Surxondaryo viloyati boysun tumani 7-umumta’lim maktabining – “A
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7-sinf Kimyo fanidan nazorat ishi daftari 2022-2023
Nazorat shakli: Yozma ish.
1.Quyidagi formulalarni valentlik asosida tuzing : II CuO III CrO VII ClO AlO I HgO KO III NH IVCO II H S VI SO 2. Xlorning valentligi besh ekanligini bilgan holda uning kislorod bilan hosil qilgan birikmasining formulasini yozing. 3. Quyidagi moddalarning proton,neytron va elektronlarini aniqlang: a) NH3 b) O2 c) Si D) CO2 4. 88Sr izotopi atomining yadrosini necha foizi neytronlardan iborat. 5. Xlorningvalentligibir, kislorodningvalentligiikkiekanliginibilganholdaformulalari FeCl2, AlCl3, LiCl, K2O, MgO, Cr2O3, CrO3, CrO, Mn2O7, MnO2bo‘lganbirikmalardagiikkinchielementlarningvalentliginianiqlang. .______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________.__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________.____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Sana Ball Imzo Download 2.47 Mb. Do'stlaringiz bilan baham: |
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