Andijon viloyati Baliqchi tumani 35-umumta’lim maktabining 9-“ ”sinf o‘quvchisi

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2- nazorat ishi

Mavzu: Uglerod guruhcha elementlari,uglerodning xossalari.Karbonat kislota. Kremniyning xossalari. Silikat kislota.

Nazorat shakli:Yozma ish.

1. Ohakli suv orqali uglerod(IV)-oksid mo’l o’tkazilganda, dastlab ohakli suv loyqalandi, so’ngra loyqalanish yo’qolib, tiniq eritma hosil bo’ladi. Bu o’zgarishlar natijasida sodir bo’lgan reaksiya tenglamasini yozing.

2. Uglerodning kimyoviy xossalarini namoyon qiluvchi reaksiya renglamalarini yozing.

3. 44,8 litr karbonat angidrid hosil qilish uchun (n.sh.) necha g kalsiy karbonatni parchalash kerak?

4. Quyidagi oksidlanish -qaytarilish reaksiya tenglamalariga koeffitsientlar tanlang va oksidlovchi va qaytaruvchini aniqlang.

a) С + H₂SO₄ = CO₂ + SO₂ + H₂O b) Si + NaOH = Na₄SiO₄ + H₂

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