Samarqand viloyati payariq tumani maktabning sinf o’quvchisi
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8-sinf nazorat ishi
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SAMARQAND VILOYATI PAYARIQ TUMANI _____________ MAKTABNING _____-SINF O’QUVCHISI _______________________________NING KIMYO FANIDAN NAZORAT ISHI Sana______________ Nazorat ishi-1 1. Kislorod atomining absolut massasi 2,657*10-23 grammga teng. Uning nisbiy atom massasini aniqlang._____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ 2. Xromning ikki, uch va olti valentli kislorodli birikmalari ma’lum. Xromning ana shu oksidlarini formulalarini yozing. ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ 3. 12,5 mol mis(II)-oksidining massasini hisoblang. ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ 4. Olmaliq kon metallurgiya kombinatida qayta ishlanadigan ruda tarkibida 49,6 % marganes va 50,4 % kislorod bo’lgan oksid mavjud. Ushbu oksidning formulasini keltirib chiqaring. ______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ 5. Tarkibida 49 gr sulfat kislota bo’lgan eritmaga 20 g natriy gidroksid ta’sir ettirildi. Hosil bo’lgan tuzning nomini va massasini aniqlang. ______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Baho____________ Download 113,73 Kb. Do'stlaringiz bilan baham: 
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