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массовые доли углерода и водорода соответственно равны 88,23% и 11,76%. плотность этого углерода составляет 3,04 г/л. определите формулу непредельного углеводорода
Ответы 1
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Если формула p=M/Vm M(в-аа)=3,04*22,4=68С5h8
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Автор:
alvaroi8af - 2 года назад
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10
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There are 46 universities in Britain.
For all British citizens a place at university brings with it a grant from their Local Education authority. The grants cover tuition fees and some -of the living expenses. The amount depends on the parents' income. If the parents do not earn much money, their children will receive a full grand (1) which will cover all their expenses.
Most 18 and 19 year-olds in Britain are fairly independent people, and when the time comes to pick a college they usually choose one as far away from home as possible! So, many students in northern and Scottish universities come from the south of England and vice versa. It is very unusual for university students to live at home. Although parents may be a little sad to see this happen, they usually approve of the move, and see it as a necessary part of becoming an adult. Anyway, the three university terms are only ten weeks each, and during vacation times families are reunited.
When they first arrive at college, first year university students are called 'freshers'. A fresher's life can be exciting but terrifying for the first week.
Often freshers will live in a Hall of Residence on or near the college campus, although they may move out into a rented room (2) in their second or third year, or share a house with friends. Many freshers will feel very homesick for the first week or so. But living in hall soon helps them to make new friends.
During the first week, all the clubs and societies hold a 'freshers'fair' (3) during which they try to persuade the new students to join their society The freshers are told that it is important for them to come into contact with many opinions and activities during their time at university, but the choice can be a bit overwhelming!
On the day that lectures start, groups of freshers are often seen walking around huge campuses, maps in hand and a worried look on their faces. They are learning how difficult it is to change from a school community to one of many thousands. They also learn a new way of studying. As well as lectures, there are regular seminars, at which one of a small group of students (probably not more than ten) reads a paper he or she has written. The paper is then discussed by the tutor and the rest of the group. Once or twice a term, students will have a tutorial. This means that they see a tutor alone to discuss their work (4) and their progress. In Oxford and Cambridge, and some other universities, the study system is based entirely around such tutorials which take place once a week. Attending lectures is optional for all students.
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1. How many universities are there in Britain?
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4. How are the first-year students called? What do you think why it is so?
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