ans!er" D Di" & #opic" #opic" $ection 21.( Bondin in Metals &) Which o the ollo!in is the sotest and most maleable? A) Cu B) @ C) 7u D) Mn Ans!er" A Di" & #opic" #opic" $ection 21.( Bondin in Metals &3) Which substance is the best conductor o electricit? A) diamond B) ermanium C) old D) phosphorus Ans!er" C Di" 1 #opic" #opic" $ection 21.( Bondin in Metals Alo. 0ption" alorithmic ! Copyright © 2014 Pearson Education, Inc. (>) Metals are ood conductors o heat because A) the :alence electrons are ree to mo:e about the crstal lattice. B) heat is carried as ;inetic ener b rapid :ibrations rom atom to atom in the crstal lattice. C) metal cations in the crstal are eicient at transportin heat. D) holes are created in the crstal lattice as electrons enter the conduction band and the holes conduct the heat !hile electrons conduct electrical chare. Ans!er" A Di" 2 #opic" #opic" $ection 21.( Bondin in Metals (1) Which one o the ollo!in metals is expected to ha:e the hihest meltin point? A) Cd B) Cr C) D) n Ans!er" B Di" & #opic" #opic" $ection 21.( Bondin in Metals Alo. 0ption" alorithmic (2) %lectrical resistance o a metal IIIIIIII !ith increasin temperature. A) can decrease or increase B) decreases C) does not chane D) increases Ans!er" D Di" 1 #opic" #opic" $ection 21.( Bondin in Metals (&) What tpe o substances exhibit an increase in conducti:it !ith an increase in temperature? A) both metals and semiconductors B) onl insulators C) onl metals D) onl semiconductors Ans!er" D Di" 1 #opic" #opic" $ection 21.* $emiconductors 10 Copyright © 2014 Pearson Education, Inc. (() White tin has an electrical conducti:it that decreases !ith increasin temperature/ an d ra tin has an electrical conducti:it conducti:it that increases !ith increasin increasin temperature. #hereore/ !hite tin is classiied as a6n) IIIIIIII/ and ra tin is classiied as a6n) IIIIIIII. A) insulator/ metal B) metal/ insulator C) metal/ semiconductor D) semiconductor/ metal Ans!er" C Di" 1 #opic" #opic" $ection 21.* $emiconductors (*) Which o the ollo!in is a semiconductor? A) Al B) B C) 4a D) 9b Ans!er" B Di" 1 #opic" #opic" $ection 21.* $emiconductors (+) Which one o the ollo!in is an electrical insulator? A) alumina B) ermanium doped !ith antimon C) old D) tellurium Ans!er" A Di" 2 #opic" #opic" $ection 21.* $emiconductors Alo. 0ption" alorithmic (-) Which substance is a ood semiconductor? A) diamond B) ermanium C) old D) phosphorus Ans!er" B Di" 1 #opic" #opic" $ection 21.* $emiconductors () Which substance has a larer band ap than silicon? A) diamond B) copper C) ermanium D) sil:er Ans!er" A Di" 1 #opic" #opic" $ection 21.* $emiconductors 11 Copyright © 2014 Pearson Education, Inc. (3) Which element has the larest ener band ap? A) C 6diamond) B) $i C) 4e D) $n 6!hite) Ans!er" A Di" 1 #opic" #opic" $ection 21.* $emiconductors *>) Which element has the smallest ener band ap? A) C 6diamond) B) 4e C) 9b D) $i Ans!er" C Di" 1 #opic" #opic" $ection 21.* $emiconductors Alo. 0ption" alorithmic *1) o! !ould one classi a ermanium ermanium crstal doped !ith arsenic? A) conductor B) n5tpe semiconductor C) p5tpe semiconductor D) insulator Ans!er" B Di" 1 #opic" #opic" $ection 21.* $emiconductors *2) o! !ould one classi copper mixed !ith tin? A) conductor B) n5tpe semiconductor C) p5tpe semiconductor D) insulator Ans!er" A Di" 2 #opic" #opic" $ection 21.* $emiconductors *&) o! !ould one classi a silicon crstal doped !ith indium? A) conductor B) n5tpe semiconductor C) p5tpe semiconductor D) insulator Ans!er" C Di" 1 #opic" #opic" $ection 21.* $emiconductors 12 Copyright © 2014 Pearson Education, Inc. *() Which one o the ollo!in is an n5tpe n 5tpe o semiconductor? A) alumina B) ermanium doped !ith antimon C) ermanium doped !ith boron D) tellurium Ans!er" B Di" 1 #opic" #opic" $ection 21.* $emiconductors **) Which one o the ollo!in is a p5tpe o semiconductor? A) ermanium doped !ith antimon B) ermanium doped !ith boron C) tellurium D) JBa2Cu&0Ans!er" B Di" 1 #opic" #opic" $ection 21.* $emiconductors *+) Which combination o semiconductors can be emploed to ma;e a diode? A) 4aAs doped !ith 4e and 4a9 doped !ith $i B) 4aAs doped !ith $e and 4a9 doped !ith n C) $i doped !ith B and 4e doped !ith 4a D) $i doped !ith 9 and 4e doped !ith As Ans!er" B Di" ( #opic" #opic" $ection 21.+ $emiconductor Applications *-) Which statement about a diode laser is false? A) iht is emitted !hen a re:erse bias is applied to the p5n Hunction. B) %lectrons and holes recombine at the p5n Hunction. C) A laser ca:it relects the emitted liht bac; and orth to pro:ide stimulated emission. D) #he liht emerin rom the laser possesses eat intensit/ a sinle reEuenc/ and a sinle phase. Ans!er" A Di" 2 #opic" #opic" $ection 21.+ $emiconductor Applications *) 9hoto:oltaic cells use liht to A) excite electrons into the conduction band b and o a n5tpe semiconductor. B) excite electrons into the conduction band b and o a p5tpe semiconductor. C) excite holes into the conduction band o a n5tpe semiconductor. D) excite electrons into the :alence band b and o a p5tpe semiconductor. Ans!er" A Di" 2 #opic" #opic" $ection 21.+ $emiconductor Applications 13 Copyright © 2014 Pearson Education, Inc. *3) A liht emittin diode !ith a band ap o 11 ;KLmol emits liht in !hat reion o the electromanetic radiation spectrum? A) inrared B) ultra:iolet C) :isible 5 blue D) :isible 5 red Ans!er" D Di" 1 #opic" #opic" $ection 21.+ $emiconductor Applications +>) Which one o the ollo!in is a metallic conductor at room temperature but a superconductor at 1 =? A) diamond B) raphite C) ullerene D) potassium ulleride Ans!er" D Di" 1 #opic" #opic" $ection 21.- $uperconductors +1) A particular superconductor has eiht copper atoms on corners and eiht copper atoms on edes o its unit cell. o! man copper atoms are attributed attributed to a sinle unit cell o this superconductor? A) 1 B) & C) * D) 1+ Ans!er" B Di" 1 #opic" #opic" $ection 21.- $uperconductors +2) What is the a:erae oxidation state o Cu in Ca2Ba2Cu&05x i is in the 2 oxidation state? A) 1 B) 2 C) 52 5 2xL& D) 2 2xL& Ans!er" C Di" ( #opic" #opic" $ection 21.- $uperconductors 14 Copyright © 2014 Pearson Education, Inc. +&) What is the a:erae oxidation number o Cu in the 1525& superconductor JBa2Cu&0- i J is in the & oxidation state? A) 2 B) 2.&& C) & D) &.&& Ans!er" B Di" & #opic" #opic" $ection 21.- $uperconductors +() Who disco:ered the phenomenon o superconducti:it in 1311? A) K. 4. Bednor, B) 7. B. uller C) =. A. M ller ller D) . =. 0nnes Ans!er" D Di" 1 #opic" #opic" $ection 21.- $uperconductors +*) What element !as ound to be the irst superconductor o electricit at (.2 = in 1311? A) copper B) iron C) allium D) mercur Ans!er" D Di" 1 #opic" #opic" $ection 21.- $uperconductors ++) Belo! the superconductin transition temperature #c/ superconductors A) become perect conductors. B) become perect manets. C) become perect resistors. D) ail to !or;. Ans!er" A Di" 1 #opic" #opic" $ection 21.- $uperconductors +-) What is the Meissner eect associated !ith superconductors? A) !hen the temperature abo:e !hich the superconductor ails to !or; B) !hen the temperature at !hich the superconductors become perect insulators C) !hen the net manetic ield !ithin the bul; o the superconductor is ,ero D) !hen the net manetic ield !ithin the bul; o the superconductor becomes nearl ininite Ans!er" C Di" 1 #opic" #opic" $ection 21.- $uperconductors +) What structural eatures appear necessar or superconducti:it in the 1525& JBa2Cu&015 Copyright © 2014 Pearson Education, Inc. superconductor? A) hih metallic character. B) ininite extended laers o Cu and 0 atoms and a ractional oxidation state or Cu C) presence o an inner transition element D) all o the abo:e statements Ans!er" B Di" 2 #opic" #opic" $ection 21.- $uperconductors +3) Which has been ound to be a three dimensional superconductor that cond ucts eEuall in all directions? A) C 6diamond) B) C 6raphite) C) = &C+> D) JBa2Cu&0Ans!er" C Di" 2 #opic" #opic" $ection 21.- $uperconductors ->) Wh are ceramics superior supe rior to metals as structural materials? A) Ceramics are easier to abricate into shapes than metals. B) Ceramics are more malleable than metals. C) Ceramics are more resistant to !ear and corrosion than metals. D) Ceramics ha:e reater impact resistance than metals. Ans!er" C Di" 1 #opic" #opic" $ection 21. Ceramics -1) Which process is used in the abrication o ceramics? A) electrolsis B) reduction C) roastin D) sinterin Ans!er" D Di" 1 #opic" #opic" $ection 21. Ceramics -2) $interin is A) a iltration process throuh a molecular sie:e. B) the process o heatin particles o a po!der belo! the meltin point so that the use toether. C) the process o rapid coolin o a material to ield a superconductin mixture. D) the process o remo:in metals rom ore b passin material throuh a manetic ield. Ans!er" B Di" 1 #opic" #opic" $ection 21. Ceramics -&) Wh are ceramics so much more brittle than metals? 16 Copyright © 2014 Pearson Education, Inc. A) #he bondin in ceramics has a :er : er hih deree o ionic bondin character. B) #he bondin in ceramics has a :er hih deree o pi bondin character. C) #he bondin in ceramics is hihl nondirectional. D) #he locali,ed bondin in ceramics is hihl d irectional. Ans!er" D Di" 2 #opic" #opic" $ection 21. Ceramics -() What substance has a ratin o 1> on the Mohs hardness scale? A) alumina B) aluminum C) diamond D) talc Ans!er" C Di" 1 #opic" #opic" $ection 21. Ceramics -*) What is the name o the oxide ceramic Be0? A) berllia B) berllic C) berllium ceramic D) berllium oxide Ans!er" A Di" 1 #opic" #opic" $ection 21. Ceramics -+) What is not enerall considered to be a ceramic? A) indium/ 8n B) silica/ $i0 2 C) silicon nitride/ $i& <( D) ,irconia/ i02 Ans!er" A Di" 1 #opic" #opic" $ection 21. Ceramics --) What is the coordination number o $i in $iC that has a diamond5li;e structure? A) 1 B) 2 C) ( D) + Ans!er" C Di" 2 #opic" #opic" $ection 21. Ceramics 17 Copyright © 2014 Pearson Education, Inc. -) What is the sol5el process? A) a series o chemical steps that in:ol:es the isolation o Cu$ and then roastin !ith oxen B) a series o chemical steps that in:ol:es the isolation o $0& and then treatment !ith 2$0( C) a series o chemical steps that in:ol:es the snthesis o a metal oxide po!der rom a metal al;oxide D) a series o chemical steps that in:ol:es the thermal d ecomposition o ibers o polacrlonitrile Ans!er" C Di" 1 #opic" #opic" $ection 21. Ceramics -3) What is not part o the sol5el process or the production o titania? A) #iCl( ( 0C2C& ( <& #i60C2C&)( ( <(Cl 6in ben,ene) B) #i60C2C&)( ( 20 #i60)( ( 0C2C& C) 60)&5#i50 05#i560)& 60)&5#i505#i60) & 20 D) ( #i60)( heat 2 #i20& 20 02 Ans!er" D Di" 2 #opic" #opic" $ection 21. Ceramics >) $ilica 6$i02) can be prepared rom silicon ethoxide b the sol5el process. Write a balanced eEuation or the hdrolsis o silicon ethoxide. A) $iCl( ( 0C2C& ( <& $i60C2C&)( ( <(Cl 6in ben,ene) B) $i60C2C&)( ( 20 $i60)( ( 0C2C& C) $i60C2C&)( ( 0C& $i60C&)( ( 0C2C& D) $i60C&)( ( 20 $i60)( ( 0C& Ans!er" B Di" 2 #opic" #opic" $ection 21. Ceramics 1) What is a cermet? A) boron nitrideLepox B) ceramic5metal composite C) ceramic5polmer composite D) silicon carbideLraphite Ans!er" B Di" 1 #opic" #opic" $ection 21.3 Composites 1 Copyright © 2014 Pearson Education, Inc. 2) $ilicon nitrideL,irconia is a example o a A) ceramic5ceramic composite. B) ceramic5metal composite. C) ceramic5polmer composite. D) superconductor. Ans!er" A Di" 2 #opic" #opic" $ection 21.3 Composites &) 7elati:e to a bul; sample o old/ nanoparticles o old ha:e A) reater reacti:it and hiher meltin point. B) reater reacti:it and lo!er meltin point. C) lo!er reacti:it and hiher meltin point. D) lo!er reacti:it and lo!er meltin point. Ans!er" B Di" 1 #opic" #opic" J8 Will Will the
) Which o these elements is li;el to be extracted rom its ore b electrolsis? A) element A B) element B C) element C D) element D Ans!er" A Di" 1 #opic" #opic" Conceptual 9roblems 20 Copyright © 2014 Pearson Education, Inc. se the picture belo! to ans!er the ollo!in Euestions. 31) What diaram !ould describe the molecular orbital picture or the species
>) Which o these materials has an electrical conducti:it that remains constant !ith an increase in temperature? A) material 61) B) material 62) C) material 6&) D) material 6() Ans!er" D Di" 1 #opic" #opic" Conceptual 9roblems 23 Copyright © 2014 Pearson Education, Inc. #he ollo!in pictures sho! the electron populations o the composite s-d composite s-d bands bands or our dierent transition metals. 1>1) Which metal has the hihest meltin point? A) metal 61) B) metal 62) C) metal 6&) D) metal 6() Ans!er" C Di" & #opic" #opic" Conceptual 9roblems 1>2) Which metal has the lo!est meltin point? A) metal 61) B) metal 62) C) metal 6&) D) metal 6() Ans!er" D Di" & #opic" #opic" Conceptual 9roblems 1>&) Which is the hardest metal? A) metal 61) B) metal 62) C) metal 6&) D) metal 6() Ans!er" C Di" & #opic" #opic" Conceptual 9roblems 24 Copyright © 2014 Pearson Education, Inc. #he ollo!in pictures sho! the electron populations o the composite s-d composite s-d bands bands or $c/ #i/ @/ and n. 1>() Which picture corresponds to $c? A) picture 61) B) picture 62) C) picture 6&) D) picture 6() Ans!er" A Di" 1 #opic" #opic" Conceptual 9roblems 1>*) Which picture corresponds to #i? A) picture 61) B) picture 62) C) picture 6&) D) picture 6() Ans!er" B Di" 1 #opic" #opic" Conceptual 9roblems 1>+) Which picture corresponds to @? A) picture 61) B) picture 62) C) picture 6&) D) picture 6() Ans!er" C Di" 1 #opic" #opic" Conceptual 9roblems 25 Copyright © 2014 Pearson Education, Inc. 1>-) Which picture corresponds to n? A) picture 61) B) picture 62) C) picture 6&) D) picture 6() Ans!er" D Di" 1 #opic" #opic" Conceptual 9roblems #he ollo!in pictures sho! the electron populations o the composite s composite s - d bands bands or J/ Mo/ A/ and Cd. 1>) Which picture corresponds to J? A) picture 61) B) picture 62) C) picture 6&) D) picture 6() Ans!er" A Di" 1 #opic" #opic" Conceptual 9roblems 1>3) Which picture corresponds to Mo? A) picture 61) B) picture 62) C) picture 6&) D) picture 6() Ans!er" B Di" 1 #opic" #opic" Conceptual 9roblems 26 Copyright © 2014 Pearson Education, Inc. 11>) Which picture corresponds to A? A) picture 61) B) picture 62) C) picture 6&) D) picture 6() Ans!er" C Di" 1 #opic" #opic" Conceptual 9roblems 111) 111) Which picture corresponds to Cd? A) picture 61) B) picture 62) C) picture 6&) D) picture 6() Ans!er" D Di" 1 #opic" #opic" Conceptual 9roblems #he ollo!in picture sho!s the electron populations o the bands o M0 ener le:els or elementar silicon. 112) 8n this picture the band ap is i:en b letter6s) A) a. B) b. C) c. D) a and b. Ans!er" B Di" 1 #opic" #opic" Conceptual 9roblems 11&) 8n this picture the conduction band is i:en b letter6s) A) a. B) b. C) c. D) a and b. Ans!er" A Di" 1 #opic" #opic" Conceptual 9roblems 27 Copyright © 2014 Pearson Education, Inc. 11() 8n this picture the :alence band is i:en b letter6s) A) a. B) b. C) c. D) a and b. Ans!er" C Di" 1 #opic" #opic" Conceptual 9roblems 11*) Which picture represents a p5tpe $i semiconductor? A) picture 6A) B) picture 6B) C) both picture 6A) and picture 6B) D) neither picture 6A) nor picture 6B) Ans!er" A Di" 2 #opic" #opic" Conceptual 9roblems 11+) Which picture represents an n5tpe $i $ i semiconductor? A) picture 6A) B) picture 6B) C) both picture 6A) and picture 6B) D) neither picture 6A) nor picture 6B) Ans!er" B Di" 2 #opic" #opic" Conceptual 9roblems 2 Copyright © 2014 Pearson Education, Inc. 9icture 61) sho!s the electron populations o the b ands o M0 ener le:els or elementar silicon. 11-) Which picture 61)56() sho!s the electron populations !hen the silicon is doped !ith allium? A) picture 61) B) picture 62) C) picture 6&) D) picture 6() Ans!er" C Di" 2 #opic" #opic" Conceptual 9roblems 11) Which picture 61)56() sho!s the electron populations !hen the silicon is doped !ith arsenic? A) picture 61) B) picture 62) C) picture 6&) D) picture 6() Ans!er" B Di" 2 #opic" #opic" Conceptual 9roblems 2! Copyright © 2014 Pearson Education, Inc. 113) Which schematic best represents the electrical resistance :ersus temperature cur:e or a superconductor? A) A B) B C) C D) none o these Ans!er" A Di" 1 #opic" #opic" Conceptual 9roblems 21.2 Alorithmic Alorithmic Questions 1) Which substance is the best conductor o electricit? A) arsenic B) boron C) sil:er D) tellurium Ans!er" C Di" 1 #opic" #opic" $ection 21.( Bondin in Metals Alo. 0ption" alorithmic 2) Which one o the ollo!in metals is expected to ha:e the hihest meltin point? A) a B)
> milliseconds aster than con:entional incandescent bra;e lihts. lihts. #he aster illumination illumination i:es the dri:er o a trailin car an additional stoppin distance o IIII IIII eet at ** mph. Ans!er" 1+ Di" 2 #opic" #opic" $ection 21.+ $emiconductor Applications -) #he !a:elenth o liht emitted b the 4a9>.(>As>.+> %D/ !hich has a band ap o 11 ;KLmol/ is IIIIIIII nm. Ans!er" ++1 Di" ( #opic" #opic" $ection 21.+ $emiconductor Applications )
) Because nanoparticles ha:e a larer percentae o atoms on the surace o the nanoparticle than on the surace o bul; material/ nanoparticles ha:e IIIIIIII meltin points and IIIIIIII chemical reacti:it than the bul; material. Ans!er" lo!er/ reater Di" 2 #opic" #opic" J8 Will Will the
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Chapter 21 Review Questions