Mavzu: modda va uning xossalari

III. Etil spirti, sirka kislotaning ( 5% li eritmasi), bug'Iarini hidlash yo'li
bilan farqlash.

1. 
   Ikki dona quruq probirka olib 1-probirkaga 1 ml etil spirti.
   
2. 
   Probirkaga 1 ml sirka kislotaning suyultirilgan eritmasi solinadi.
   
3. 
   Ehtiyotkorlik bilan ohista hidlab ko'riladi. Etil spirtining o'ziga xos hidi seziladi.
   
4. 
   2-probirka ham ehtiyotlik bilan hidlab ko'riladi. Sirka kislotasining ham o'ziga xos hidga ega ekanligini bilish mumkin.
   
5. 
   Kuzatilgan hodisalar izohlanadi va daftarga yoziladi.
   

Nazorat uchun savollar:

1. 
   Fizik hodisalar deb nimaga aytiladi?
   
2. 
   Fizik hodisalarda moddaning agregat holati o'zgarishiga misollar ayting.
   
3. 
   Erituvchi suv bo'lganda turli agregat holatdagi moddalarning suvda erishida qanday o'zgarishlar kuzatiladi?
   

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