Hogt dgng 1
CONG VIEC D A U B U O I THl/C H A N H
GV chia lop hgc thanh cac nhom moi nhom 4 din 5 HS.
GV neu muc tieu, yeu cau, nhan manh cac luu y trong buoi thuc hanh, yeu cau arm toan khi dun nong, lam viec voi axit, xiit...
HS theo doi va lang nghe
Hogt dgng 2
THI NGHIEM 1: P H A N LTNG BROM HOA ANILIN GV yeu cau HS neu cac tinh chat hoa
hpc ciia anilin.
GV yeu cau HS chuan bi cac dung cu va hoa chat cho thi nghiem.
GV huong dan HS tien hanh thi nghiem nhu SGK va yeu cau:
- Quan sat. - Neu hien tugng. - Giai thich.
HS thao luan va nhan xet: anilin co cac tinh chat ciia bazo
- Tac dung voi axit manh. - Phan ling brom hoa
HS chuan bi boa chat: Dung dich anilin bao boa, nuoc brom.
Dung cu: Ong nghiem, ong hiit, cap ong nghiem.
HS nghien ciiu SGK va tien hanh thi nghiem:
Dimg ong nho gipt cho vao ong nghiem 0,5 ml dung dich anilin bao hoa, sau do cho them 1 ml nuoc brom bao boa, lac nhe ong nghiem
Hien tuang: Khi nho dung dich brom
vao dung dich anilin bao hoa xuat hien ket tiia trang
Hogt dgng cUa GV Hogt dgng cua HS
GV nhan xet va b l sung: Ngoai ra anilin con bi kit tiia trong axit HNO3 dac, yeu ciu HS tiln hanh thi nghiem kiem tra
Gidi thich: Do anh huong cua nh6m
NH2 din din 3 nguyen tit H o vi tri ortho va para so voi nhom NH2 trong nhan thom ciia anilin da bi thay thi bai 3 nguyen tir brom theo phuong trinh h6a hoc + 3Br2 NH2 + 3HBr i(trang) Hogt dgng 3
THI NGHIEM 2: P H A N LTNG CUA GLYXIN W6\ C H A T CHI THI GV yeu ciu HS neu ciu tao ciia glyxin
va du doan kha nang tac dung voi mau quy tim.
GV yeu ciu HS chuan bi dung cu, h6a chit cho thi nghiem phan img cua glyxin voi quy tim.
GV luu y HS nen sir dung tiet kiem boa chat.
GV huong dan HS tiln hanh thi nghiem nhu SGK va yeu ciu:
- Quan sat.
HS thao luan va nhan xet: Glyxin co mot nhom NH2 co tinh baza ylu va mot nh6m COOH co tinh axh yeu.
Do CO 1 nh6m NH2 va 1 nhom COOH nen glyxin khong c6 kha nang lam doi mau quy.
HS chuin bi dung cu boa chit cho thi nghiem.
Hoa chit: dung dich glyxin 2%, dung dich quy tim (hoac giiy quy).
Dung cu: Ing nghiem, ong hiit, cap ong nghiem.
HS tiln hanh tbi nghiem
Cho 1ml dung dich gixin 2% vao ong
Hogt dgng cUa GV - Neu hien tugng.
- Giai thich.
GV bo sung: Co the dung chi thi metyl da cam de thay cho viec diing quy tim.
Hogtt
Hogt dgng cda HS
ong nghiem dimg gixin 2-3 gigt dung dich quy tim
Hien tuang: Dung dich khong doi mau
ma chi co mau tim ciia chat chi thi.
Gidi thich: Do trong phan tir glyxin co
ca nhom NH2 va nhom COOH nen moi truong gan trung tinh vi vay quy tim khong doi mau.
igng 4
THI NGHIEM 3: P H A N LTNG M A U CUA PROTEIN VCJl Cu(0H)2 GV yeu cau HS chuan bi dung cu, boa
chat cho thi nghiem phan ling mau biure
GV huong dan HS tien hanh thi nghiem nhu SGK va yeu cau:
- Quan sat. - Neu hien tugng. - Giai thich.
HS chuan bi dung cu boa chat cho thi nghiem.
Hoa chat: Long trang triing, nuoc cat. dung dich NaOH, dung dich CUSO4. Dung cu: ong nghiem, ong hiit, cap ong nghiem.
HS tien hanh thi nghiem duoi su huong dan cua GV:
Dung ong nho gigt cho vao ong nghiem 0,5 ml long trang tning, sau d6 cho them 1-2 ml nuac cat, lac nhe ong nghiem tao ra dung dich protein. Cho tilp 1-2 ml dung dich NaOH 30% (dac), 1-2 gigt CUSO4 2% roi lac ong nghiem
Hien tuang: Dung dich xuat hien mau
tim dac tnmg.
Gidi thich: Do tao ra Cu(0H)2 theo
Hogt dgng cua GV Hogt dgng cda HS
GV huong dan HS giai thich.
GV bo sung: Phan img nay diing de nhan biet protein.
2NaOH + CUSO4 ^ Na2S04 + Cu(0H)2 Phan img giiira Cu(OH)2 voi cac nhom peptit - C O - N H - tao ra phiic co mau tim.
Hogt dgng 5
CONG VIEC SAU BUOI THLfC H A N H
GV nhan xet ve buoi thuc hanh va huong dan HS thu dgn boa chat, rira ong nghiem va dung cu thi nghiem, ve sinh phong thi nghiem.
GV yeu cau HS lam tuong trinh theo mau:
HS thu dgn, ve sinh phong thi nghiem can than, an toan.
HS lam tuong trinh theo mau sau day:
Ngay thang nam. Ho va ten:
Lap:
T 6 thi nghiem:
Tyong trinh hoa hpc bai so: Ten bai:
Ten thi nghiem Phipang phap t i l n hanh
/
Hien tu'vng quan sat
Giai thich - vi§t phu>o>ng trinh
Chifcng 4. POLIME VA VAT LIEU POLIME
Bai 16. DAI Cl/ONG VE POLIME
A. MUC TIEU BAI H O C
1. Ki§n thiFC
HS biit:
• Biet khai niem chung ve polime: Khai niem, phan loai, cau tnic, tinh chat.. • Cac phuong phap dieu che polime.
HS hieu: Phan ling trimg hgp, tning ngung va nhan dang dugc monome de tong
hgp polime.
2. KT nang
• Phan loai, ggi ten cac polime.
• So sanh phan ling triing hgp voi phan ling triing ngung. • Viet cac phuong trinh boa hgc tong hgp ra polime.
3. Tinh cam, thai do
Thay dugc tam quan trgng cua hgp chat polime trong doi song, san xuat va phuang phap tong hgp ra chiing, tir do hiing thii tim hieu ve polime.
B. C H U A N BI C U A GV VA HS
• GV: - May tinh, may chieu, cac phieu hpc tap.
- Bang tong ket, so do, hinh ve lien quan den bai hpc. • HS: Xem truoc bai polime.