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Пожалуйста, нужна помощь по химии.
Какие оксиды надо взять, чтобы получить соли: а) барий карбонат; б) феррум (III) фосфат?
Напишите уравнения соответствующих реакций.-
Предмет:
Химия -
Автор:
hot pepper - 5 лет назад
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Ответы 1
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1)BaO+CO2=BaCO32)K3PO4+FeCl3=FePO4+3KCl
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Автор:
víctorfyhd - 5 лет назад
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СРОЧНО ПРОШУ
choose and insert the correct word in the proper form.
Meal – food
Meal– act of eating
Food means that which can be eaten by people or animals, or used by plants, to keep them living and for growth
1. It was time to climb the hot, vineclad hill for the frugal midday … . 2. How many … a day do you have? 3. The English are said to prefer plain … . 4. ‘Let’s go and have our … at that restraint over there.’ ‘Yes, but do you think they serve good …?’ 5. In England lunch is usually the biggest … of the day. 6. When you go to India try some of their wonderful … .
Beach – bank – shore – coast
Beach – a flat area immediately next to the sea
Bank– land along each side of a river or canal: ground near a river
Shore– stretch of land bordering on the sea or a large body of water
Coast – land bordering the sea; seashore and land near it [the Coast – амер. Тихоокеанское побережье]
1. He used to spend the morning lying about the … with next to nothing on. 2. To the north and south the … is rock for the most part. 3. We could see the trees on the other … . 4. Gradually the oil stains were cleaned from the … 5. The center of the city is situated on the other … of the river. 6. Tourists go there to walk on the other … . 7. There was a protest against official plans to site a third London airport on the Essex … .
Learn – find out – discover
Learn – may mean ‘to be informed’ or ‘to receive information’ about sth, denotes getting information without any or much effort
Discover– suggests that the new information is surprising, unexpected
Find out – means ‘to get information by search or inquiry’, i.e. ‘making an effort to get it’
1. When he … that it was a form of rheumatism that made him unfit to further service his heart exulted. 2. When Salvatore went home he … that they all knew. 3. Mother was surprised to … that each member of the family had a different idea of education for Nick. 4. I was sorry to … that our hockey team again lost the game. 5. Give her a ring to … if she is at home. 6. I’ve just … that he had passed all the exams. 7. For a long time wee tried to … something about his past, but failed. 8. When Bell’s rivals … about his intention, they tried to claim their own rights to it. 9. Suddenly I … that I had left my note-book with her address in it behind.
Sick – ill
Sick– can be used in the expressions ‘to be sick’, which means ‘to bring up food from the stomach’ or ‘want to do this; in AmE ‘sick’ is normally used when you talk about bad health; in BrE ‘sick’ is used before a noun
Sick also can mean ‘very tired of’ – I am sick of your questions.
Ill– is used after a subject a verb
1. Here he fell … of some mysterious ailment. 2. They had been told by another of the island boys that he was … . 3. The child was … three times in the night. 4. The girl has been looking after her … father for eleven years. 5. Sorry I’ve missed all those classes: I’ve been … 6. The … child was finally taken to hospital. 7. He could hardly eat anything. The very thought of food made him … . 8. If you are …, you’d better stay home. 9. I’m … and tired of listening to your advice. 10. Why is she absent? Is she still …? 11. He is a very … man.
Own – owe
Own – means ‘possess; have as property’
Owe – means ‘to be in debt to sb (for sth)
1. His father was a fisherman who … his own little vineyard. 2. I … you an apology. 3. Who … this adorable little cottage? 4. Our tutor did a lot to cultivate our minds and we … him a debt of gratitude. 5. Why should one man … all that wealth? 6. He … his charm to his mother.
Used to/ would – be used to
Used to do smth – indicates a constant or frequent practice in the past, or, in the construction ‘there used to be’ the existence of sth in the past
To be used to – means ‘accustomed to’.
1. He … spend the morning lying about the beach. 2. He … throw himself into the deep water with a cry of delight. 3. He … silent paths and the mountains and the sea. 4. He … lie about the beach, smoking cigarettes. 5. Salvatore standing on a rock … dip them in the water. 6. he … seat the naked baby on the palm of his hand and hold him up. 7. he … bring his children down to give them a bath. 8. Before she was married she … attend all the concerts. 9. The child … waking up at night and screaming at the top of his voice. 10. She can’t … driving in the crowded streets of the city. 11. Soon he … living in the country and became a regular village boy. 12. Before the accident she … a beauty. 13. He … play tennis well in his young days. 14. He call on her once or twice a week.-
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