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

6	7	8	9	10	11	12	13	14
15
O’quvchining javoblari.
O’qituvchining belgilari

Nazorat ishining bali _________
2 - Nazorat ishi
Mavzu: Uglerod guruhi elementlari, uglerodning xossalari, karbonat kislota, kremniyning xossalari, silikat sanoati.
Nazorat shakli: Yozma ish.
I variant
1. Ohakli suv orqali uglerod (IV)-oksid mo'l o‘tkazilganda, dastlab ohakli suv loyqalanadi, so‘ngra loyqalanish yo‘qolib, tiniq eritma hosil bo‘ladi. Bu o‘zgarishlar natijasida sodir bo'lgan reaksiya tenglamalarni yozing.
2. Uglerodning kimyoviy xossalarini namoyon qiluvchi reaksiya tenglamalarini yozing.
3. 44.8 litr karbonat angidrid hosil qilish uchun (n.sh.) necha g kalsiy karbonati parcchalash lozim?
4. Quyidagi oksidlanish-qaytarilish reaksiya tenglamalariga koeffitsiyentlar tanlang va oksidlovchi hamda qaytaruvchini aniqlang.
A) C+H₂SO₄ = CO₂ + SO₂ + H₂O;
B) Si + NaOH = Na₄SiO₄ + H₂.
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