В уравнении окислительно - восстановительной реакции, схема которой Н2S + Cl2 → S + HCl, сера является

Выберите один ответ:

a. восстановителем

b. сера в этой ОВР не является ни окислителем, ни восстановителем

c. и восстановителем, и окислителем

d. окислителем

Напишите уравнения реакций,с помощью которых можно осуществить следующие превращения:

Li->LiOH

Помогите пожалуйста, очень срочно!!

Task 1. Complete each sentence with one of the words and phrases below (7 points).
books, other things, inventions, communicate, CDs, all parts of the country, information
Radio, television and the Internet are the great 1) … of the 20th century. In 2) … there are many papers giving information about films, concerts and 3) … that are happening in the local area. These days you can read books on 4) … . In the Internet you can find any 5) … you want. Also you can 6) … with your friends there. But I think that 7) … are forever.  
Task 2. The word in capitals in the right column can be used to form a word that fits suitably in the blank space. Fill each blank in this way (3 points).
1.    Reading CD books you can see what’s happening in … .    ACT
2.    She … everything to the police.    EXPLAIN
3.    The famous … collected the most interesting material in the South Africa.    REPORT
Task 3. Complete the sentences. Choose the correct variant (5 points).
1.    The (new/ news) is shocking.
2.    The (new/ news) film is shocking.
3.    I have some (money/ moneys) in my pocket.
4.    We have much (snow/ snows) in winter.
5.    Her (hair/ hairs) is beautiful.
Task 4. Complete the sentences (5 points).
1.    He agreed (to help/ helping) us with Physics.
2.    We are fond of (to fish/ fishing).
3.    His Dictionary was proved (to be/ being) useful.
4.    He finished (written/ writing) the letter.
5.    Children decided (to buy/ buying) the present for their teacher.
Task 5. Write the following statements in reported speech (6 points).
1.    She says: “I saw you in the cinema”.
2.    He said: “Helen left yesterday”.
3.    My friend asked: “How long have you been here?”
4.    She said to Richard: “Water the flowers”.
5.    Mother said to the children: “Don’t touch the cat”.
6.    The teacher asked: “Did you write your homework?”

4 предложения с причастными и деепричастными оборотами

В прямоугольном треугольнике ABC (угол С = 90 градусов), АС=5 см, ВС = 5 корней из 3. Найти АВ, sin угла В