English for chemists

Section II
Упр. 1. Назовите значения следующих интернациональных слов:
electronic, arc, rcfract, diffract, line, spectrum, progress, interpretation, regularity, especially, physicist, quantum, problem, extraordinary
Упр. 2. Определите значения выделенных слов по контексту.
1. Hertz is a unit offrequency. 2. The discovery of the atomic structure laid the basis for further discoveries in scicncc. 3. The measurements must be made very carefully. 4. Heat and light arc often emitted during the reaction. 5. When we use some example in our work, one can say that we work according to a pattern.
Gioea к тексту:
excite—возбуждать; spark— искра; distinctive—отчетливый; achieve — достигать; successfully— успешно; advance — улучшение, прогресс
Text 15 В
Прочтите текст про себя (контрольное время чтения — 3 минуты).
The Bohr Theory of the Hydrogen Atom
Most our knowledge of the electronic structure of atoms has been obtained by the study of the light given out by atoms when they arc cxcitcd by high temperature or by an clcctric arc or spark. The light that is emitted by atoms of a given substance can be rcfractcd or diffracted into a distinctive pattern of lines of certain frcqucncics; such a distinctive pattern of lines is said to be the line spectrum of the atom.
The careful study of line spcctra began about 1880. Early investigators made some progress in the interpretation of spcctra, in recognizing regularities in the frcqucncics of the lines; the frcqucncics of the spectral lines of the hydrogen atom, for example, show an especially simple relationship with one another. It was not until 1913, however, that the interpretation of the spectrum of hydrogen in terms of the electronic structure of the hydrogen atom was achieved. In that year, die Danish physicist Niels Bohr (1885-1962) successfully applied the quantum theory to this problem, and laid the basis for the extraordinary advancc in our understanding of the nature of matter that has been made since then.

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Упр. 3. Передайте основное содержание текста в нескольких пред­ ложениях.
Упр. 4. Составьте план текста.
Упр. 5. Прочтите предложения и скажите, соответствуют лн они содержанию текста. Если нет, неправые их.
1. There was only one atomic theory in the history of chcmistry. 2. The light that is emitted by atoms of a given substancc gives a distinctive pattern. 3. The line spectrum is the spectrum of an atom but not a molcculc. 4. The result of early investigations was that the line spcctra of the hydrogen atom were not alike. 5. Niels Bohr was not interested in studying spectral lines. 6. The application of the quantum theory helped to understand the electronic structure of the hydrogen atom better.
Упр. б. Найдите в тексте н переведите на русский язык предложе­ ния, где идет речь об образовании линейного спеюра.