3. :
1. In 1745 Lomonosov (was appointed, appointed) a professor at the Academy of Sciences.
2. The first electric lamp (was invented, invented) in 1873 by A. N. Lodygin.
3. In 1911 Marie Curie (was received, received) the Nobel Prize in Chemistry.
4. , :
1. Lomonosov considered chemistry to be his "main profession".
2. The air is known to be a mixture of gases.
3. Lomonosov is considered to be a great Russian scientist.
5. :
1. Lomonosov began to work at an early age.
2. Edison founded an electric company to supply electricity to New York and other places.
3. The experiment to be made by this scientist will give us important information.
6. - , :
1. They must solve a number of scientific problems.
2. She can do this work in time.
3. You may use this method in your research.
7. some, any, no:
1. There were (some, any, no) other higher schools at that time in Russia.
2. Can you give me (some, any, no) magazines?
3. They carried out (some, any, no) experiments yesterday.
8.
a) . , :
Electricity is made in many ways. One way is a battery, as used in a transistor radio. A simple battery has a positive terminal, connected to a carbon rod. The carbon rod is placed in a chemical paste inside a zinc container.
Any material which will allow electricity to flow through it is called a conductor. Most metals are good conductors.
A simple battery converts, or changes, chemical energy into electrical energy. Other forms of energy, such as heat and light, may be converted into electricity. The most common way of making electricity is by the conversion of mechanical energy.
) :
1. If the petrol tank is empty, pour (some, any, no) petrol into it.
2. There was (some, any, no) water in the radiator, so we had to refill it. 3. This mechanic can repair (some, any, no) type of engine.
) , - .
) :
1. What is a conductor?
2. Are metals good conductors?
3. What forms of energy can be converted into electricity?
4
1. :
1. What did Mendeleev discover?
2. What fields of science do his works embrace?
DMITRY MENDELEEV
I.D.I. Mendeleev was born in 1834 at Tobolsk in the family of the director of the town gymnasium. He received his secondary education at Tobolsk and then entered the Petersburg Pedagogical Institute. After graduation he worked as a teacher for two years.
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2. In 1859 he presented his thesis, received his master's degree am went abroad on a two-year scientific commission. Upon his return tc Russia he was elected professor of the Petersburg University, where carried on his scientific and pedagogical activity for 23 years.
3. In 1906 he issued a book under the title Contribution to the Knowledge of Russia which contained thoughts of the further development of Russian industry and economy. The greatest result of Mendeleev'; creative effort was the discovery of the Periodic Table of Elements.
4. One of Mendeleev's prominent works is his book Principles Chemistry in which inorganic chemistry was for the first time explained from the standpoint of the Periodic Law.
5. A great scientist, Mendeleev devoted his life and energies to the! progress of his country. His works embrace various fields of! science chemistry, physics, physical chemistry, geophysics.
