-
Выведите формулу кислородсодержащего вещества, содержащего 40% углерода ,6,7% водорода и 53,3% кислорода. Относительная плотность паров этого вещества по водороду равна 30.
Ответы 1
-
Вещество может быть сложный эфир или кислота. Фото вещества С2Н4О2.
-
Автор:
jack58 - 4 года назад
-
0
-
-
Добавить свой ответ
Еще вопросы
-
напиши поздравление с днем рождения учителю, другу (подруге), бабушке или дедушке
-
Предмет:
Русский язык -
Автор:
monicaqonx - 4 года назад
-
Ответов:
1 -
Смотреть
-
-
В Восточной Сибири распол..жен..о уд..вительное озеро Байкал.
(В) него вт..кает 336 рек а выт..кает только одна Ангара. Это явление можно объяснить.
Вода выт..кает (по)самому глубокому руслу, а другие возможные истоки оказываются л..жащими выше уровня воды в озере.
Если озеро достаточно полноводное то из озера могут выт..кать и две реки.
Со временем река с более глубоким руслом в которой скорость т..чения большая будет размываться что повлечет увеличение ра(с,з)хода и пон..жение уровня воды в озере.
Сток воды через мелкую реку будет умен..шаться и она постепенно заилится.
Таким образом «выживает» только самая глубокая из выт..кающих рек.
Задания:
⦁ Выразительно прочитайте текст.
⦁ Озаглавьте текст, определите стиль и тип речи текста.
⦁ Вставьте пропущенные буквы, раскройте скобки, расставьте знаки препинания и объясните их постановку.
⦁ Разберите синтаксически предпоследнее предложение.
⦁ Разберите по составу слова: полноводное, удивительное.
⦁ Разберите морфологически слово: вытекает.
-
Предмет:
Русский язык -
Автор:
luna57 - 4 года назад
-
Ответов:
5 -
Смотреть
-
- в них откладываются в запас крахмал, масла и белок а) лейкопласты б) пластиды в) митохондрии г) поры
-
Ребяят! Помогите, пожалуйста! Прочитайте тексты и установите соответствие между текстами и их заголовками
1. To change the situation with foreign languages
2. Eating at school
3. Keeping fit at school
4. A break to stop and look around
5. Accepting foreign students to British schools
6. Gadgets in British schools
7. The enjoyable school event
8. To make them behave well
A.
All students in the UK have to do PE or Physical Education at school until they are 16. The schools offer different activities. The most popular sport is football which is played by boys and girls. Students also play rugby, field hockey, and netball or do individual physical activities like athletics or gymnastics. Today, some schools also offer dance, fitness, or frisbee. The school sports facilities are always available to the students at lunchtime and after classes.
B.
Unfortunately, this school subject is not very popular with British students. The British government is considering different ways to deal with this problem. One idea is to introduce foreign languages from the age of 5. Another plan is to give students more choice. The languages traditionally studied in British schools are French, Spanish and German. Now the government wants to include Arabic and Chinese in the school curriculum.
C.
Mobile phones are permitted at school in the UK but students are not allowed to use them in class. School students can use their phones at break time. Teachers can take away phones if these rules are broken. However, according to some teachers, students don’t always follow the rules. The lessons are sometimes disrupted when students send texts, receive calls, look at social networking sites or watch videos.
D.
School lunches are a hot topic in the UK these days. Some students have lunch at home or take a packed lunch to school but more than a third of British school pupils have lunch in the school canteen. There is usually a main course, a dessert and a drink. School dinners must include fruit and vegetables, protein (for example meat, fish or cheese) and carbohydrates (for example rice or pasta). Parents often pay for their children’s food in advance online.
E.
UK schools are allowed to discipline pupils who behave badly. The list of serious and not-so-serious types of bad behaviour may include: missing school without permission from parents, not doing homework, wearing unsuitable clothes for school, cheating in exams, bullying, etc. There are several ways students can be punished. Sometimes the student has to write a sentence, for example I must not shout in class, many times (for example, 100 times) on a sheet of paper.
F.
A school prom is a formal party to celebrate an important date such as the end of secondary school. The idea is to have fun with your school friends and celebrate your time and achievements at school. Proms are held in June or July, around the end of exam time or the end of term. A secondary school prom often involves a big party and nice dresses. Most schools arrange a special dinner in the school hall.
G.
In the past, students were only allowed to take a gap year (a period of time, when a student takes a break from formal education) if they had to retake exams or had health problems. But now universities positively encourage a gap year, and employers are happy to give jobs to students who take a gap year. They think that a gap year can give young people useful learning experiences, help them pick up new skills and make them more independent.-
Предмет:
Английский язык -
Автор:
cesar - 4 года назад
-
Ответов:
2 -
Смотреть
-
Топ пользователей
-
Fedoseewa27
35894 -
Askold
2792 -
Pikachu
2224 -
hobbesbowers
2116 -
kaylynnbarron676
1818 -
女fei
1240 -
yulia-kaplina
1156 -
Poinntt
946 -
Bars
930 -
Queenmagic18
754
How much to ban the user?
1 hour
1 day
100 years