Chất hóa học gây cười

Phn tch: y l mt hin tng c ngha rt ln trong thc tin. Ti sao khi nh ri nhit k thy ngn, khng c dng chi qut m li rc bt S ln ch c Hg? Gii Hg l mt cht lng linh ng, v vy khi nh ri nhit k thy ngn ta khng th dng chi qut Hg c, v lm nh vy thy ngn s cng b phn tn nh, v cng gy kh khn cho qu trnh thu gom. Vic thu gom HgS tr nn thun tin hn. Phn tch: gii bi tp ny, hc sinh cn nm c phn ng gia Hg v S. Nhm III Ti sao phn chua li c kh nng lm trong nc?

V sao ngy xa ng cha ta thng ngm qun o xung bn gi qun o khng b phai? Gii Phn chua lm trong nc v trong thnh phn ca phn chua c Al2 SO4 3. Trong Al OH 3 dng keo c b mt rt pht trin, hp ph cc cht l lng trong nc, ko chng cng lng xung di. Trong cng nghip giy, nhm sunfat hay phn nhm c cho vo giy cng vi mui n, nhm clorua to nn do phn ng trao i b thy phn mnh hn, to nn hiroxit, hiroxit ny s kt dnh nhng si xenluloz li vi nhau lm cho giy khng b nhe mc khi vit. Khi nhum vi, hiroxit c si vi hp ph v gi cht trn si s kt hp vi phm nhum to thnh mu bn, cho nn c tc dng lm cht cn mu.

Chnh v vy nn ta c th ngm qun o d phai mu vo nc phn, hay ngy xa thng ngm qun o xung bn gi qun o khng b phai mu. Ti sao hng ngc c mu , cn bch ngc li c mu xanh? Corunum nng chy C, si xp x C v rt cng, ch thua kim cng, bo trinitrua BN, v cacborunum. Nh c cng cao, corunum c dng lm mi hoc bt mi kim loi. Hng ngc qu rubi hay bch ngc qu xaphia u l corunum tinh khit Al2O Phn tch: Bi tp trn ch nhm mc ch cung cp thm kin thc cho hc sinh.

Ti sao thc t ngi ta khng dng cc bng nhm ng nhng cht, dung dch c tnh kim? Gii Bi trong dung kim lp oxit bo v bn ngoi ca cc bng Al s b ph hy. Ti sao nhit nng chy ca Ga rt thp 29,C nhng nhit si ca n li rt cao C? Gii: Do Ga tn ti mng tinh th phn t ti cc mt ca mng li l cc phn t Ga2. Lin kt gia cc phn t Ga2 trong tinh th l tng tc Van ec Van. Cn nhit si ca Ga rt cao l v trc tin cn cn cung cp nhit phn t Ga2 vn tn ti trong trng thi lng phn hy thnh nguyn t, sau mi a cc nguyn t Ga lng ln trng thi hi. Phn tch: gii bi tp ny, hc sinh cn nm c tnh cht mng tinh th, cu trc nt mng tinh th Ga, th no l nhit nng chy v nhit si.

Nhm IV. Hy gii thch ti sao dng a, tha, bng thic trong kho qua ma ng lnh th bin mt, ch cn libt tro. Gii Thic c 3 dng th hnh c th bin i ln nhau: Trn nhit , n chuyn sang dng Sn-. Thic l kim loi mu trng bc nn gi l thic trng, n bn trong khong nhit t Thic iu kin thng tn ti dng Sn-, khi nhit xung thp di Hin tng ny cn c gi l bnh dch thic. Phn tch gii bi tp ny, hc sinh cn nm c cc dng th hnh ca Sn, v thic l mt nguyn t khng c hc trong chng trnh, nn bi tp ny ch nhm mc ch cung cp thm kin thc cho hc sinh.

Hy gii thch ti sao nhng bc tranh c v bng bt ch, thnh phn chnh l mui baz 2PbCO3. Pb OH 2 thng c mu en?

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Ti sao c th dng H2O2 phc hi bc tranh c ny? Gii Nhng bc tranh c v bng bt ch thnh phn chnh l mui baz 2PbCO3. Pb OH 2. Khi lu bt ch tc dng vi H2S trong khng kh to thnh PbS mu en. Vai tr to phc y cng tng t nh vai tr ca axit lactic c cp n trong bi nhim c As trong nhm V. Phn tch: Bi tp ny ch nhm mc ch cung cp thm kin thc cho hc sinh.

C l bi tp ny ph hp cho hc sinh trng chuyn hn. Khi phn tch hm lng cc nguyn t ni chung c trng ven ng quc l, ngi ta thy rng hm lng Pb trong cy cao hn hn so vi hm lng Pb cng ca loi cy nhng trng ch khc. Hy gii thch? Gii Hm lng Pb cao t bin trong cc cy xanh trng bn ng quc l l do cy hp th Pb trong khi xng du do cc phng tin c gii thi ra.

Nh ta bit rng trc y trong xng du ngi ta thng pha mt lng tetraetyl ch Pb C2H5 4 tng ch s octan, do khi xng chy thi ra ngoi mi trng mt lng ln ch. Phn tch: gii bi tp ny, hc sinh cn phi lin h vi thnh phn ca xng c mt hm lng Pb ng k. Lea gratis durante 30 días. Chiropractic control is viewed as the best moderate treatment for thoracic joint brokenness. Chiropractors work to reestablish scope of movement and joint arrangement. The most eye issues originate from eyes that are over pushed. Since it is essentially difficult to keep away from strain on your eyes, the following best thing would be to de-stress them when they do wind up stressed.

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