Предмет: Математика, автор: Anastaciabloomcom145

В 1 кг морской воды содержится 40 г соли. Сколько соли содержится в 650 г морской воды?
Решите пропорцией

Ответы

Автор ответа: TomasSmZRs
1
650 г = 0,65 кг

1 – 40
0,65 – x

x = (0,65×40) / 1 = 26 г

Ответ : В 650 г морской воды содержится 26 г соли.
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The word «pharmacy» comes from Greek and in the modem lan­guage means «a
drug». The civilization of the past contributed to our present knowledge by the
collection of drugs and medicinal prepara­tions. Pharmacy was an integral part
of medicine when preparative pharmaceutical techniques were simple. It became
an independent branch of medicine when an increasing variety of drugs and their
com­plex compositions demanded specialists familiar with such technologies.

However, only in the late eighteenth and nineteenth centuries chemical
knowledge advanced to the point at which it became capa­ble to contribute
significantly to pharmacology. The first and the most important was the
isolation in relatively pure chemical form of the active constituents of
plants. For example, in 1806 Sertumer iso­lated morphine from opium. It took
man over five thousand years to make this very important step.

The industrial revolution of the last century gave birth to syn­thetic
organic chemistry and established a new branch of knowledge necessary for the
synthesis of new drugs. At present pharmacy is de­fined as the art and science
of recognition, identification, collection, preparation, storage, test,
composition and distribution of all sub­stances used in preventive or in
curative medicine for people’s treat­ment. It includes different subjects, such
as physics, chemistry, bot­any, pharmacognosy, pharmacology, etc. which
pharmaceutical stu­dents master to become highly qualified pharmaceutists.

1. When did chemical knowledge advance to contribute
signifi­cantly to pharmacology?

2. What did the industrial revolution do?

3. How is pharmacy defined at present?

4. Which contribution was the isolation of the
active constituents?

5. Why do pharmaceutical students master so many
subjects?

6. When did pharmacy become an independent branch of
medicine?

7. How long did it take man to make this very
important step?

8. Where does the word «pharmacy» come from?

9. What specialists did an increasing variety of
drugs demand?

10. Who contributed to our present knowledge of
pharmacy?
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