Alkali Metals

The elements of the Periodic Group I A, lithium, sodium, potassium, rubidium and caesium are called the alkali metals. From the chemical point of view, they are the most active metals. The chemical activity of alkali metals is not identical and depends upon their atomic numbers. The alkali metals dissolve in liquid ammonia, forming dark-blue colloidal solutions. The alkali metals are too active to be found free in nature, they occur only as compounds. Sodium and potassium are among the most abundant elements in the world. These two elements are prepared commercially by the electrolysis. Humphry Davy, the famous English chemist of the 18^th century, was the first to prepare elemental potassium and sodium by electrolysis.

The alkali metals are usually stored in oil to exclude contact with air. When storing in this way, they usually do not have a metallic appearance because of a surface coating: They react with a number non-metals, forming binary products, e.g. with chlorine in form chlorides, with bromine to form bromides and with sulphur to form sulphides. The alkali metals are active metals to displace hydrogen from water, producing gaseous hydrogen and the hydroxide of the metal in solution. Potassium, rubidium and caesium develop enough heat in this reaction to ignite hydrogen. The alkali metals and their compounds find wide application in engineering.

Задание 2: Перепишите предложения, подчеркните в каждом инфинитив и укажите его функцию, т.е. определите, будет ли инфинитив подлежащим, обстоятельством, определением или частью составного именного сказуемого. Предложения переведите.

1. The task of the investigation was to obtain the optimal dosage and duration of treatment.

2. To get favourable results the treatment should be continued.

3. The dose to be administered is not exceed the stated dose.

4. To achieve good results in this experiment was a difficult task.

Задание 3: Перепишите предложения, подчеркните Participle I, укажите его функцию, т. е. определите, будет ли оно определением, обстоятельством или составной частью сказуемого.

1. This medicine is indicated to patients suffering from cough.

2. When combining chemically hydrogen and oxygen form water.

3. You should not take this drug if you are using other medicines.

Задание 4: Перепишите предложения; подчеркните глагол-сказуемое и определите его видовременную форму и залог; напишите форму инфинитива. Предложения переведите.

1. 1. Chemical methods of purifying water are becoming more and more important.

2. The question about the new laboratory will being discussed when we come at the meeting.

3. Now great attention is being given to the studying the properties of new drug.

4. When I came, he was testing the last sample.

5. I phoned him, he was finishing the last experiment.

Задание 5: Перепишите предложения, подчеркните глагол to do и определите, является ли он смысловым, вспомогательным или словом заместителем. Предложения переведите.

1. I do my work in the laboratory on Mondays.

2. Do you know the symptoms of this disease?

3. The student passed examinations as successfully as his friend did.

Задание 6: Выпишите предложения, где конструкции с глаголами to have, to be выражают долженствование, предложения переведите.

1. This question was discussed in a number of articles.

2. They are working at a very important experiment; it is to help our researchers to finish their work.

3. This drug is to be taken twice a day.

1. 4 .The ointment was used in pregnancy in a limited number of cases.

4. The patient has a running nose.

Задание 7: Перепишите предложения, подчеркните в каждом придаточное предложение; подчинительный союз или союзное слово обведите кружком; при бессоюзном подчинении укажите на место, где мог бы находиться опущенный союз. Предложения переведите.

1. Litmus has the property of changing colour according to the chemical properties of the solution it comes in contact with.

2. Bromine is one of the elements which must be handled with extreme care.

3. The elements cupric oxide is composed of are copper and oxygen.

4. We know that electricity is the form of motion.

Контрольная работа № 2

по английскому языку

для студентов I курса

фармацевтического факультета заочного отделения

ВАРИАНТ V

Задание 1: Прочитайте и письменно переведите текст на русский язык.