Lesson three Oral topic: in the chemical laboratory Grammar

WORDS-SUBSTITUTES “one”, “ones”, “that of”, “those of”


Exercise 13. Analyze the sentences and find nouns which are substituted by the words “one”, “ones”, “that”, “those”. Translate the sentences.
Note: Words-substitutes are not translated into Russian. In some cases the translation of the noun may be used instead of the word-substitute.

Model:

The laboratory tables are higher than usual ones. Лабораторные столы выше, чем обычные (столы). As the body changes from a state of rest to one of activity, its requirements alter. По мере того как организм переходит от пассивного состояния к активному (состоянию), его потребности меняются. The simplest atom is that of hydrogen. Самый простой атом – атом водорода. Plants are divided into two main groups, those that have flowers, and those that do not. Растения делятся на две основные группы, растения у которых есть цветы и растения, у которых их нет.

1. 
   The mercury thermometer is more accurate than the alcohol one. 2. I don’t like this test tube. Can you give me a better one? 3. It was necessary to use hydrochloric acid instead of sulphuric one. 4. Synthesis is the use of chemical reactions to build larger molecules from smaller ones. 5. Within six months or so, 90 percent of molecules that make up our bodies are replaced by new ones. 6. Simple microscopes – ones with only one lens – are really no more than the magnifying glasses. 7. A compound has properties that can be different from those of its component elements. 8. One of the most interesting periods in the history of chemistry was that of alchemists, 500-1600 AD. 9. The earliest known system of classification is that of Aristotle. 10 The early chemists were aware that fluorides contained an unknown element, fluorine, and that its compounds greatly resembled those of chlorine, but they could not isolate it.