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  1. Read the text and choose the correct answer/answers and find the proof in the text.

  1. Aristotle’s theory was

A. proved by Dalton

B. criticized by Democritus

C. was not new for that time

  1. People believed Aristotle because he

A. was a famous scientist

B. conducted a lot of experiments

C. used scientific methods

  1. The investigation of pressure and gases

  1. made Dalton draw a conclusion that gases are motionless

  2. proved the existence of atoms

  3. demonstrated finite nature of atoms

  1. Compounds consist of

  1. one or several elements

  2. the same elements in different ratio

  3. the same elements with the same ratio

  1. Dalton’s atomic theory is

  1. not used by modern scientists

  2. still popular

  3. not correct at all

  1. Match the given words with their English equivalents from the text: тотчас, пропорция, свидетельство, взрослый, отдельные элементы, состоять из, случайный, неделимый, предполагать, бесконечно.

  1. Fill in the gaps with suitable words: electron, investigated, compounds, substance, researched, subdivided, element, comprise, method, experiment.

  1. These substances are………. because the molecules that make it up have two kinds of atoms.

  2. Early in 1999 synthesis of the………. with atomic number 114 was reported.

  3. Soap is a unique …….of potassium fatty acid salts, produced through a chemical reaction called saponification.

  4. A single atom of oxygen cannot be …….. into simpler substances by any physical or chemical means.

  5. Dmitri Mendeleev ……… the properties of atoms in the late 1860s.

  6. In a scientific sense, a chemical process is a ……. or means of somehow changing one or more chemical compounds.

  7. This …….allows the students to generate a gas, oxygen, and test some of its properties.

  8. The antiparticle of the…….. is the positron; there are also antiquarks and antineutrinos.

  9. What elements ……… over 96 percent of living matter?

  10.  The relatively high extractable part of most …….. elements confirms mobility and potential availability to organisms.

IV. Make up sentences out of these words:

  1. Developed/ a model/ the properties/ to explain/ atoms/ behaviors of/ is/ theory/ an atomic/ and.

  2. Atomic/ English/ Dalton/ first/ chemist/ John/ the theory/ modern/ proposed.

  1. Reactions/ separate from/ occur/ atoms/ other/when/ combine or/ atoms.

4) Democritus/that all matter/advanced /tiny particles/about 400 B.C./consists of.

  1. Branches of/ science/ matter/ chemistry/ study/ physics/ that/ and/ are/ both.

V. Translate the sentences into English.

1. Джон Дальтон известный химик и физик жил в Англии с 1766 по 1844 год.

2. Дальтон выдвинул свою теорию строения элементов в 1800 году.

3. Теория Дальтона была не сразу принята всеми учеными.

4. Позднее эта теория была подтверждена и развита в соответствии с современными исследованиями.

5. Субатомные частицы были открыты век спустя.

6. Сейчас наука располагает точными знаниями о структуре и свойствах атомов и молекул.

7. В химии атом является самой маленькой частью элемента.

8.Разница в числе субатомных частиц отличает один атом от другого.