Card 5 1) Are there any charity events that your school holds?

2)What kind of charity events would you organize?

3)Do you think that one day there will be no need for charities?

4)Do you agree with the expression "charity begins at home"? ​

Ответ:

Calculate the mass of the precipitate that will be formed as a result of the action of a sufficient amount of argentum nitrate on 222 g of calcium chloride solution with a mass fraction of 10%. As a result of the substitution reaction, the following are formed: A) two complex substances; B) one complex substance and C) simple and complex substance; D) several simple and complex substances.