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

w(naoh) = m(naoh)/m(p-panaoh)

m(p-panaoh) = m(h2o) + m(naoh) = 1000 + 600 = 1600 г.

w(naoh) = 600/1600 = 0,375 или 37,5%.

mg + co2 = mgo + c

mg(0) - 2e = mg(2+)|4|2

c(+4) + 4e = c(0)      |2|1

2mg + co2 = 2mgo + c