Before reading the text make sure whether you read these words correctly

pursuit, dyeing, elixir, exoteric, esoteric, spiritual, ritual, prominently, macrobiotics, interpret, procedure, aurifiction, aurifaction, indistinguishable, ingredient, discipline, remedy.

Study and remember the following chart:

4. Analyze the Infinitives and their functions and translate the sentences ino Russian:

1. The purpose of these experiments was to observe the properties of the elements involved. 2. Chemical reactions that change the concentration of hydrogen ions to become the same as in pure water are called neutralization reactions. 3. Ammonium ions interact with water to form hydronium ions in equilibrium with molecular ammonia. 4. No special regulation of concentration is required to effect a separation between chlorides of these ions. 5. Rutherford was the first to change nitrogen to oxygen by bombarding nitrogen atoms with alpha particles. 6. To determine the relative weights of different elements we were to use the relative system of atomic weights. 7. A slight addition of pressure at this temperature should cause liquefaction to take place, but beyond this temperature no amount of pressure would enable the gravitational attraction to exceed the energy of motion. 8. In order to liquefy a gas at a temperature below its critical temperature it is practically necessary only to compress the gas. 9. The aim of these researchers is to find out the required elements. 10. The substance to be extracted should be more soluble in the extracting solvent than in the initial solution. 11. To establish the molecular weight of oxygen means to find the number of atoms in the oxygen molecule. 12. The apparatus to be used in our work was improved in our lab. Where is the mixture to be heated?

Warming-up:

1.What is alchemy?

2.What do you know about alchemists?

3.When did they experiment?

4.Why were their ideas forgotten?