1) Запишите уравнения хлорида кальция в молекулярной и ионной формах.

2) осуществите превращения и запишите уравнения реакций в молекулярной и ионной формах  Fe → FeCl2 → FeCl3

3) Уравнения реакций сульфата железа(II) запишите в ионной и молекулярной формах.

пирамида потребностей робинзона крузо

эссе на тему болота главное богатство России

Если формула n-ого члена числовой последовательности имеет вид Xn=(n+2)/(n^2-4),  то X5=

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