Find the paragraphs in the text to discuss the following topics.
- hydrogen occurrence;
- physical properties of hydrogen;
- hydrogen production;
- substances commonly used for the preparation of hydrogen.
Write out the sentences expressing the main idea(s) of each paragraph. Retell the text briefly in your own words making use of the sentences you have written out.
Put the sentences in the correct order to make up a coherent text.
1. Later he learnt that Henry Cavendish in London had made similar experiments and had obtained water as a result of a combustion of the mixture of "inflammable air" and oxygen.
2. Lavoisier repeated the experiment and made a striking discovery that water was not an element.
3. And he gave "inflammable air" the name of hydrogen.
4. In accordance with the theory of acids existing at that time, the result of the reaction of inflammable air and oxygen was expected in the form of an acid, but what Lavoisier obtained was only water.
5. Give detailed answers to the following questions.
1. What are the physical properties of hydrogen?
2. In what way was hydrogen obtained first?
3. What are the chemical properties of hydrogen?
4. What do you know about the isotopic forms of hydrogen?
5. What are the ways of obtaining hydrogen?
6. The element hydrogen is a highly flammable gas, but when two atoms of hydrogen are combined with one atom of oxygen, the result is water, which certainly doesn't burn. Explain how such different compounds can exist and yet still contain the element hydrogen.
Speak on the following topics.
1. The Structure of a Hydrogen Atom.
2. Hydrogen as the Unit of Measurement for the Masses of Other Elements.
3. The Difference between the Isotopic Forms of Hydrogen.
4. Commercial Obtaining of Hydrogen.
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