Предмет: Химия, автор: Аноним

СРОЧНО!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Сделать характеристику элемента лития

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Автор ответа: inna7336
0

Ответ:

Литий — самый легкий из металлов. Имеет плотность 0,534 г/см³. Плавится при температуре 180,5 °С, кипит при температуре 1330 °С. Литий очень активен.

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UKRAINIANS IN SPACE ENGINEERING



Speaking about the development of rocket and space engineering in the former USSR, the world usually connects this with the name of Academician Serhii Koroliov, an outstanding creator of the practical space engineering. Many people regard him as a representative of the Russian people. However, Serhii Koroliov is a Ukrainian. He himself attested his belonging to the Ukrainian people when he filled in a form while entering the Kyiv Polytechnic.

Serhii Koroliov, who was born in the city of Zhytomyr, is one of the most outstanding Ukrainians whose name will go down in history of the world civilization.

But his titanic deeds were possible owing to accurate and well coordinated work of numerous organizations. And some of them were headed by our compatriots.

Mykhailo Yangel, Volodymyr Chelomei, Valentyn Hlushko should be mentioned here.

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Volodymyr Chelomei headed the creation of the carrier rockets.

Speaking about Ukrainians' contribution into creation of rocket and space technology we should remember about scientific basis they used. This basis was created, in part, as early as in the 19th century by our compatriots. They were Olexan-der Zasiadko (1779-1834), Kostiantyn Kostiantynov (born in 1817 or 1818), Mykola Kybalchych, who died at the age of 28, Kostiantyn Tsiolkovskyi, who came from the glorious Cossack family of Nalyvaiko, Yurii Kondratiuk, who made calculations for the manned flight to the Moon. Americans used these calculations in 1969 when they sent their astronauts to this satellite.

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