Cho Mng Qu Thy C V Cc Bn n Cu Lc B Ha Hc

Phn I: Cac cu hoi vi sao

Phn II: Ch 1.2.3.4.5.6.7.8.(9)

Cu 1: V sao nm t n xung ao lm c cht? t n c thnh phn chnh l canxi cacbua CaC2, khi tc dng vi nc sinh ra kh axetilen v canxi hiroxit.CaC2 + 2H2O C2H2 + Ca(OH)2

Axetilen c th tc dng vi H2O to ra anehit axetic. Cc cht ny lm tn thng n hot ng h hp ca c v vy c th lm c cht.

Cu 2: V sao ngi ta thng dng tro bp bn cy? Trong tro bp c cha mui K2CO3 cung cp nguyn t kali cho cy.

Cu 3: V sao mui NaHCO3 c dng ch thuc au d dy? NaHCO3 dng ch thuc au d dy (bao t) v n lm gim lng axit HCl trong d dy nh phn ng:NaHCO3 + HCl NaCl + CO2 + H2O

Cu 4: V sao trong cng nghip thc phm, mui (NH4)2CO3 c dng lm bt n? (NH4)2CO3 c dng lm bt n v khi trn thm vo bt m, lc nng bnh (NH4)2CO3 phn hu thnh cc cht kh v hi nn lm cho bnh xp v n.

(NH4)2CO3 2NH3 + CO2 + H2O

Cu 5: i vi c th mui iot c vai tr nh th no ? - c th kho mnh, con ngi cn c cung cp y cc nguyn t ho hc cn thit. C nhng nguyn t cn c cung cp vi khi lng ln v c nhng nguyn t cn c cung cp vi khi lng nh (vi lng). Iot l mt nguyn t vi lng ht sc cn thit i vi con ngi. Theo cc nh khoa hc, mi ngy c th con ngi cn c cung cp t 1.10-4 n 2.10-4 gam nguyn t iot.C th tip nhn c phn iot cn thit di dng hp cht ca iot c sn trong mui n v mt s loi thc phm. Nhng vic thiu ht iot vn thng xy ra. Hin nay, tnh trn ton Th Gii mt phn ba s dn b thiu iot trong c th. Vit Nam , theo iu tra mi nht, 94% s dn thiu ht iot nhng mc khc nhau.

Cu 5: i vi c th mui iot c vai tr nh th no ?

- Thiu ht iot trong c th dn n hu qu rt tai hi. Thiu iot lm no b h hi nn ngi ta tr nn n n, chm chp, c th ic, cm, lit chi, ln. Thiu iot cn gy ra bnh bu c v hng lot ri lon khc, c bit nguy him i vi b m v tr em. khc phc s thiu iot, ngi ta phi cho thm hp cht ca iot vo thc phm nh : mui n, sa, ko.

- Vic dng mui n lm phng tin chuyn ti iot vo c th ngi c nhiu nc p dng.Mui iot l mui n c trn thm mt lng nh hp cht ca iot (thng l KI hoc KIO3 ). Th d: Trn 25 kg KI vo mt tn mui n.Ngi ta cng cho thm hp cht iot vo bt canh, nc mm .Vic dng mui iot tht d dng v n gin. V mi v, mu sc, mui iot khng khc g mui n thng. Tuy nhin hp cht iot c th b phn hu nhit cao. V vy phi thm mui iot sau khi thc phm c nu chn.

Cu 6: V sao khi luc rau mun nn cho mui n (Natriclorua ) Do nhit si ca nc nguyn cht p sut p = 1atm l 10000C, nhit si ca nc c cha mui n cao hn 10000C l nguyn nhn lm cho rau mun nhanh chnh hn , thi gian luc rau khng lu nn lm vitamin t b phn hy V vy rau s mau mm hn v xanh hn

Cu 1: (7 ki t)Dang tn tai chinh cua mui v c?

Cu 2: (8 ki t)y l ni cha ng hm lng mui halogenua ln nht trn Tri t

Cu 3: (10 ki t)Loai lin kt chu yu trong cac phn t mui?

Cu 4: (12 ki t)Cac ion khng lm thay i pH ca dung dch so vi nc nguyn cht l loi ion no?

Cu 5: (5 ki t)S chuyn th t dung dch sang mui khan c thc hin qua qu trnh no?

Cu 6: (7 ki t) Qu trnh din ra khi ha tan cc mui tan vo nc

Cu 7: (9 ki t) Cation kim loi no khi t chy trn ngn la v sc cho nh sng khng mu?

Cu 8: (8 ki t)Anion n nguyn t c th to kt ta mu trng vi dung dch bc nitrat?

T KHOA:Gi y: Ta nn a dung dch ny vo c th vi hm lng cao gim bt s bi tit m hi ap an: Natri Clorua

(LI CHAO)