Может ли реакция обмена идти между двумя нерастворимыми веществами и почему?

ответ:

3.

1) no we aren`t

2) yes he does

3)yes she has

4) no i don`t

5)no it hasen`t

6) yes they are

объяснение:

1) are we friends? no, we aren`t

2) does petros have a close friends? yes, petros have a close friends

3)has she got the cat? yes, she has got the cat

4)do you have a sister? no, i haven`t

5) has it got a name? no it hasn`t

1) m(hcl)=400*30%=120г

2hcl     +   zn=   zncl₂   +   h₂

m=36,5             m=136

m=73                 m=136

x=120*136/73=223,6