+7 (727)
344 95 95
Please email us
English
Русский
Қазақша
Subscribe
Profile
Subscription
Balance
Watch history
My library
Notifications
My contests
Поурочные планы
Logout
Русский
Қазақша
Online Mektep
Authorization
Home
Subjects
Contests
Subscribe
Chemistry course
Main
Courses on International standards
Chemistry course
Inorganic Chemistry
Nonmetals
Nonmetals
Properties of water
Colloids
Hardness of Water. Water Pollution
Dissolution. Solubility in water
Water
Solutions. Solubility
Concentrations of Solutions
