Shofirkon tuman 1- umumiy o’rta ta’lim maktabining – “ ” sinf o`quvchisi

Sana: _________________
3-Nazorat ishi
Mavzu:Metallmaslar.Uglerod guruhi.
Nazorat shakli:masala yechish.
I-variant
1. Quyidagi o’zgarishlarni amalga oshiruvchi reaksiya tenglamalarini yozing.
CaCO₃→CO₂→Na₂CO₃→NaCO₃→NaCl
2.Uglerodni jami elektronlarini necha %ini s elektronlari tashkil etadi?
3.Tarkibida 20% qo’shimcha modda bo’lgan 10gr ohaktosh to’liq parchalanganda (n.sh.da) necha l gaz ajraladi?
Kompetentlikni aniqlash uchun materiallar:
4.Ohaktoshdagi elementlarni % nisbatlarini aniqlang.Eng ko’p uchraydigan kremniyning birikmasi qaysi? Unda kremniy necha % ni tashkil etadi?
5.siz uglerodni qanday birikmalari haqida ko’p eshitgansiz 3ta birikmasi haqida tushunchalaringizni bayon eting.?
II-variant.
1.25gr ohaktosh qizdirilganda 10gr kalsiy oksidi olindi.Ohaktosh tarkibida necha %CaCO₃ bo’lgan?
2. Quyidagi o’zgarishlarni amalga oshiruvchi reaksiya tenglamalarini yozing.
CaCO₃→CaO→Ca(OH)₂→CaCl₂→ CaCO₃
3.11,2l(n.sh)da is gazi yonganda qancha miqdor issiqlik ajralib chiqadi?
Kompetentlikni aniqlash uchun materiallar:
4.Ohaktosh haqida nimalarni bilasiz?
5. Dolomitdagi elementlarni massa nisbatini aniqlang.
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