| T O P I C R E V I E W |
| vxchinh |
Posted - 07/03/2003 : 13:31:29
ai giup minh voi
chinh
|
| 11 L A T E S T R E P L I E S (Newest First) |
| babydinhtruong |
Posted - 12/04/2003 : 17:44:58
Chao cac huynh de ti muoi than thuong!
Cu tuong rang nhung cau hoi nay cua tieu de se mai mai nam trong sot rac chu, nhung khong ngo lai nhan duoc nhieu su quan tam nhu vay. Rat cam on su chi bao cua cac su huynh, va chac chan 99% la cac su huynh deu la cac sinh vien cu khoi roi!
Nhung cau tra loi tuy la chua the giai quyet triet de nhung thac mac cua tieu de, nhung it ra thi cung giup tieu de bot ngoc hon.
Ve khai niem luong tu thi em co hieu (du la khong the nam bat 100%), nhung lieu co thien ve li thuyet qua khong nhi? Chi dua vao cac so luong tu de giai thich mot van de co lien quan den co hoc, luc hoc thi cung co ve hoi thieu thuc te, cac huynh co cam thay vay khong? Nhung danh phai chap nhan vay!
Con ve su quay cua cac e thi em hieu chu, nhung that la mot dieu kho chiu khi khong duoc "thay" mo hinh khong gian cua nguyen tu de xem no quay nhu the nao ma dam bao duoc hinh dang cua cac loai obitan(von da co hinh dang xac dinh roi!), va dieu kho chiu hon nua la SGK thi trinh bay qua so luoc. NHung danh vay, vi SGK pho thong ma!
Cac huynh thay van de no phuc tap nhu vay do, vay thi co anh nao co the dung tin hoc nhu mot cong cu de mo hinh hoa cac nguyen trong khong gian khong ? Hoc the nay thi "chay" qua!Va em la mot trong so nhung nguoi chiu kho ne!
Cac huynh cam nghi sao?Chuc cac huynh de ti muoi luon hoc gioi!
|
| myloveWL |
Posted - 05/04/2003 : 21:10:59
tr�ch:
Xin gui loi chao than thuong đen tat ca huynh đe ti muoi!
Tieu đe dot Hoa, mong đuoc giup đo:
1/Hong hieu tai sao cac nguyen tu khi hiem lai khong tham gia phan ung hoa hoc? "Vi co 8 electron o lop ngoai cung"- cai nay thi nghe nham roi!Nhung van đe o cho:co 8 electron ngoai cung thi sao?KHong tham gia PƯHH tuc la hong cho muon electron, va cung hong them nhan electron cua ai cho?Co che luc hoc nao lam cho nguyen tu khi hiem "bao thu" va "ich ki "vay?
2/Hong hieu tai sao ma cac phan lop : s, p, d, f chi duoc co toi da 1, 3,5, 7 obitan ma hong duoc co nhieu hon?
3/Hong hieu tai sao moi obitan chi duoc co toi da 2 electron ma hong duoc quyen co nhieu hon (co ai cam dau)?Va bat buoc rang so electron doc than tren moi obitan phai la toi da?Hon nua, 2 electron tren mot obitan phai la hai mui ten nguoc chieu chu hong duoc cung chieu? La ghe !
4/Obitan la dam may electron, va co hinh dang xac dinh.Nhung electron thi quay quanh hat nhan nguyen tu kia ma! Vay co che nao giup electron vua quay quanh hat nhan, vua dam bao hinh dang cua obitan?
Mong nhan duoc loi giai dap.Tieu đe thanh that cam on!
dinhtruong1985@yahoo.com
A minh la dan moi trong forum nay ..nhung lai rat thich thu khi vao day ...
A co the minh chia se mot so dieu minh biet ( co gi sai sot mong nhan hoi am de dinh chinh kien thuc kip thoi ! )
Cau 1 : co mot ban da tra loi roi , minh rat dong y ...ve van de dat co cau nang luong vung ben thi tro ...duong nhu dieu nay cung kha de hieu va de chap nhan , con neu khong thi cung xin bo tay ..
cau 2 : ve so Orbital toi da o cac phan lop do thuc nghiem tim thay , va da tro thanh qui uoc de co the tiep tuc di sau vao cac van de khac mang tinh cot loi hon ...vi du phai co nhung tien de ( la nhung gi khong the phu nhan ) thi moi co duoc dinh li ..!!
cau 3 : cung da co ban tra loi roi ...minh cung thay khng biet noi gi them ...so e toi da trong mot Orbital giong nhu mot don vi do nho nhat trong khi xem xet cau tao nguyen tu !
Cau 4: Cau nay ban hoi rat hay , tai hoi do khi hoc minh cung mo ho lam ...nhung theo minh thi ban phai hieu dung ve khai niem Orbital ( boi vi chuong trinh pho thong dua khai niem qua don gian ..den muc ta kho hieu duoc cu the ..phai khong ? ) Orbiatal la mot trang nang luong duoc xac dinh boi 4 so luong tu : n,l,m ( e ) , m ( s ) ...( ki hieu mang tinh qui uoc ! ) boi vay trang thai quay cua e la tung trang thai xac dinh voi moi muc nag luong boi vay ta khong tim thay cu the vi tri e ma chi co the tim thay vung khong gian xac suat tim thay e la lon nhat (xap xi 90% thi phai ) -> dam may e !
Con ve van de tu quay cua e thi rat ngo ! Electron khong phai tu quay nhu chung ta van hieu thong thuong , su tu quay cua no giong nhu su xoay theo nhieu huong khac nhau tung phan tu co the goi la tung lop vo e ! ..cha that kho dien ta : giong ngu ta van vo trai cam dong thoi theo nhieu huong khac nhau vay do chu khong phai chi la quay len hoac quay xuong ! Do vay ban than su tu quay nay da kho xac dinh huong ho noi den vi tri chinh xac tai mot thoi diem nen chung ta thay rang dua ra van de dam may e de de hieu ! . Cha ban co the tim hieu ki hon trong cac giao trinh Hoa dai Cuong ve cau tao nguyen tu cua thay Nguyen Duc Chung hay thay Nguyen Dinh Soa ! ( vi sach pho thong con han che trinh bay ! ) ...
|
| xine-danlinh |
Posted - 04/04/2003 : 20:33:43
co che de cho cac electron vua quay quanh hai nhan vua giu duoc hinh dang obitan chinh la luc lien ket giua E voi hat nhan trong do co the co luc huong tam . va ca luc tuong tac giua cac E khac phan lop voi nhau
tham khao thoi nhe . truoc day minh cung hay thac mac nhu ban nhung tu khi bi co giao mang la tinh vi . minh rat ngai hoi.
chao!
1112
|
| xine-danlinh |
Posted - 04/04/2003 : 20:23:53
tui nghi rang phai dua tren van de nang luong . lam the nao de cho nang luong cua nguyen tu va phan tu la nho nhat tuc la chung ben vung nhat . va so di so electron doc than phai lon nhat cung la vi ly do nay ( boi chung phai chiem nhung vi tri co nang luong thap truoc) cung co luc do bi kich thich chung don vao mot obitan nhung trang thai nay khong ben
con nguyen tu cac khi hiem tro voi phan ung hoa hoc la vi 8 electron o lop ngoai cong da tao cho nguyen tu mot nang luong lien ket rat ben vung kho co the dat toi trang thai ben hon
con trong 1 obitan hai electron phai co spin trai chieu thi ban phai biet rang chung mang dien tich cung dau voi nhau dau the song hanh duoc( kheo sap gan nhau chung lai day nhau ra tao ra hai huong chuyen dong nguoc nhau )
con trong mot obitan khong the co qua hai electron duoc . mot con duong chi du rong cho 2 xe tai di qua thi 3 xe tai xe khong cung mot luc di duoc ma phai co mot xe chuyen sang lan duong khac
1112
|
| Hihihahihi |
Posted - 04/04/2003 : 19:39:27
tr�ch:
Xin gui loi chao than thuong đen tat ca huynh đe ti muoi!
Tieu đe dot Hoa, mong đuoc giup đo:
1/Hong hieu tai sao cac nguyen tu khi hiem lai khong tham gia phan ung hoa hoc? "Vi co 8 electron o lop ngoai cung"- cai nay thi nghe nham roi!Nhung van đe o cho:co 8 electron ngoai cung thi sao?KHong tham gia PƯHH tuc la hong cho muon electron, va cung hong them nhan electron cua ai cho?Co che luc hoc nao lam cho nguyen tu khi hiem "bao thu" va "ich ki "vay?
2/Hong hieu tai sao ma cac phan lop : s, p, d, f chi duoc co toi da 1, 3,5, 7 obitan ma hong duoc co nhieu hon?
3/Hong hieu tai sao moi obitan chi duoc co toi da 2 electron ma hong duoc quyen co nhieu hon (co ai cam dau)?Va bat buoc rang so electron doc than tren moi obitan phai la toi da?Hon nua, 2 electron tren mot obitan phai la hai mui ten nguoc chieu chu hong duoc cung chieu? La ghe !
4/Obitan la dam may electron, va co hinh dang xac dinh.Nhung electron thi quay quanh hat nhan nguyen tu kia ma! Vay co che nao giup electron vua quay quanh hat nhan, vua dam bao hinh dang cua obitan?
Mong nhan duoc loi giai dap.Tieu đe thanh that cam on!
dinhtruong1985@yahoo.com
Chao babydinhtruong!
Rat thu vi! Do la dieu minh muon noi ve nhung cau hoi cua ban! Hoc Hoa hoc noi rieng va cac mon khoa hoc khac noi chung,phai biet thac mac,biet dat cau hoi cho nhung cho minh chua ro thi se~ cang ngay cang gioi!Hoan nghenh tinh than hoc tap cua babydinhtruong!
Ve may cau hoi cua babydinhtruong,thuc ra,de tra loi cho thoa dang qua la khong de ti nao.Hau het cac ket qua hoc sinh duoc biet hien nay deu coi nhu thua` nhan.,vi du nhu "tai sao lop vo electron lai chi ben vung khi co 8electron" hay "tai sao cac phan lop s,p,d,f chi co 1,3,5,7 AO"....Nhung ket qua nay duoc tim thay trong qua trinh nghien cuu Hoa hoc luong tu.Day la nhung van de rat phuc tap,ma neu co noi ra,cung khong biet ban co hieu duoc khong.Hon nua,toi cung khong cho la minh biet nhieu ve Hoa hoc luong tu!
De babydinhtruong thay duoc su phuc tap cua Hoa hoc luong tu,toi xin tra loi mot y trong cau hoi thu 3 cua ban,do la tai sao " 2 electron tren mot obitan phai la hai mui ten nguoc chieu chu hong duoc cung chieu?"
Cai dau mui ten len,xuong trong ki hieu mot AO la ki hieu cho gia tri spin cua electron.Xin noi qua ve qua trinh phat hien ra so luong tu spin.
Spin cua electron duoc Stern vaf Gerlach xac dinh bang thuc nghiem.Mot chum nguyen tu bac duoc ban qua mot tu truong manh khong dong deu.Nguoi ta thay rang chum hat nay tach han lam hai chum: mot chum lech di nhu la moi nguyen tu cua no la mot luong~ cuc tu huong doc theo huong cua tu truong;chum kia lech gionh nhu mot luong cuc tu cung do lon nhung huong theo chieu nguoc lai.Nhu vay,ta co co so de tin rang momen dong luong toan phan do cac electron chuyen dong tren cac qui dao cua chung tao nen se bang khong doi voi nguyen tu bac binh thuong va momen tu nhan duoc bang thuc nghiem chi do electron hoa tri doc nhat sinh ra.Do do,thi nghiem cua Stern-Gerlach la phep do dac truc tiep momen tu` cua electron.
[red]Trong 1 AO co 2 electron.2 e trong AO da~ co chung 3 so luong tu n,l,m nen so luong tu thu tu,la` so luong tu tu` spin phai khac nhau,cu the la co 2 gia tri +1/2 va` -1/2.Vi the,khi ki kieu 2 e trong 1 AO,phai ki hieu bang 2 mui~ ten nguoc huong.[red]
Hic,khong biet noi nay gio babydinhtruong co hieu duoc ko?Nhung thoi,du sao cung phai chap nhan thuc te' la` voi kien' thuc' pho thong,khong the tra loi duoc nhung~ cau hoi do'! Hi vong,neu babydinhtruong hoc len DH theo con duong Hoa hoc,se~ co the giai dap nhung cau hoi nay`!
Chuc vui ve!
Moi cac ban ghe tham CLB Hoa Hoc:
http://ttvnol.com/forum/f_347
http://hoahoc.ttvnonline.net
|
| salem85 |
Posted - 19/03/2003 : 21:15:56
Em hoi co ve cat co nhi. Thuc ra hoa hoc la 1 mon khoa hoc thuc nghiem, dua vao cac du kien thuc nghiem, nguoi ta de ra cac thuyet giai thich cho cac ket qua thu duoc vi du nhu : thuyet lai hoa, thuyet obitan phan tu, thuyet bien electron� Neu em muon biet chi tiet hon thi ve hoc lai lop 10 di. Co the doc them chuong �cau tao nguyen tu� o cac sach �tai lieu giao khoa chuyen hoa hoc 10, tap 1�, �hoa hoc dai cuong_ Nguyen Duc Chung�,�hoa vo co, tap 1 _ Hoang Nham�
|
| babydinhtruong |
Posted - 16/03/2003 : 17:33:24
Xin gui loi chao than thuong đen tat ca huynh đe ti muoi!
Tieu đe dot Hoa, mong đuoc giup đo:
1/Hong hieu tai sao cac nguyen tu khi hiem lai khong tham gia phan ung hoa hoc? "Vi co 8 electron o lop ngoai cung"- cai nay thi nghe nham roi!Nhung van đe o cho:co 8 electron ngoai cung thi sao?KHong tham gia PƯHH tuc la hong cho muon electron, va cung hong them nhan electron cua ai cho?Co che luc hoc nao lam cho nguyen tu khi hiem "bao thu" va "ich ki "vay?
2/Hong hieu tai sao ma cac phan lop : s, p, d, f chi duoc co toi da 1, 3,5, 7 obitan ma hong duoc co nhieu hon?
3/Hong hieu tai sao moi obitan chi duoc co toi da 2 electron ma hong duoc quyen co nhieu hon (co ai cam dau)?Va bat buoc rang so electron doc than tren moi obitan phai la toi da?Hon nua, 2 electron tren mot obitan phai la hai mui ten nguoc chieu chu hong duoc cung chieu? La ghe !
4/Obitan la dam may electron, va co hinh dang xac dinh.Nhung electron thi quay quanh hat nhan nguyen tu kia ma! Vay co che nao giup electron vua quay quanh hat nhan, vua dam bao hinh dang cua obitan?
Mong nhan duoc loi giai dap.Tieu đe thanh that cam on!
dinhtruong1985@yahoo.com
|
| might |
Posted - 15/03/2003 : 15:26:04
tao lao wa cu the la cai bai nao
|
| VUDUONG |
Posted - 13/03/2003 : 13:26:57
tr�ch:
ai giup minh voi
chinh
|
| vxchinh |
Posted - 07/03/2003 : 13:45:04
tr�ch:
cach bien luan CTTQ cua RUOU,AXIT CACBOXY
chinh
chinh
|
| salem85 |
Posted - 07/03/2003 : 13:36:22
cu the thi em muon giup gi?
|
|
|
