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Предложите не менее четырёх способов классификации оксидов по разным признакам. Какой признак классификации наиболее важен для химика?
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Предмет:
Химия -
Автор:
segismundofrancis - 6 лет назад
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Ответы 1
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Могу предположить: кислотные, амфотерные, основные.
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Автор:
catalinaul6r - 6 лет назад
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Прочитайте текст и ответьте на следующие за ним вопросы, обведя номер правильного ответа кружком.
Sally had been studying at a design college for a year and, like most students, she did not have much money. It was going to be her mother's birthday soon, and she wanted to buy her a present that would be nice and useful but not too expensive.
Sally's college was in London, but she had been living in the country for many years, so every day she had an hour's journey by train in the morning, and the same in the evening.
At lunch time one day, a week before her mother's birthday, she decided to have a quick sandwich and a cup of coffee instead of her usual meal in the college hall, and then go shopping near her college to buy her mother a nice present. When she had been looking for half an hour, she came across a shop that was selling umbrellas cheap, and decided that an umbrella would be a nice present, since her mother had lost hers the month before.
'Now which colour shall I choose?' she thought. 'Well, I think a black one would be the most useful. You can carry that when you are wearing clothes of any colour, can't you?' So having made up her mind, she bought a lovely black umbrella and took it back to the college with her until her classes had finished.
On her way back home in the train that evening she felt hungry so she went to the buffet car for another sandwich and a cup of coffee. She had left the black umbrella above her seat in the compartment, but when she got back, it had gone! When she had left the compartment, there had been no other passengers in it, but now there were three.
Sally burst into tears when she saw that the umbrella was no longer there. The other passengers felt very sorry for her and asked what the matter was. When she explained that the black umbrella she had bought for her mother had disappeared, and that she had to get out at the next station, the three other passengers asked her for her mother's address, in order to be able to send the umbrella on to her in case someone had taken it by mistake and not on purpose, and brought it back after Sally had got out of the train.
The next week Sally heard from her mother. Her letter said, 'Thank you very much for your lovely presents, but why did you send me three black umbrellas?'
1. WHY DID SALLY THINK THAT AN UMBRELLA WOULD BE A GOOD PRESENT FOR HER MOTHER?
A She was short of money and couldn't afford to buy anything but a cheap umbrella.
В Her mother had asked her to buy a good umbrella as she had lost hers.
С Her idea of a good present was something useful at a reasonable price.
D There was nothing else to buy in the shop where she had come.
2. WHAT INFLUENCED HER DECISION TO CHOOSE A BLACK UMBRELLA?
A It matched any clothes.
В Her mother's favourite colour was black.
С It was a very practical colour and you could not see dirt on it.
D There were no other colours available in the shop.
3. WHAT HAPPENED TO SALLY'S UMBRELLA?
A It had been stolen by someone.
B We can't say anything for sure.
C It had been taken by someone by mistake.
D The conductor might have found it and given it to the Lost Property Office.
4. WHY DID SALLY'S FELLOW-PASSENGERS WANT TO KNOW HER MOTHER'S ADDRESS?
A They liked Sally and promised to send her an umbrella instead of the missing one.
B It was just a display of politeness.
С They wanted to send it to Sally's mother in case it was found.
D They decided to pay Sally's mother a visit and congratulate her on her birthday.
5. WHAT INFORMATION IS MISSING FROM THE TEXT?
A Sally's occupation.
В The names of the senders of three umbrellas.
С The food Sally had eaten in the buffet car.
D The place where Sally had bought her umbrella.-
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