Mustaqillik yillarida mamlakatimizda hukumatimiz tomonidan ta’lim sohasiga eng muhim vazifa sifatida e’tibor qaratib kelinayotgani sir emas. Bu sohada qator islohotlar qabul qilindi

Nazorat ishining bali _________

II variant

Tajriba: Anorganik moddalar orasidagi genetik bog'lanish.
Quyidagi o'zgarishlarni tajribalar asosida bajaring:
Cu → CuO →CuSO₄ →Cu(OH)₂ → CuO.
Mis plastinkasini spirt lampasi yordamida qizdiring, natijada plastinka qorayadi. Qoraygan qismini pichoq yordamida filtr qog'oziga qirib tushiring. Buni bir necha bor takrorlang. Hosil bo'lgan mis (ll)-oksidini toza probirkaga^olib, ustiga 1-2 ml sulfat kislota eritmasidan quying. Reaksiyani tezlatish maqsadida probirkani tutqichda ushlab, spirt lampasi yordamida qizdiring. Hosil bo'lgan havorang eritmaga nartiy gidrooksid eritmasidan 1-2 ml quying, natijada havo rangli mis (II) gidrooksid cho'kmasi hosil bo'ladi. Cho'kmani filtr qog'ozi yordamida filtrlang va ozgina quritib, chinni kosachaga solib, spirt lampasi yordamida qizdiring. Nima kuzatiladi? Tajriba xulosalarini va s'odir bo'lgan reaksiya tenglamalarini daftaringizga yozing.
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