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IV. Match these word combinations with their Russian equivalents.

1) double replacement followed by decomposition

a) первоначально имевшийся в колбе

2) on warming a flask

b) вытеснять кислоту

3) to displace an acid

c) уравнение, представляющее реакцию

4) to flow down from a funnel

d) взаимодействие кислоты и основания

5) the interaction of an acid with a base

e) двойное замещение, за которым следует разложение

6) to dissolve some gas in water

f) стекать из воронки

7) the variety of salts

g) при нагревании колбы

8) originally present in the flask

h) растворить некоторое количество газа в воде

9) the equation representing reaction

i) разновидности солей

V. Paraphrase the sentences using the synonyms from the box instead of the underlined words. Pay attention to the verb forms necessary in each case – their Tense and Voice – when put the verbs from the box.

to prepare

to interact

to vary

to warm

to conduct

to result in

to transform

to pour

to place

  1. To carry out an experiment it is necessary to study the proper theoretical material.

  2. On heating the flask, the hydrogen chloride is expelled as a colourless gas with a suffocating odour.

  3. The acid flows down from the funnel and comes into reaction with the metal.

  4. Salts are produced in a laboratory by several types of chemical reactions.

  5. Iron or zinc is put in the middle bulb of the generator.

  6. The reaction of zinc with an acid gives the replacement of hydrogen atoms in the acid by zinc.

  7. The first step in obtaining hydrogen chloride is to put some sulphuric acid in a flask.

  8. The crystals of salts differ in colour and form.

  9. All the sodium chloride originally present in the flask has been changed.

VI. Insert the proper prepositions.

18: at (1) by (2) from (1) in (4) of (5) through (1) with (3)

1. … the lesson … inorganic chemistry the teacher carries out different experiments to illustrate the theory with practical examples.

2. We place the sodium chloride … a flask and add sulphuric acid … a tube.

3. The hydrogen chloride gas displaces air … the bottle.

4. Salts are prepared … the interaction … an acid … a base.

5. When hydrogen chloride comes … contact … the moist air it produces heavy clouds … white fumes.

6. The reaction … zinc … hydrochloric acid results … the replacement … hydrogen atoms … the acid … zinc.