1. Удельное сопротивление. От чего и как зависит сопротивление металлического проводника?

Напишите уравнения реакций и уравняйте пожалуйста!!!

Ca  -  CaCl2  -  Ca (OH)2  - Ca( NO3)2

 |                                    |

CaO                           Ca( PO4)2

(числа это индексы)              

Подчеркните глагол-сказуемое, определите видовременную форму и залог,укажите инфинитив ,от которого данная форма образована.

1. The exercise was written by the students. 2. The news will be of great interest.3 When I saw him, he was going home.4 The questions were being discussed for 3 hours. 5 The book will Ье given to me Ьу our teacher. 6. They had passed their exams by 3 o'clock yesterday. 7. New phenomena of nature are discovered by people due to electronic devices. 8. We shall be writing our tests at 10 o'clock. 9. A variety of tubes were invented by scientists for specialized functions.