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CHt TAD VA SlJl DUNG CAC THI N G H p VE SD TIT HDA CDA CAC CHAT VAO DAY HOC MON VAT LJ U TRUNG HOC PHO THONG ThS K hi hpe SutUhoacua cacchitihuoc chuong r / f f r v o n j (Vat li 11} trung hpc phd'thdng, hpc smh (HS) can n l m dupc su tif hoa cua eac ehat thuan tu, nghich ti^vi sittO-khi dat ehung td tn/dng ngoai Hien nay, hpc tap eac kien tilde nay, HS phai "hpe chay" vi chua ed cac thinghiem (TN) de giao vien (GV) to ehu'c cac hoat dpng nhan Blue cho HS.Trong tti ucle,HS da biet khisit, til ep dat lOr trudng cua nam cham thi bj nam cham hut nhung dgt dong, nhdm tir tnrdng cua nam cham thi dong, nhdm khong chju lueliirtac dung Quan ni?m dong, nhom dat tu'trudng cua nam cham khdng chiu luc tutae dyng la mot quan niem sai lam cua HS Dong la ehat nghich tCrnen dat dong tCriR/dng cua nam cham se chiu luc day, cdn nhom la chat thuan tiise chju lue hut Tuy nhien, eac luc tuong tac rat nho nen khong dedang quan sat thay dupc Vi vay, viee chetao cac TNvesutuhoa cua eae ehat de su'dung day hpc (DH) eac kien thdc nham phat huy linh tich cue, nang Iyc sang tao eua HS va khic phyc sai lam cua HS la mot yeu cau cap thiet I C h e t a o T N m d h i n h mien t u hoa t u n h i e n cuachHtsatttf 1) Che tao TN md hinh mien tu hoi ttr nhien cua chai sat tlf Gh\m giaiy (1) dupc g i n vaomiJd6ng(2)va dupc dgt can b i n g tren mpt dinh (3) Cac dinh (3) dupc elm thing dung trSn mdl tam nhua, Hinh I TN mo hinh miin lir hod lumdi dinh each nhien cua chai sdi lu cm Hethong eac ghim giay (1), mu dong (2) va dinh (3) dupe d§l Irong mpt hop nhua (4) co mat tren la mica cho di ehuyen cac ghim giay khong bi roi khoi mu dong vadinh (ki2-4/2013)- H A DUYEN T U N G ' Moi mpt ghim giay dupc coi nhumpt mien tOrhoa tunhien cua chat s i t tir 2) Cic TN duqv tien hinh vdi TNmo hinh mien tu hoa tu nhien cua chatsittiyx\[\ khong cd tir Irudng ngoai, cac ghim giay dupc s i p xep hon ddn, khdng theo trat tu Sat he thong eac ghim giay d Iren i\i tardng ngoai cua nam cham vTnh cuu thi cacghim giay dat s i p xep lai theo hudng cua tirtn/dng ngoai Che tao TN Hinh TN ehung minh lir Ilnh ciia sdt bl mdl qua Chung minh t i i nhiet dg Quy-ri tinh cua s i t bjmat qua nhiet dp Quy-ri 1) Chetao TN ehung minh ti/ tinh cua sit bj mii ichi qui nhiet Ouy-dDoan s i l non (1) dupe UOTi moc trdn detreo vao giadd(2)vacdthedao dpng tren giadd (2) Nam cham vTnh cuu (3) dupc dat Iron phuong dao dpng cua doan s i t non cho doan s i t non bi hut ve phia nam cham nhung khdng tiep xucvdf nam cham Cay nen (4) dupc dat phia dudi doan s i t non bi nam cham hut Hethong doan s i t non, giadd, nam eham vacay nen dupc bo tri nhu hinh 2) Cic TN duac tien hinh vai TN ehung minh tutinhcuasitbjmiikhiquinhietdqQuy-ri.Qua doan sat non (1) lai gan phia nam cham vTnh cutj (3), ' TrVdne THPT Dan IQC noi tni tinh Thanh Hoa Tap chi Gide dye so 308 | 55 mat qua nhiet dp Quy-ri va TN ehung minh tinh ehat tiiuan tu, nghich tu, ehung toi tien hanh sopn thao tien trinh DH cac kien thtrc ve s u ti> hoa eua cac chat theo sffrfd'sau: Lim niy sinh w£n d( d n glal quy