ChiTCng CROM - SAT - DONG Bai 38 CROM A MUC TIEU BAI HOC Ki§n thii'c HS biit: • Vi tri cua crom bang tuan hoan, eau hinh electron nguyen tir • Tinh chat vat li va tinh chat boa hgc cua crom HS hiiu: • Tai eau hinh eiia crom d trang thai ca ban cd electron ddc than • Phuang phap san xuat crom KT nang • Viet phuang trinh boa bieu dien tinh chat boa bgc ciia crom va hgp chat crom • Giai bai tap ve crom Tinh cam, thai Crom la kim loai HS chi biet qua hgp chat K2Cr207, viec nghien ciiu ve crom tao himg thu kham pha kien thire mdi B C H U A N B! C U A GV vA HS • GV: - Bang tuan hoan cac nguyen td hoa hgc - Dung eu: Chen sir, dng nghiem, gia thi nghiem, den cdn • HS: Xem trudc ndi dung bai hgc 190 C TI^N TRJNH DAY - HOC Hogt dpng cda GV Hogt dpng cua HS Hogt dpng I I VI TRI VA CAU TAO Vi tri cua crom bang tuan hoan GV chieu len man hinh bang tuin hoan HS quan sat bang tuan hoan va nhan xet yeu cau HS - Xac dinh sd thir tu eiia crom - Crom cd sd thii tu la 24 - Xac dinh vi tri eiia crom bang - Crom thudc chu ky 4, nhdm VIB ciia tuan hoan bang tuan hoan Cau tao ciia crom GV gidi thieu: HS nghe giang va ghi bai - Viet cau hinh electron nguyen tir - c i u hinh ls^2s^2p^3s^3p^3d^4s' Cau hinh crom cd sir nhay electron tir phan ldp 4s sang phan ldp 3d dl ed ciu hinh ban bao hoa ben t i f I f I t i l l [U - Phan bd eac electron va cae d lugng tir - Nhan xet ve sd ldp e va so e ddc than 3d- 4s' - Crom cd ldp electron va electron ddc than - Tir sir phan bd e du doan sd oxi hoa - Trong hgp chat crom cd the ed sd oxi hoa tir+1 den +6 cd the ed eiia crom GV luu y HS: Trong hgp chat crom cd sd oxi hoa tir +1 din +6 nhung sd oxi hoa ben thudng gap la +2, +3, +6 Hogt dpng II TINH CHAT VAT LI GV eho HS nghien ciiu SGK va yeu HS nghien ciiu SGK va nhan xet ciu HS neu tinh chit vat li cua crom 191 Hogt dpng cda GV Hogt dpng cda HS Crom la kim loai cd mau tring anh bac, khdi lugng rieng ldn d = 7,2 g/cm , khd ndng chay t°j.= 1890 C, crom la kim loai cirng nhat Hogt dpng III TINH CHAT HOA HOC Tac dung voi phi kim GV thdng bao: Crom ed tinh khir HS viet cae phan iing hoa bgc manh Cr ^ Cr^" + 2e Cr -^ Cr^" + 3e Crom tac dung vdi oxi, clo, lim huynh tao crom (III) yeu cau HS viet eac phan img hoa hgc tren 4Cr + 3O2 — ^ 2Cr203 2Cr + 3CI2 ^ ^ 2CrCl3 GV luu y: nhiet thudng crom cd ldp oxit ben bao ve (gidng nhdm) nen khdng tac dung vdi oxi, d nhiet cao tac dung dugc nhieu phi kim 2Cr + 3S ^ ^ Cr2S3 Tac dung voi nude GV cho HS nghien cim SGK va yeu cau HS giai thich tai crom la kim loai boat ddng nhung thuc te lai khdng tac dung vdi nude HS nghien ciiu SGK va nhan xet Tuy la kim loai boat ddng manh nhung cd ldp mang oxit ben bao ve (gidng nhdm) Nen thu te crom khdng tac dung vdi nude Tac dung voi axit GV gidi thieu: - Crom tan tdt dung dich HCl, H2SO4 loang tao mudi crom (II) va hidro 192 HS nghe giang va viet phan img hoa hgc Hogt dpng cda GV - Hogt dpng cua HS Crom khdng tan HNO3, H2SO4 dac ngudi ed ldp oxit bin bao ve (bi thu ddng hoa gidng Al, Fe) Yeu cau HS viet phan irng cua crom vdi dung dich HCl, H2SO4 loang Cr + 2HC1 > CrCl2 + H2 Cr + H2SO4 > CrS04 + H2 Hogt dpng IV iTNG DUNG GV chieu len man hinh tranh anh mieu ta eac img dung ciia crom Yeu cau HS nen eac img dung ciia crom HS quan sat va nhan xet Crom ed nhieu img dung kT thuat: - Che tao thep dac biet - Dimg de ma bao ve kim loai va tao ve dep cho dd vat Hogt dpng V SAN XUAT GV cho HS nghien ciru SGK yeu cau HS nghien eiiu SGK va nhan xet HS neu phuang phap dieu che crom Trong tu nhien crom tdn tai d dang hgp chat, quang chii yeu ciia crdm la crdmit: FeO.Cr203 Phuang phap dieu che chii yeu: Tach Cr203 khdi quang, rdi dimg phuang phap nhiet nhdm Cr203 + Al — ^ 2Cr + AI2O3 Hogt dpng CUNG CO BAI VA BAI TAP VE NHA GV chilu cac bai tap sau len man HS quan sat theo luan cho ket qua hinh cho HS thao luan cimg cd ndi dung bai hgc: 13- TKBG HOA HQC 12 NCT2 193 Hogt dpng cua GV Bai L Cation kim loai M " cd ciu Hogt dpng cda HS Bai Chgn dap an A hinh electron eiia phan ldp ngoai ciing la 3d" Vay cau hinh electron eiia M la A ls-2s-2p^3s^3p^3d^ B ls-2s-2p^3s-3p^ C ls-2sV3sV3dV D ls^2s^2p^3s^3p''3d^4s' Bai Cho phan ung boa hgc sau Zn + Cr 3+ Bai Chgn dap an C > Cr^" + Zn^" Cau nao bieu dien dung vai trd eiia eac chat tham gia A Zn la chat oxi hoa, Cr la chat khir B Zn" la chat khir, Cr " la chit oxi boa C Cr la chat oxi hoa, Zn la chit khir D Cr" la chat khir, Zn la chat oxi hoa Bai Cho 13,5 gam hon hgp eac kim Bai Chgn dap an C loai Al, Cr, Fe tac dung vdi lugng du dung dich H2SO4 bang ndng (trong dilu kien khdng ed khdng khi), thu dugc dung dich X va 7,84 lit H2 (d dktc) Cd can dung dich X (trong dilu kien khdng cd khdng khi) dugc m gam muoi khan Gia tri cua m la A 48,8 B 42,6 C.47.1 D.45,5 Bai tap ve nha: 1, 2, 4, (SGK) 194 D HU'ONG DAN GIAI BAI TAP TRONG SGK a) Vi tri ciia crom bang he thdng tuin hoan: thudc chu ki 4, nhdm VI B b) c i u hinh electron nguyen tir: ls^2s^2p^3s^3p^3d^4s' c) Kha nang tao cae trang thai oxi boa khac cua crom: Do cd nhieu electron ddc than d cae obitan 3d va 4s nen cac hgp chit crom ed sd oxi hoa biln ddi tir +1 din +6, Trong dd phd biln nhit la eac sd oxi boa +2, +3, +6 So sanh tinh chat boa hgc ciia nhdm va crom: a) Gidng nhau: - Phan ling vdi phi kim - Phan ling vdi axit HC1,H2S04 loang - Ben khdng va khdng phan iing vdi nude - Bi thu ddng hoa axit H2SO4 va HNO3 dac, ngudi Khdc nhau: - Nhdm ehi ed trang thai oxi boa la +3 cdn crom cd nhilu trang thai oxi hoa: phan ung vdi axit, nhdm cho hgp chit nhdm(III) cdn crom eho hgp chat erom(II) - Nhdm cd tinh khir manh ban nen nhdm khii dugc crom (III) oxit a) Chgn B: He sd eiia crom phan ii-ng la b) Chgn C: Suat dien ddng chuin cua pin dien hoa la 0,60V ' Phuong trinh hoa hgc cua phan img nhiet nhdm Cr203 + 2AI -^ 2Cr + AI2O3 < ' 78 Lugng crom can dieu cbl: — = 1,5 (mol) ^ 52 Theo phuong trinh hoa hgc, lugng nhdm cin dimg la: 1,5 mol Vay khdi lugng nhdm cin diing la: 1,5.27 = 40,5 (gam) 20 Lugng crom 100 g hgp kim la: — = 0,385 (mol) 80 Lugng niken 100 g hgp kim la: — = 1,356 (mol) Vay lugng niken ung vdi mol crom hgp kim la: - i ^ ^ = 3,522 (mol) 0,385 195 Bai 39 MOT SO HOP CHAT CUA CROM A MUC TIEU BAI HOC Ki§n thu'c HS biit: • Tinh chat hoa hgc dac trung ciia cac hgp chat crom(II), crom(III), crom (VI) • Ung dung ciia mdt sd hgp chat ciia crom HS hieu: Nguyen nhan gay tinh oxi hoa manh cua hgp chat crom (VI) KT nang • Viet phuong trinh hoa bieu dien tinh chat hoa hgc cua crom va hgp chat crom • Giai bai tap ve hgp chat ciia crom B C H U A N B! C U A GV VA HS • GV: - Bang tuan hoan eac nguyen td hoa hgc - Hoa chat: Zn, tinh the K2Cr207, dung dich CrCl3, dung dich HCl, dung dich NaOH, tinh thi (NH4)2Cr207 - Dung eu: Chen sir, dng nghiem, gia thi nghiem, den cdn • HS; Xem trudc ndi dung bai hgc C T|£N TRiNH DAY - HOC Hogt dpng ciia GV Hogt dpng cua HS Hogt dpng I HOP CHAT CUA CROM Crom(II) oxit, CrO GV gidi thieu: Hgp chat Cr(ll) ed sd HS nghe GV gidi thieu oxi hoa +2 nen ed tinh khir, de bi oxi hoa len sd oxi hoa +3 GV cho HS nghien ciru SGK va yeu cau HS neu tinh chat hoa hgc ciia CrO 196 HS nghien ciru SGK thao luan va nhan xet - Crom (11) oxit la oxit baza, ed tinh khu Hogt dpng cua GV Hogt dpng ciia HS CrO +2HC1 -> CrCl2 + H2O 4CrO +O2 - ^ 2Cr203 Crom(II) hidroxit, Cr(OH)2 GV cho HS nghien ciru SGK yeu eau HS neu: ^ HS nghien ciru SGK va nhan xet - Tinh chat vat li eiia Cr(0H)2 - Crom (II) hidroxit nguyen chat la chat ran, mau vang, khdng tan nude - Tinh chat hoa hgc cua Cr(0H)2 - Cr(0H)2 cd tinh khir de bi oxi khdng oxi hoa theo phan img, de phan huy bdi nhiet 4Cr(OH)2 + O2 + 2H2O Cr(0H)2 > 4Cr(OH)3 * °""t''''"' > CrO + H2O - Cr(0H)2 la oxit baza nen Cr(0H)2 + HCl -> CrCb + 2H2O - Phuang Cr(0H)2 phap dieu che cua - Dieu che Cr(0H)2 bang each eho mudi Crom (II) tac dung vdi dung dich kiem Cr 2+ 20H -^ Cr(0H)2 Muoi crom(II) GV yeu cau HS du doan tinh chat HS thao luan cho ket qua ciia hgp chat mudi erom(ll) - Mudi erom(Il) cd tinh khir manh 2CrCl2 +CI2 ^ C r C l - Mudi crom(ll) cd tinh chat chung ciia mudi CrCl2 + 2NaOH -^ Cr(0H)2^ +2NaCl CrS04 + BaCl2 -4- CrC^ + BaS04 i GV yeu ciu HS neu kit luan vl tinh - Ket luan: Hop chdi crom(n) cd linh khic chit chung ciia hgp chat crom(ll) manh 197 Hogt dpng cda HS Hogt dpng cda GV Hogt dpng II HOP CHAT CROM(III) Crom(III) oxit, CYIOJ, GV cho HS nghien ciiu SGK va yeu eau HS neu - Neu tinh chat vat li ciia Cr203 HS nghien cim SGK thao luan va nhan xet - Crom (III) oxit la chat ran mau luc tham, khdng tan nude - Cac phan img chiing minh Cr203 ludng - Viet eac phan img chimg minh tinh Cr203 + 6HC1 Cr203 la hgp chat luang tinh Cr203 > 2CrCl3 + 3H2O +2NaOHdac + 3H2O > 2Na[Cr(OH)4] Crom(III) hidroxit, Cr(OH)3 HS vilt phuang trinh boa hgc GV gidi thieu: - Cr(0H)3 la chat ran ma luc xam, khdng tan nude - Cr(0H)3 cd tinh chat tuong tu - Phan ling phan buy A1(0H)3 yeu cau HS viet cac phan Cr(0H)3 ^ img minh hoa eho tinh chat eiia - Tac dung Cr(0H)3 va phan img dieu che Cr(0H)3 + Cr(0H)3 - Tac dung ^ Cr203 + H2O vdi axit 3HCI - -> CrCl3 + 3H2O vdi kiem Cr(0H)3.+ NaOH >Na[Cr(0H)4] - Dieu che CrCl3 + N a O H ^ ^ Cr(0H)3 + 3NaCl Muoi crom (III) GV lam thi nghiem: cho mdt it bdt Zn va dung dich CrC^ lac kT Sau 198 HS quan sat thi nghiem va nhan xet Hogt dpng cua GV Hogt dpng cua HS mdt thdi gian cho HS quan sat yeu eiuHS - Hien tugng: Thay bdt kem tan dan - Neu hien tugng dung dich CrC^ - Giai thich - Viet phuong trinh boa bgc dang - Giai thich: Do Zn da phan iing vdi dung dich mudi CrC^ theo phan iing phan tir va dang ion Zn + CrCl3 GV luu y HS: Tuy Zn dimg trudc Cr day boat ddng hoa hgc nhung 3+ Zn + Cr^" > CrCb + ZnCb > Cr^" + Zn^" 2+ Zn chi khir dugc Cr Cr GV gidi thieu: Mudi NaCr02 bi HS viet phuang trinh boa hgc: brom oxi hoa mdi trudng kiem tao mudi Na2Cr04 yeu eau HS viet phuong trinh hoa hgc 2NaCr02 + 3Br2 + 8NaOH > 2Na2Cr04 +NaBr + 4H2O Cr02" +3Br2 +0H" ->Cr04^" +6Br" +H2O Hogt dpng III HOP C H A T CROM(VI) Crom(VI) oxit, CrOj GV cho HS nghien ciiu SGK va yeu cau HS neu HS nghien eiiu SGK va nhan xet - Tinh chat vat li ciia Cr03 - Cr03 la chit ran mau dd tham - Tinh chit hoa hgc ciia Cr03, viet - Cr03 la oxit axh H2O + Cr03 phuang trinh hoa hgc minh hoa GV bo sung: Cac axit cua crom ehi tdn tai dung dich, khdng tach dugc d trang thai tir > H2Cr04 Axit cromic H2O + 2Cr03 — > H2Cr207 Axit dieromic 199 4.15 Tien hanh phan iing trimg hgp 5,2 gam stiren, sau phan iing ta them 400 ml dung dich nude brom 0,125M, khuiy diu cho phan ting hoan toan thay du • 0,04 mol Br2 Khdi lugng polime sinh la A 4,16 gam B 5,20 gam C 1,02 gam D 2,08 gam Ddp dn A Hogt dpng DAI Cl/ONG VE KIM LOAI 5.1 Nhiing mdt la Fe nhd vao dung dich (du) chiia mdt nhiing chit sau: FeCl3, AICI3, CUSO4, Pb(N03)2, NaCl, HNO3, H2SO4 (dac, ndng), NH4NO3 Sd trudng hgp phan img chi tao mudi Fe(II) la: A B.4 C.5 D.6 Ddp dn A 5.2 Dung dich X chira loai ion Mg , Ba ^, Ca ^ va 0,2 mol CF va 0,2mol 5.3 5.4 5.5 5.6 NO3 Them dan V lit dung dich K2CO3 IM vao dung dich X den dugc lugng ket tua ldn nhat, V cd gia tri la: A 150ml B 200ml C 250ml D 300ml Ddp dn B Magie cd the chay CO2, tao mdt chat bdt mau den Cdng thiic hoa hgc cua chat la: D.MgCOs A C B MgO C CO Ddp dn A Hoa tan hoan toan 7,8g hon hgp gdm Mg va Al vao dung dich HCl du Sau phan ling thiy khoi lugng dung dich tang len 7,0g.Sd mol axit HCl da tham gia phan iing tren la: A 0,8mol B 0,08mol C 0,04mol D 0,4mol Ddp dn A Cho Al tir tir din du vao dung dich hon hgp Cu(N03)2, AgN03, Mg(N03)2, Fe(N03)3 thi thii tu cae ion bi khir la: A Fe'"*-, Ag^ Cn^\ Ug* B Ag^ Cu'^ F e ' ^ Mg'^ C Ag^ V^, Cv^\ Fe^" D Ag^ Fe^\ Cu^^ Mg^" Ddp dn D Hoa tan 20g hon hgp gdm hai kim loai Fe va Cu vao dung dich HCl du Sau phan ling, cd can dung dich dugc 27,Ig chat ran The tich chat thoat d dktc la: A 8,961it B 4,481it C 2,24lit D l,12lit Ddp dn C 351 5.7 Hoa tan hoan toan 20g hdn hgp Mg va Fe vao dung dich axit HCl du thay cd 11,21it thoat d dktc va dung dich X Cd can dung djch X thi thu dugc bao nhieu gam mudi khan? A 35,5g B.45,5g C 55,5g D 65,5g Ddp dn C 5.8 Hoa tan hoan toan 4,68g hon hgp mudi cacbonat cua hai kim loai X va Y kl tilp nhdm IIA vao dung dich HCl thu dugc l,12lit CO2 d dktc Kim loai X va Y la: A Be va Mg B Mg va Ca C Ca va Sr D Sr va Ba Ddp dn B 5.9 Hoa tan hoan toan 28,3g bdn hoan gdm mdt mudi cacbonat ciia mdt kim loai boa tri I va mdt mudi cacbonat kim loai hoa tri II axit HCl du thi tao 4,481it (dktc) va dung dich X Cd can dung dich X thi thu dugc bao nhieu gam muoi khan? A.26,lg B.28,6g C 29,4 g D 30,5g Ddp dn D 5.10 Kem tac dung vdi dung dich H2SO4 loang, them vao dd vai gigt dung dich CUSO4 Lira chgn hien tirgng ban chit cac hien tugng sau: A An mdn kim loai B An mdn dien boa hgc C Hidro thoat manh ban D Mau xanh biln mit Ddp dn C 5.11 Cho 21,6g mdt kim loai chua bilt hoa tri tac dung hit vdi dung dich HNO3 thu dugc 6,72 lit N2O (dktc) Kim loai dd la: A.Na B Zn C Mg D Al Ddp dn D , 5.12 CO va H2 khong thi dung lam chit khir dl dilu cbl kim loai nao sau day: CAI D Sn A Fe B Cu Ddp dn C 5.13 Hoa tan hit 38,60g hon hgp gdm Fe va kim loai M dung dich HCl du thiy thoat 14,56lit H2(dktc) Khdi lugng hdn hgp mudi clorua khan thu dugc la: A.48,75g B.84,75g C 74,85g D 78,45g Ddp dn B 5.14 Trdn 2,7g Al vdi 2,4g Fe203 rdi nung ndng dl thuc hien phan iing nhiet nhdm Sau phan img ta thu dugc m(g) hon hgp chit rin Gia tri ciia m la: A.l,12g B.2,04g C.5,lg D io,2g Ddp dn C 352 5.15 Co thi dung dung dich nao sau day dl tach Ag khdi hdn hgp chat ran gom: Fe, Pb, Cu, Ag ma khdng lam thay doi khdi lugng Ag? A HCl B.NaOH C AgN03 D Fe(N03)3 Ddp dn D Hogt dpng KIM LOAI KIEM, KIM LOAI KIEM THO, NHOM 6.1 Tinh khir ciia cac nguyen tir Na, K, Al, Mg dugc xIp theo thir tu tang din la A K, Na, Mg, Al B Al, Mg, Na, K C Mg, Al, Na, K D Al, Mg, K, Na Ddp dn B 6.2 Khi dl khdng nhdm khd bi an mdn hon sit la A nhdm cd tinh khir manh ban sit B tren be mat nhdm cd ldp AI2O3 bin vung bao ve C nhdm cd tinh khir yeu hon sat D.tren be mat nhdm cd Igp A1(0H)3 bao ve Ddp dn B 6.3 Khi nung hdn hgp gdm Al, CuO, MgO, FeO (lugng vira du), sau cac phan ling xay hoan toan ta thu dugc chat ran A gdm cac chat sau: A Cu, AI2O3, Mg, Fe B Cu, FeO, Mg, AI2O3 C Cu, Fe, Al, MgO, AI2O3 D Cu, Fe, AI2O3, MgO Ddp dn D 6.4 Trong vd nguyen tu cua cac nguyen td: Al, Na, Mg, Fe (d trang thai ca ban) cd sd electron ddc than lan lugt la A 1,1,0,4 B.3, 1,2, • C 1,1,2, D 3, 1,2, Ddp dn A 6.5 Cho 13,7 gam kim loai Ba vao 200 ml dung dich FeS04 IM, sau cae phan umg xay hoan toan ta thu dugc ket tiia cd khdi lugng la B 14,4 gam C 31,3 gam D 23,3 gam A 28,9 gam Ddp dn C 6.6 Cho cac chit: MgO, CaC03, AI2O3, dung dich HCl, NaOH, CUSO4, NaHC03 Khi cho cac chit tren tac dung vdi timg ddi mdt thi tdng sd cap chat phan iing dugc vdi la A B C D Ddp dnC 353 6.7 De tinh che quang boxit (AI2O3 ed lan Si02 va Fe203) ngudi ta cho quang (dang bdt) lan lugt tac dung vdi eac chit: A.NaOH, CO2 Ddp dn A B HC1,C02 C NaOH, CuCb D.HCl vaNH3 6.8 Cho m gam NaOH tac dung vdi mdt lugng vira dii dung dich HNO3, dugc dung dich A Cd can A dugc chit rin B, nung B din khoi lugng khdng doi thay cd 2,24 lit (dktc) thoat Gia tri ciia m la: A 4,96 gam B gam C 3,2 gam D 12 gam Ddp dn B 6.9 Theo thuylt axit-baza ciia Bronstet hidroxit luang tinh la B.NH4HCO3 C.A1(0H)3 D Ba(0H)2 A.NaHC03 Ddp dn C 6.10 Khi dien phan dung dich NaCl thi d eatdt xay qua trinh: A khirNa^ Ddp dn B B khir H2O C oxi hoa Cf D kbirCf 6.11 Khi cho kim loai Mg vao dung dich chiia dong thdi cac mudi: Cu(N03)2, AgN03, Fe(N03)2, khuiy diu dl cac phan iing xay hoan toan, ta thu dugc chit ran B gdm kim loai hai kim loai dd la A Cu,Fe B Fe,Ag C Ag, Mg D Cu, Ag Ddp dn D 6.12 Cho sa dd biln boa: X + H2O "P"" ) A + Bt + CT B+ A - ^ ^ X + Y + H2O B+ C ^ ^ -D Ddt chay hgp chat X tren nggn lira den thiy ngon liia cd mau vang Cac chit A, B, C, D, X, Y lin lugt la: A NaCl, NaOH, Cl2,H2, NaClO, HCl B NaOH, CI2, H2,HCl, NaCl, NaCl03 C NaOH, CI2, H2,HCl, NaCl, NaCl02 D NaOH, CI2, H2, HCl, NaClOj, NaCl Ddp dn D 6.13 Cho mau Na vao dung dich cac chat (rieng biet) sau: Ca(HC03)2(l), CuS04(2), KNO3 (3), HC1(4) Sau cac phan iing xay xong, ta thiy cac dung dich cd xuit hien kit tiia la A.(l)va(2) B ( l ) v a ( ) C (l)va(4) D (2) va (3) Ddp dn A 354 6.14 Vat lieu thudng dugc dimg dl diic tugng, san xuit phin vilt bang, bd bdt bi gay xuong la A CaC03 Ddp dn C B CaO C CaS04 D MgS04 6.15 Cho 4,48 lit CO2 vao 150 ml dung dich Ca(0H)2 IM, cd can hdn hgp cac chat sau phan iing ta thu dugc chit rin cd khoi lugng la A 18,1 gam B 15 gam C 8,4 gam D 20 gam Ddp dn B Hogt dpng S A T V A M O T S O K I M L O A I Q U A N TRONG 7.1 Cation kim loai M cd ciu hinh electron ciia phan ldp ngoai cimg la 3d^ Vay cau hinh electron eiia M la: A ls^2sV3s^3p^3d^4sl B ls^2s^2p^3s^3p^3d^ C ls^2s^2p^3s^3pW3d^ Ddp dn A D ls^2s^2p^3s^3p^3d^4s^4p' 1.1 Cho Fe tac dung vdi dung dich AgN03 du thi sau phan iing thu dugc: A Fe(N03)3, Ag B Fe(N03)2, Ag C Fe(N03)2, Fe(N03)3, Ag D Fe(N03)2, Fe(N03)3, Fe Ddp dn A 7.3 Cho 11,2 gam Fe va 2,4 gam Mg tac dung bet vdi dung dich H2SO4 loang du thu dugc V lit H2 (dktc) va dung dich X Cho X tac dung vdi dung dich NaOH du thu dugc ket tua, lgc tach ket tua va nung den khdi lugng khdng ddi thu dugc m gam chat ran Gia tri eiia V la: A 2,24 lit B 4,48 lit C 6,72 lit D 8,96 lit Ddp dn C 7.4 Ddt ndng mdt it bdt Fe binh dimg O2 sau dd cho san pham thu dugc vao dung dich HCl du thu dugc dung dich X Dung dich X cd: B FeCb, HCl du A FeCl2, HCl du D FeCb C FeCl2, FeCb va HCl du Ddp dn C 7.5 Cho sa dd chuyen hoa Fe(0H)3 Fe "'' > Fe2(S04)3 —^ -^FeCb X, Y, Z la: B H2SO4 dac ndng, MgCb, NaOH A CUSO4, BaCb, NaOH C H2SO4 dac ndng, BaCb, NH3 D H2SO4 loang, BaCb, NaOH Ddp dn C 355 7.6 Dung dich FeS04 lam mit mau dung dich nao cac dung dich sau: B Dung dich K2Cr207/H2S04 A Dung dich KMn04/H2S04 C Dung dich Br2 D Ca ba dung dich tren Ddp dn D 1.1 Cho dung dich chira FeCb va ZnCb tac dung vdi dung dich NaOH du, sau lay ket tiia nung khdng din khdi lugng khdng ddi thu dugc chit ran gdm: A.Fe203 B.FeO C FeO, ZnO D Fe203, ZnO Ddp dn A 7.8 Hoa tan het 17,84 gam hon hgp A gdm ba kim loai la sit, bac va ddng bing 203,4 ml dung dich HNO3 20% (cd khdi lugng rieng 1,115 gam/ml) vira du Cd 4,032 lit NO nhit thoat (dktc) va cdn lai dung dich B Dem cd can dung dich B, thu dugc m gam hon hgp ba mudi khan Tri sd cua m la: A 60,27gam B 45,64gam C 51,32 gam D 54,28 gam Ddp dn C 7.9 Gang xam khac gang tring d tinh chit: A Gang xam gidn khdng diic dugc cdn gang tring diic dugc B Gang xam dung dl diic chi tilt may cdn gang tring khdng diic dugc C Gang xam rit ciing cdn gang tring thi mim ban D Gang xam cd it cacbon hon gang tring Ddp dn B 7.10 Hoa tan hoan toan gam hon hgp gdm Al, Zn, Fe vao dung dich HNO3 du thu dugc 0,224 lit NO (dktc) nhit Cd can dung dich thi khdi luang mudi khan thu dugc la: A 3,68 g B.3,86g C 6,83 g D 3,56 g Ddp dn B 7.11 Nung mdt mau thep thudng cd khdi lugng 50g oxi du thi thu dugc 0,196 lit CO2 d C va at Thanh phin phin tram ciia C mau thep la: A 0,48% B.0,38% C 0,84% D 3,08% Ddp dn C 7.12 Khir hoan toan mgt oxit sit nguyen chit bing CO du d nhiet cao Kit thuc phan iing, khdi lugng chit rin giam di 27,58 % Oxit sit da dimg la: A.Fe203 B.Fe304 C Fe(N03)3 D FeO , Ddp dn B 7.13 Hoa tan 16,8g Fe vao dung dich HNO3 thu dugc 4,48 lit NO nhit Cd can dung dich thu dugc sd gam mudi khan laA.48,4g B.72,6g C 54,0g D 36,0g Ddp an C 356 7.14 Mau nau cua dung dich Fe(N03)3 la do: A Mau ciia Fe(0H)3 B Mau cua ion NO3 C Mau cua ion Fe D Mau ciia ion Fe Ddp dn C 7.15 Nguyen lieu dimg dl san xuit gang la: A Quang sat, oxi nguyen chat, than da B Quang sat, than cdc, chat chay, khdng C Quang sat, chat chay, than da D Quang sat, khdng khi, than da Ddp dn B Hogt dpng NHAN BIET M O T S C H A T V CO 8.1 Chi dung dung dich hoa chat thich hgp, cd the phan biet kim loai rieng biet: Na, Ba, Cu Dung dich la: A HNO3 B.NaOH C H2SO4 D.HCl Ddp dn C 8.2 D I phan biet cae dung dich rieng biet: dung dich NaCl, nude Javen, dung dich KI ta cd the dimg mdt thudc thir, dd la A Dung dich HCl B Dung dich AgNOs C Dung dich KMn04 D Dung dich NaOH Ddp dn B 8.3 Cd bdn kim loai: Mg, Ba, Zn, Fe Chi diing them mgt chit thi cd thi dimg chit nao sd cdc chit cho dudi day dl nhan biet cac kim loai dd? A Dung djch NaOH B Dung djch Ca(0H)2 C Dung dich HCl D Dung dich H2SO4 loSng Ddp dn D 8.4 Chi dimg them dung dich H2SO4 loang, cd thi nhan biet dugc bao nhieu kim loai sd cac kim loai sau:Al, Mg, Fe, Cu, Ba A B.2 C.3 D.5 Ddp dn D 8.5 Chi dimg mdt dung dich axit va dung dich baza nao sau day de nhan bilt cac hgp kim Cu - Ag, Cu - Al, Cu - Zn A HCl va NaOH B H2SO4 C NH3 va HNO3 loang D NH3 va HCl Ddp dn D 357 8.6 Cd Ig dung dung dich mit nhan la AICI3, NaN03, K2CO3, NH4NO3 NIU ehi dugc phep diing mdt chit lam thudc thir thi ed thi chgn chat nao sau day? A Dung djch NaOH B Dung dich Ba(0H)2 C Dung dich H2SO4 Ddp dn B D Dung dich AgNOs 8.7 De phan biet muoi FeS04 va Fe2(S04)3 cd the diing thudc thir nao sau day? A Dung djch BaCb B Dung dich NaOH C Dung dich KMn04/ H2SO4 D Ca B va C Ddp dn D 8.8 Thuoc thir nao cd thi phan biet dung dich mat nhan: Na2S04, H2SO4, NaOH, BaCb? A Quy tim B Phenolphtalein C Dung dich AgN03 Ddp dn D D A hoac B 8.9 Dl nhan bilt day dung dich: HCl, NaOH, Na2S04, NH4CI, NaCl, BaCb, AgN03 thi can dung it nhat bao nhieu loai thudc thii: A.l B.2 C.3 D.4 Ddp dn A 8.10 De nhan biet bdt kim loai Fe, Ag, Cu dung eac binh rieng biet dimg thudc thir: A Dung dich HNO3 dac ndng B Dung dich HCl C Dung dich H2SO4 loang Ddp dn A D Dung dich NaOH 8.11 D I phan biet cac dung djch (rieng biet): CrCb, CuCb, NH4CI, CrCb va (NH4)2S04 ta ehi can dimg mdt dung dich thudc thir la A dung dich NaOH B Ba(0H)2 C BaCb D AgN03 Ddp dn B 8.12 Chi diing NaOH ed the nhan biet dugc day hoa chat nao cac day sau day: 358 A Na2C03, AgN03, CaCb, HCl B H2SO4, Na2S04, MgS04, AlCb C CuCb, AICI3, CaCb, NaCl Ddp dn B D AICI3, Zn(N03)2, FeCb, MgS04 8.13 Chi dimg quy tim nhan biet cac chit rieng biet day dung dich sau: A Na2C03, K2SO3, CaCb, HCl B Na2C03, NaOH, HCl, Ba(0H)2 C Al(N03)3, FeS04, CuCb, NH4CI, HCl D H3PO4, H2SO4, HCl, H2O Ddp dn B 8.14 Dl nhan bilt day dung dich: HCl, NaOH, Na2S04, NH4CI, NaCl, BaCb, AgN03 thi cin dung it nhit bao nhieu loai thuoc thir: D, A B C Ddp dn A 8.15 De nhan bilt day boa chit sau (d dang dung dich) KOH, HCl, FeCb, Pb(N03)2, Al(N03)3, NH4NO3 thi phai diing it nhit sd thudc thu la: A B.2 C D khdng can thudc thir Ddp dn D Hogt dpng HOA HOC v A V A N DE P H A T TRIEN KINH TE, XA HOI, MOI T R L T O N G 9.1 Ngudi ta sir dung clo de diet khuan nude vi li nao sau day? A Clo ddc nen cd tinh sat triing B Clo cd tinh oxi hoa manh C Trong nude clo cd mat HCIO la chat oxi boa manh D Trong nude clo cd mat HCl la chat khir manh Ddp dn C 9.2 Ta tien hanh cac thi nghiem: Mn02 tac dung vdi dung dich HCl (1) Nhiet phan KCIO3 Nung hon hgp: CH3COONa + NaOH/CaO (2) (3) Nhiet phan NaN03 ^ (4) Cac thi nghiem tao san phim gay d nhiem mdi trudng la A.(l)va(2)' B.(l)va(4) C.(l)va(3) D (2) va (3) Ddp dn C 9.3 Hieu iing nha kinh la hien tugng Trai dat dang ndng len, cac biic xa ed budc sdng dai vimg bdng ngoai bi giir lai, ma khdng biic xa ngoai vii tru Chit nao sau day la nguyen nhan gay hieu irng nha kinh? 359 A S02 B N2 C CO2 D SO3 Ddp dn C 9.4 Khi lam thi nghiem vdi P trang can phai: A Cam bang tay cd deo gang B Diing cap gap nhanh mau P khdi Ig va cho vao chau dung day H2O chua sir dung C Tranh cho tiep xiic vdi H2O D De ngoai khdng Ddp dn B 9.5 Mdt loai nude cimg chiia 180 ppm (phan trieu) HCO3 Can dimg bao nhieu kg CaO de lam mem x lit nude, gia sir chi cd nude ciing tam thdi A ~150kg B 165kg C ~ 660kg D 330kg Ddp dn D 9.6 Phan img tdng hgp glucoza cay xanh can dugc cung cap nang lugng ^"""'^^ ) C6H12O6 + 6O2 Cho bilt cii mdt phiit (trdi ning) 6CO2 + 6H2O mdi cm la xanh nhan dugc 0,5cal nang lugng mat trdi nhung chi cd 10% dugc sir dung vao phan iing tdng hgp glucoza Hdi cay xanh cd 10 la, mdi - la 10cm thi can thdi gian la bao nhieu de tdng hgp dugc 0,18 gam glucoza va giai phdng dugc bao nhieu lit O2 (dktc)? A 221 phut va 0,1344/02 B 134 phut va 0,1344/02 C 92 phut va 0,244/02 Ddp dn B D 92 phut va 0,1344/02 2+ 2+ 3+ 2+ 9.7 Mdt loai nude thai bi d nhiem bdi cac kim loai nang Pb , Cu , Fe , Mn Hay chgn chat tdt nhat de loai bd het kim loai nang A NaOH du B Nude vdi (dung dich Ca(0H)2) D H2SO4 C Sue H2S Ddp dn B 9.8 Khi thai (cua mdt nha may) cd chiia cac chat HF, CO2, SO2, NO2, N2 Hay chgn chat tdt nhat de loai bd cac ddc trudc thai quyen B Si02 va H2O A CaC03 va H2O C Nude vdi (dung djch Ca(0H)2) D CaCb Ddp dn C 9.9 Khi CO2 thai nhieu dugc coi la anh hudng xiu din mdi trudng vi: A Rat ddc B Tao bui cho mdi trudng C Gay hien tugng mua axit D Gay hieu iing nha kinh Ddp dn D 360 9.10 Brdm long hay hai deu rit ddc D I xir li lugng brdm ldng khdng may bi vdi muc dich bao ve mdi trudng, cd thi diing boa chit thdng thudng de kiem nao sau day? A Dung dich NaOH B Dung dich KOH C Dung dich Ca(0H)2 D Dung dich Nai Ddp dn C 9.11 D I diet chudt mdt nha kho ta ddt luu huynh roi ddng kin cira nha kho laj Chudt hit phai khdi se bi sung yit hiu, eo giat, te liet, ca quan hd hip dan din bi ngat ma chit Chit gi da lam chudt chit? A.H2S B H2SO4 C SO2 D SO3 Ddp dn C 9.12 Am dun nude lau thudng cd mdt ldp can vdi dudi day D I lam sach can cd the theo each nao sau day? A Dung giam pha vao nude am ngam vai tieng rdi siic sach B Diing rugu pha vao nude am ngam vai tieng rdi sue sach C Dimg dung dich amoniac pha vao nude am ngam vai tieng rdi siic sach D Ca A, B, C deu dugc Ddp dn A 9.13 Ung dung nao sau day khong phai ciia xenluloza? -A Dung la vat lieu xay dung va dd gd B Nguyen lieu san xuat ximang C Nguyen lieu san xuat giay,vai sgi, ta sgi nhan tao D Nguyen lieu san xuat rugu etylic Ddp dn B 9.14 Nhung chat cho dudi day, chat nao la ngudn nguyen lieu tu nhien: canxi cacbua, cat, khoang vat pirit, nude bien va dai duong, rugu etylic, axit sunfuric, ta nilon - 6,6, khdng khi? A Cat, pirit, nude biln, axit sunfuric, khdng B Canxi cacbua, cat, pirit, nude bien, ta nilon, khdng C Cat, pirit, nude bien, khdng D Cat, pirit, rugu etylic, nude bien, khdng Ddp dn C 361 MUC LUC Chu'O'ng DAI CU-ONG V^ KIM LOAI Bd 19 KIM LOAI VA Hgp KIM Bd 20 DAY DIEN HOA CUA KIM LOAI Ba 21 LUYEN TAP TiNH C H A T C O A KIM LOAI Ba 22 SU'DIEN P H A N Bd 23 SU A N M O N K I M LOAI Bd 24 Ditu cne KIM LOAI Bd 25 LUYEN TAP SU" DIEN PHAN - Sl/ A N M O N KIM LOAI OlSU C H E KIM LOAI Bd 26 BAI THU'C H A N H D A Y O I E N H O A C U A K I M LOAI - O I ^ U C H ^ KIM LOAI B^ 27 BAI THU'C H A N H A N M N K I M LOAI - C H C N G A N M O N KIM LOAI 23 42 50 67 75 83 90 95 Chu'O'ng KIM LOAI KI^M, KIM LOAI KI^M T H O , NHOM Ba 28 KIM LOAI KltM B^ 29 MOT SO HC^P C H A T Q U A N TRONG C G A KIM LOAI KltM B^ 30 KIM LOAI KIEM T H O Bd 31 MOT SO HOP C H A T Q U A N TRONG C O A KIM LOAI K I E M T H O Ba 32 LUYEN TAP TlNH C H A T C O A KIM LOAI K | £ M KIM LOAI KltM T H O Ba 33 N H O M BS 34 MOT SO HOP C H A T Q U A N TRONG C O A N H O M BS 35 LUYEN TAP TlNH C H A T C O A N H O M V A HOP C H A T C O A N H O M BS 36 BAI THl/C H A N H TlNH C H A T CUA KIM LOAI KltM, KIM LOAI HOP C H A T CUA CHUNG THLTC H A N H T I N H C H A T CUA N H O M KIEM T H O V A Ba 37 BAI VA H ^ P CHAT COA NHOM 100 111 119 126 143 150 162 170 179 184 Chu'O'ng CROM - S A T - O O N G 6^138 CROM 190 Bai 39 MOT SO HOP C H A T COA CROM 196 BSi40 S A T 203 Bai 41 MOT SO HOP C H A T CUA S A T 213 Bai 42 HOP KIM CUA S A T BSi 43 O O N G V A MOT SO HOP C H A T C U A O O N G Bd\ 44 SO LU'OC V t MOT SO KIM LOAI KHAC Bai 45 LUYEN TAP TlNH C H A T CUA CROM, S A T 362 220 VA N Q P CHAT COA 229 241 CHUNG 251 Bai 46 LUYEN TAP T I N H C H A T H O A HOC C O A O O N G V A HOP C H A T CUA D O N G SO LU'OC v e CAC KIM LOAI Ag, Au, Ni, Zn, Sn, Pb B^i 47 BAI THl/C H A N H TlNH C H A T H O A HOC CUA CROM, SAT, O O N G N H L / N G H O P C H A T C U A CHUNG 270 265 VA Chu'O'ng PHAN BIET MOT S C H A T V CQ C H U A N DO DUNG DjCH B^i 48 NHAN B I E T MQT SO CATION TRONG DUNG DjCH Bai 49 NHAN B I E T M O T S O ANION TRONG DUNG DjCH 277 284 BSi 50 NHAN BIST MQT SO C H A T K H I 290 BSi51 B^i 52 B^i53 B^i 54 B^i 55 296 301 304 310 317 CHUAN CHUAN DO AXIT - BAZO D O X H O A - KHIJ B A N G PHU'ONG PHAP PEMANGANAT LUYENTARNHANBI^TMOTSOCHATVOCO BAI BAI THl/C THl/C HANH HANH NHAN BlfT MOT SO ION VO CO C H U A N O O DUNG DjCH Chu'O'ng HOA HOC vA V A N Dt P H A T T R I ^ N KINH T^, XA HOI, MOI TRI/ONG Bd\ 56 HOA HOC VA V A N D t P H A T T R I ^ N KINH T E 322 BSi57, HOA HOC VA VAN D t XA HOI 328 B^i 58 HOA HOC VA VAN D f M O I TRLCONG ON T A P C U O I N A M 334 341 363 Thiet ke bai giang HOA HQC 12 - NANG CAO: TAP HAI TS CAO CU GlAC (ChQ bien) N H A XUAT BAN H A NOI Chiu trdch nhiem xuc^ bdn: NGUYfiN K H A C O A N H Bien tap: PHAM Q u d c TUAN Vebia: NGUYfiN TUAN Trinh bdy: THAI SON - SON LAM sua bdn in: PHAM QU6C TUAN In 1000 cuon, kho 17 x 24 cm, tai Cong ty Co phan In Phiic Yen Giay phep xuat ban so: 68 - 2009/CXB/67g TK - 06/HN In xong va nop iLfu chieu nam 2010 Sach lien ket voi Cong ty co phan In va Phat hanh sach Viet Nam li^N INPHAVI Phat hanh tai Cong ty cd phan In va Phat hanh sach Viet Nam Dia chi : 78 • Dong Cac • Dong Da - Ha Noi OT: (04) 5.1 15921 - Fax : )04)5.1 15921 Tluf(kfBGH(5ahocl2T2NC ill vec Mo.ig 'ilill 20^^2825 43.000 D Gid: 43.000d [...]... a) K2Cr207 + 3H2S + 4H2SO4 - Cr2(S04)3 + K2SO4 + 7H2O + 3S b) K2Cr207+14HCl ^ 2CrCb - 3Cl2 + 2KCI + 7H2O c) K2Cr207 + 6FeS04 + 7H2SO4 > Cr2(S04)3 + K2SO4 + 7H2O + 3Fe2(S04) Trong eac phan img tren, K2Cr207 la chit oxi hoa, cdn H2S, HCl, FeS04 la chit khir, H2SO4, HCl la mdi trudng 20 2 Phan ling tren la phan iing oxi boa - khir ndi phan tir Phuong trinh hoa hgc: (NH4 )2 Cr207 -> N2 + Cr203 + 4H2O Phuong... khir (Budc 1 viet cac chat san pham, budc 2 thanh mudi Cr (111) Yeu cau HS can bang oxi hoa khir) hoan thanh cae sa dd phan img sau K2Cr207 + FeS04 + H2SO4 > K2Cr207 + 6FeS04 +7H2SO4 > Cr2(S04)3 +3Fe2(S04)3+ K2SO4 + 7H2O K2Cr207 + HCl Cb K2Cr207 + 14HC1 > 2CrCl3 + SCb + 2KCI + 7H2O K2Cr207 + H2S+H2S04- +S K2Cr207 + 3H2S + 4H2SO4 > Cr2(S04)3 + 3S + K2SO4 + 7H2O HS quan sat thi nghiem va nhan xet GV lam... Cu sinh ra d (2) la: 1,88 - 0,64 = 1 ,24 (gam) Dat lugng Fe tham gia (2) la x Khdi lugng Fe du la: 1 , 12 - 56x Khdi lugng Cu sinh ra d (2) la 64x Ta cd: (1 , 12- 56x) + 64x= 1 ,24 -> x = 0,015 Lugng CUSO4 trong 25 0 ml dung dich da phan irng bet: 0,015 + 0,01 =0, 025 (mol) Ndng do mol cua dung dich CUSO4 da dung la 0, 025 0 ,25 0,1 (mol/1) 58 a) Luang CUSO4 dem boa tan: = 0 ,23 2 (mol) , 25 0 0 ,23 2 = 0,464 (mol/l)... hidroxit, mudi - Sdt kim logi: sit (III) nhu thi nao? 2Fe + 3Cl2 - ^ ^ 2FeCb 4Fe + 3O2 '" ) 2Fe203 -Hgp chdt sdt (111): FeCb +CI2 ^ ^ FeCb 21 7 Hogt dpng ciia GV Hogt dpng cda HS 4Fe(OH )2 + O2 + 2H2O >-4Fe(OH)3 FeO +4FINO3 -> Fe(N03)3+ NO2 +2H2O - Hgp chdt sdt (111): Fe^" + 30H" ^Fe(0H)3 Fe203 + H2SO4 -> Fe2(S04)3 + H2O Fe(0H)3 — ^ Fe203 + H2O 3 Ung dung ciia hgp chat sit(III) GV chieu len man hinh mdt... ->.FeCb + H2 Fe + H2O -^ FeO H2 - Hgp chdt sdt (11): Fe(0H )2 ^''""^,^"""^ ) FeO + H2O Fe^" + 20 H~ ^Fe(0H )2 FeO + H2SO4 -^ FeS04 + H2O - Hgp chdt sdt (III): GV luu y HS: Hgp chit sit(ll) dilu Fe203 + H2 ^ ^ 2FeO + H2O ehi xong thi sir dung ludn d l lau 2FeCl3 + Fe ^ SFeCb 21 5 Hogt dpng ciia GV Hogt dpng cda HS trong khdng khi se chuyen dan sang hgp chit sit (111) Vidu: • 4FeCl2+4HCl+ 02 -> 4FeCl3+2H20 3 Ung...Hocit dpng ciia GV Hogt dpng cda HS 2KOH + 2Cr03 > K2Cr207 + H2O Kali dicromat - Cr03 la chat oxi hoa manh 2Cr03 + 2NH3 '" ) Cr203 +N2 + 3H2O 4Cr03 + 3C - ^ ^ 2Cr203 + 3CO2 2 Muoi cromat va dicromat GV cho HS quan sat mau tinh the HS quan sat va nhan xet K2Cr04, K2Cr207 hay (NH4)2Cr207 - Mudi dicromat cd mau da cam sau dd hoa tan vao nude Yeu eau HS - Mudi cromat... 4H2O Phuong trinh hoa hgc dang phan tir: K2Cr207 + 3Na2S + 7H2SO4 _^ Cr2(S04)3 + K2SO4 + 3 Na2S04 +7H2O + 3S Phuang trinh boa hgc dang ion: Cr^O^ + 3S'-+ 1 4 H " ^ 2 C r ' " + 3 S + 7H20 a) Phuang trinh hoa hgc: 2CrCl3 + 3Cb +16NaOH -^ 2Na2Cr04 + 12NaCl + 8H2O CrCb la chat khir vi sd oxi hoa ciia crom trong hgp chit nay tang tir +3 len +6 trong hgp chat Na2Cr04 Cb la chat oxi hoa vi sd oxi boa ciia... 3FeO+10HNO3-^3Fe(NO3)3+NO+5H2O 4Fe(OH )2 + O2 + 2H2O >4Fe(OH)3 (trang xanh) (nau) 2FeCb + C b -^•2FeCb 10FeSO4 + 2KMn04 + 8H2SO4 ^ 5Fe2(S04)3 + 2MnS04 + K2SO4 + 8H2O GV nhan manh: Tinh chit dac trung ciia hgp chat sat(II) la tinh khir giiip HS luu y - Tinh oxi hod: FeO + H2 ^ ^ Fe + H2O Mg + FeCb -> MgCb + Fe GV ed the bieu dien thi nghiem: HS quan sat GV bieu dien thi nghiem, thao luan va nhan xet - TNI: Lay 2ml dung... la 3d Vay cau hinh electron ciia M la A ls^2s^2p^3s^3p^3d^4sl B ls^2s^2p^3s-3p^3d^ C ls^2s^2p^3s^3p^4s^3d^ D lsV2p^3s^3p^3d^4s^4p' Bai 2 Hoa tan 16,8g Fe vao dung dich Bai 2 Chgn dap an C HNO3 thu dugc 4,48 lit khi NO duy 14- TKBG HOA H ... sau K2Cr207 + FeS04 + H2SO4 > K2Cr207 + 6FeS04 +7H2SO4 > Cr2(S04)3 +3Fe2(S04)3+ K2SO4 + 7H2O K2Cr207 + HCl Cb K2Cr207 + 14HC1 > 2CrCl3 + SCb + 2KCI + 7H2O K2Cr207 + H2S+H2S04- +S K2Cr207 + 3H2S... trinh hoa hgc: a) K2Cr207 + 3H2S + 4H2SO4 - Cr2(S04)3 + K2SO4 + 7H2O + 3S b) K2Cr207+14HCl ^ 2CrCb - 3Cl2 + 2KCI + 7H2O c) K2Cr207 + 6FeS04 + 7H2SO4 > Cr2(S04)3 + K2SO4 + 7H2O + 3Fe2(S04) Trong eac... nao? 2Fe + 3Cl2 - ^ ^ 2FeCb 4Fe + 3O2 '" ) 2Fe203 -Hgp chdt sdt (111): FeCb +CI2 ^ ^ FeCb 21 7 Hogt dpng ciia GV Hogt dpng cda HS 4Fe(OH )2 + O2 + 2H2O >-4Fe(OH)3 FeO +4FINO3 -> Fe(N03)3+ NO2 +2H2O