При прохождении через проводник 40 Кл электричества током была совершена работа 200 Дж. Какое напряжение было приложено к этому проводнику?

Помогите:

1)Put ever, never or just in the right place in the sentences.

1.Has there been life on Mars? (ever)

2.We've seen a solar eclipse. (just)

3.I have learnt astronomy in my life. (never)

4.She isn't hungry - she has eaten lunch. (just)

5.Have you swum in a mountain lake? (ever)

2)Use the cues to write questions in the Present Perfect with ever.

Example:

Have you ever been to a planetarium?

1. a planetarium? (be to)

2. a science fiction story? (write)

3. a photo of the sky at night (take)

4. a journey into space? (dream of)

5. a UFO? (see)

6. anybody who has seen a UFO? (meet)

7. an alien? (talk to)

 плиз очень надо))  CH3OH+CO2-> 

Распределите вещества по классам: CuO, FeCl2, H2SiO3, BaCl2, NO, Cr(OH)2, Ba(OH)2, HBr, Al2(SO4)3 , Li2S. Классы: основные оксиды,кислотные оксиды,основания, кислоты,соли