Предмет: Химия, автор: ivanova71

Назовите химический элемент,в атоме которого электроны распологаются по уровням согласно ряду чисел
2,5
Какое простое вещество образует этот элемент? Какую формулу имеет высшийоксид этого элемента какой его характер?запишите уравнения реакций,характеризующих свойства этого оксида.

Ответы

Автор ответа: Аноним
0
Это азот (2e, 5e)
Простое вещество - азот (N2)
Высший оксид N2O5 (кислотный характер)
N2O5 + 2NaOH = 2NaNO3 + H2O
Автор ответа: Радость25
0
решение смотри во вложении:
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I Study at the Institute I study at an art (technical)Institute. The academic year be- gins, as a rule, on the 1st of September and ends in June. It lasts ten months: September, October, November, December, January, February, March, April, May and June. The academic vear has two terms: the autumn term and the spring term. The autumn term begins in September and ends in December. It lasts about four months. The spring term begins on the 7th of Febru- ary and ends as a rule in May. This term is short. It lasts only three months. Each term ends with examinations which take place in January and in June. During the academic year stu- dents work hard. As a rule they are very busy and have a lot of work to do. We have two holidays a year: winter holidays and summer holidays. The summer holidays are long. They last two months. The winter holidays are short. They last only two weeks. During the holidays we do not study, we have a rest. We go to the Institute every day except Sunday. On week- days we work hard. On Sunday we have a rest as a rule. Classes at our Institute begin at nine o'clock in the morning and end at half past three in the afternoon. All students learn some foreign language man or French. We learn English, We have two English classes a week, on Tuesdays and on Fridays. On Tuesday we have our En- glish class in the morning, on Friday in the afternoon. When the teacher comes into the room we stand up and greet the teacher. We say: "Good morning" if it is morning. We say: "Good after- noon" if it is afternoon. We say: "Good evening" if it is evening. Then we sit down and our lesson begins. We check our home- work. We ask and answer questions, we read English texts and translate sentences from Russian into English, or from English into Russian. We describe pictures and speak on various topics. During the English class we do a lot of exercises, we speak, read and write English. We do not speak Russian in class. We speak Russian before and after classes. As I want to learn to speak and to read English, I am very attentive in class and I always prepare my homework. English is not difficult for me because I work at it regularly. As I live in the hostel, I always prepare my lessons together with a friend of mine. We learn new words and do exercises. We ask each other questions and answer them. We also listen to the recorded tapes in the English language laboratory of our Institute. We are fond of English and we want to master it, that's why we never miss classes and work hard. At the end of each class the teacher gives us our homework. She says: "The homework for your next English class is to read the new text, to learn the new words and to prepare the topic 'My Institute'. I also want you to listen to the tape in our laboratory. This time take Tape Eight, please. Our next English class is on Friday at twenty minutes to twelve. Don't be late. Good-bye."