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Nazorat ishi №2
Mavzu: Uglerod guruhcha elementlari,uglerodning xossalari
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. 44,8 litr karbonat angidrid hosil qilish uchun (n.sh.) necha g kalsiy karbonatni parchalash kerak?
3.Uglerodning kimyoviy xossalarini reaksiya renglamalarini yozing.
Kompitentlikni aniqlash uchun materiallar:
4.Oxaktoshning xo’jalikda ishlatilishi haqida yozing.
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Sana
Amaliy ish №1
Mavzu: Uglerod (IV)-oksidi olish va uning xossalari bilan tanishish.
Darsning maqsadi:
-Uglerod (IV)- oksid hosil qilish va uning xossalari bilan tanishish;
Kerakli jihozlar va reaktivlar: probirkalar, gaz o’tkazgich nayli tiqin, shtativ tarozi toshlari bilan, filtr qog’ozi, elektr qizdirgich, bo’r, marmar yoki ohaktosh bo’laklari (СаСОз), suyultirilgan xlorid kislota (HC1), ohakli suv (Ca(OH)2), distillangan suv, ko’k lakmus eritmasi, suyultirilgan o’yuvchi natriy (NaOH), fenolftalein eritmasi, tuproq namunasi, kumush nitrat eritmasi (AgNO3).
Ishning borishi:
1. Probirkaga bo‘r yoki marmardan bir necha bo‘lak soling va suyultirilgan xlorid kislotadan ozgina quying.
2. Probirka og‘zini gaz o‘tkazgich nayli tiqin bilan berkiting.
3. Nayning uchini 2—3 ml ohakli suv quyilgan probirkaga tushiring va sodir bo‘layotgan hodisani kuzating.
4. Gaz o‘tkazgich nayni distillangan suv quyilgan eritmaga tushiring. Gazning distillangan suvdan o‘tishi 1—2 minut davom etsin. Nayni chiqarib olib, olingan eritmaga bir necha tomchi ko‘k lakmus eritmasidan tomizing.
5. Probirkaga suyultiri lgan o‘yuvchi natriy eritmasidan 2—3 ml quying va unga bir necha tomchi fenolftalein qo‘shing. So‘ngra eritma orqali gaz o‘tkazing.
6. 10 g tuproq namunasidan olib, suv bilan aralashtiring. Aralashmani filtrlab, probirkaga quying: a) tuproqdan 2—3 g probirkaga soling va ustiga suyultirilgan
xlorid kislota quying.
Nima kuzatiladi?
b) yuqorida olingan filtratga kumush nitratdan ozgina quying. Hosil bo‘lgan oq rangli cho‘kmani filtrlab oling. Cho‘kmani ikkiga bo‘lib, 1- qismiga ammiak yoki suyultirilgan xlorid kislota quying, 2- qismini qizdiring.
Nima kuzatiladi?
Topshiriqlar :
1. Yuqorida bajari lgan tajribalardagi barcha reaksiyalar tenglamalarini yozing.
2. Bajarilgan tajribalar yuzasidan xulosa
Xulosa:____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
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