Translate and memorize the following words. UNIT IV The Study of Chemistry and Its Branches

UNIT IV The Study of Chemistry and Its Branches

Grammar: Past Simple Tense

Text: Chemistry

science	react	matter
crystal	compose	ancient
property	accompany	sufficient
structure	undergo	quantitative
catalysis	develop	external
field	introduce	equal
branch	state	regular
concept	discover	homogeneous
theory	take place	heterogeneous
volume	create	thorough
pressure	deal with	artificial

2. Pay attention to the reading of the following words:

material, magic, quantitatively, undergo, relationship, composition, condition, concept, accompany, molecule, colour, fundamental, among, important, hydrogen, biochemistry, radium, geology, create, origin, machine, manufacture, ceramics, polymer, liquid, century, homogeneous, heterogeneous, alloy.

3. Read the following words and define the parts of speech. Mind the stress:

chemistry – chemist – chemical - chemicals; transform – transformation; nature – natural; practice – practical – practically; understand – understandable; homogeneous – homogenity; equal – equality; external – internal; quantity – quantitatively; regular – regularly – regularity; origin – original – originally; art – artificial – artificially; structure – structural.

Study and remember the following chart:

We attended all the lectures last month.	You did not/didn’t attend last lecture.	Didthey attend last lecture?
He gave the lectures in colloidal chemistry that time.	He didn’t give lectures in organic chemistry that time.	Did he give lectures in organic chemistry that time?

Use the Past Simple Tense if an action took place:

- yesterday, last week(month, year, etc.),

- some days(minutes, hours, etc.) ago, the other day, in 2000.

- or didn’t take place that time.

4. Ask the questions according to the model:

Model: He visited our lab yesterday. – Did he visit our lab yesterday?

Who visit ed our lab yesterday?

When didhe visit our lab?

1. He answered all the questions last presentation. 2. We gave you all the information yesterday. 3. They left the Institute some minutes ago. 4. In the 19^th century A. Avogardo introduced the concept of molecules. 5. In 1869 D.I. Mendeleyev systematized elements. 6. I didn’t go to the University last week. 7. Last century A.M. Butlerov introduced the structural theory of organic chemistry.

5. Complete the following sentences according to the model. Use the Past Indefinite Tense:

Model: He studies organic chemistry but last year he studied inorganic chemistry.

1. The students come to the Institute at 9 but last year they... at half past nine. 2. She carries experiments herself but some time ago she... them under the teacher's supervision. 3. He works at the Research Institute but two years ago he... at the plant. 4. They speak English rather well but last year they... poorly.

6. Open the brackets choosing the correct form of the verb:

1. Last year he (dealed/dealt/deals) with quantitative analysis. 2. We (didn’t studied/didn’t study) organics that semester. 3. Two years ago my groupmate (studied/studyed/ was studied) the problems of crystal chemistry. 4. Everybody (understand/understood/ understands) the importance of this theory. 5. When they (heated/ heat) the substance to 48°C it (begun/ began/ begined) to boil. 6. She (passes/passed) her entrance exams well and now she (has a rest/ had a rest/ have a rest).

7. Translate the following sentences into Russian:

Note: present — данный; настоящий; присутствующий

at present — в настоящее время

to be present — присутствовать

to present — представлять

1. When his experimental work was ready he presented it to his professor. 2. At present potassium nitrite is manufactured widely at the plants. 3. His present work is very inter­esting, he likes it very much. 4. The Present Tense was explained at the last class. 5. All the reports which were presented by our young researchers will be discussed. 6. Who was not present at the last lesson? 7. At present the Russian chemical industry is developing on a wide scale. 8. Hydrogen ions are present in solutions of acids. 9. Its present condition isn’t perfect to use it again.

8. Read and translate the following word combinations:

chemistry is the science, it deals with materials, catalysis and crystal structure, entirely free of, regularities in properties, artificial radio-active elements, make a great contribution to the development of, under the certain conditions, under the same pressure.

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