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напишите в молекулярной и иконкой формах уравнения реакций между следующими веществами CA(OH)2 и NH4 Cl
Ответы 1
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Молекулярная форма:Ca(OH)2 + 2NH4Cl = CaCl2 + 2NH3 + 2H2OИонная форма:Полная Ca2+ + 2OH- + 2NH4+ + 2Cl- = Ca2+ + 2Cl- + 2NH3 + 2H2OСокращенная: 2OH- + 2NH4+ = 2NH3 + 2H2OСократим на 2 и будет: OH- + NH4+ = NH3 + H2O
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Автор:
silas995 - 6 лет назад
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The phonograph was invented quite by accident. In 1876 Thomas Edison moved to Menlo Park, New Jersey, where he established an industrial research laboratory. There Edison worked on a carbon telephone transmitter to improve the existing Bell system.
In that laboratory a year later Edison invented the phonograph while trying to improve a telegraph repeater.
He attached a telephone diaphragm to the needle in the telegraph repeater to produce a recording that could be played back. After some improvements to the machine he recited “Marry Had a Little Lamb” and played the recognizable reproduction of his voice back to the astonished audience.
____________
phonograph – фонограф
carbon transmitter – микрофон с угольным электродом
diaphragm – мембрана
I. Choose the title to the text.
1) Thomas Edison's research laboratory
2) Improvements in the Telephone and Telegraph
3) The history of Menlo Park
4) A Surprise Invention
II. Complete the statements according to the text.
1. File invention of the phonograph ...
I) was quite unplanned.
2) was Edison's principle project.
3) was surprising to no one. 4) took many years.
2. The phonograph was made ...
1) with a telephone needle and a recorder.
2) from only a telephone diaphragm.
3) with only a telegraph repeater.
4) from a combination of telephone and telegraph parts.
3. After Edison made improvements to the machine, he ...
1) made the reproduction of his voice recognizable.
2) used a carbon transmitter.
3) read a children's rhyme.
4) reproduced the audience's voice.
III. Find the sentence with the verb in the Past Indefinite Passive.
1) A year later Edison invented the phonograph while trying to improve a telegraph repeater.
2) There Edison worked on a carbon telephone transmitter to improve the existing Bell system.
3) The phonograph was invented quite by accident.
4) He recited “Many Had a Little Lamb”.
IV. Choose the synonym to tile underlined word.
He played the recognizable reproduction of his voice back to the astonished audience.
1) frightened
2) amazed
3) irritated
4) tired-
Предмет:
Английский язык -
Автор:
marshmallowyi92 - 6 лет назад
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Ответов:
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Charlie Chaplin
This is a story that Chaplin liked to tell about himself. It happened after the great actor had become world famous.
A theatre announced that a competition would be held to see who could act like Charlie Chaplin. Those taking part had to dress like Chaplin, walk like Chaplin and act one of the roles in a Chaplin film.
When Charlie Chaplin heard about the competition he decided, as a joke, to take part in the competition himself. Naturally, he kept his plan a secret from everybody.
When the results of the competition were announced Chaplin said: “1 didn't know whether to feel angry or only surprised. I didn't win the first prize. But after thinking about it, I decided that it would be best to laugh.”
I. Complete the statements according to the text.
1. This is a story which...
1) Chaplin was fond of telling.
2) is written by Chaplin's friend.
3) was announced at the competition.
4) happened before Chaplin had become world famous.
2. People who took part in the competition had to...
1) sing songs.
2) keep it a secret.
3) imitate Chaplin's manners.
4) dance.
3. When the results of the competition were announced Chaplin learnt that...
1) his new film was a success.
2) lie had won the first prize.
3) lie had not won the first prize.
4) he had won the second prize.
4. When Chaplin learnt the news lie decided...
1) to be angry.
2) to keep it a secret.
3) to tell everybody about it.
4) to laugh.
II. Find the wrong sentence.
1) Chaplin didn't take pail in the competition.
2) Chaplin didn't allow to hold this competition.
3) Chaplin didn't know about the competition.
4) Chaplin didn't tell anybody about his plans.
III. Choose the synonym to the underlined word.
Those taking part had to dress like Chaplin, walk like Chaplin and act one of the roles in a Chaplin film.
1) play
2) picture
3) cinema
4) performance-
Предмет:
Английский язык -
Автор:
jadagonzales - 6 лет назад
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Ответов:
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A few years ago I lost all my money in some business operations. So I decided to go to Lympne and write a play. This unwritten drama was my little reserve for a rainy day. This rainy day had come.
I got a cottage near the sea. The window at which I worked looked over the marsh, but the view on the marsh was beautiful. It was from this window that I first saw Mr. Cavor. He was a short man. He was gesticulating with his hands and often looked at his watch. This happened on my first day in Lympne. Next evening the man reappeared, and again the next evening and almost every evening when there was no rain.
On the fourteenth evening when he appeared I went to the place where he always stopped. “One moment, sir,” said I, “is it your time for exercises?” “Yes, it is. I come here to look at the t”. We talked a little, then wished each other good evening and both went our way.
(After H. G. Wells)
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marsh – болото
I. Complete the statements according to the text.
1. The author wanted to write a play because lie...
I ) needed money.
2) had nothing to do.
3) wanted to open some business.
4) wanted to become famous.
2. The author first saw Mr. Cavor...
I) when it was raining hard.
2) from the window of his study.
3) on his second day in Lympne.
4) when he was walking over the marsh.
3. The author first talked to Mr. Cavor...
1) two weeks later.
2) three days later.
3) after the sunrise.
4) the same day when lie saw him.
II. Choose the correct article.
After our first talk I knew little about Mr. Cavor. But I understood that he was ... serious man.
1) the 2) - 3) a 4) an
III. Choose the correct variant.
The author lost ... money in some business operations.
1) little 2) a little 3) many 4) much
IV. ‘For a rainy day’ means:
1) на случай дождя
2) на всякий случай
3) на черный день
4) на будущее-
Предмет:
Английский язык -
Автор:
arthurlove - 6 лет назад
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Ответов:
1 -
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One evening Mr. Cavor invited me to see his work and l went to his house. It was large and simply furnished. Mr. Cavor had no servants, there were only his three assistants who helped him in his work. But all the intellectual work was done by Mr. Cavor. The object of Mr. Cavor's research was a substance that had to be «opaque» to all forms of radiant energy. “Radiant energy”, he told me “is something like light, or heat, or Rontgen rays.” He thought he would be able to make such substance with the help of a new element which he had found.
Since that day we met almost every evening. Mr. Cavor lectured me on physics and I learnt a lot of interesting and unusual things.
His ideas interested me very much and I could not work at my play any longer. My head was busy with other things. I thought how to apply this substance to every branch of industry. Some days later I went to Mr. Cavor and told him that I wanted to be his fourth assistant.
substance – вещество
opaque – непроницаемый
rays – лучи
I. Complete the statements according to the text.
1. The author went to Mr. Cavor's laboratory because...
1) he wanted to know everything about Mr. Cavor's invention.
2) Mr. Cavor invited him.
3) he wanted to speak to Mr. Cavor about the play he was writing.
4) he wanted to write an article about Mr. Cavor.
2. Mr. Cavor's object of research work was...
1) a kind of radiant energy.
2) light, heat and Rontgen rays.
3) a new element.
4) a new substance.
3. Since the day of the author's visit to Mr. Cavor's laboratory...
1) the author got very interested in Mr. Cavor's invention and wanted to describe it in his play.
2) the author could not work at his play any longer.
3) Mr. Cavor asked him to become his fourth assistant.
4) they seldom met.
II. Choose the correct articles.
... possibilities of ... Substance opaque to heat and gravitation had no limits.
1) a, the 2) -, the 3) the, a 4) the, the
III. Change the sentence from Passive into Active:
All the intellectual work was done by Mr. Cavor.
1) Mr. Cavor had done all the intellectual work.
2) Mr. Cavor has done all the intellectual work.
3) Mr. Cavor did all the intellectual work.
4) Mr. Cavor was doing all the intellectual work.
IV. ‘To apply’ means:
1) to use 2) to sell 3) to offer 4) to examine
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Предмет:
Английский язык -
Автор:
semaj - 6 лет назад
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