Условие:
. Oxygen is a highly reactive substance, readily combining with many other elements in the
process of oxidation.
2. Using different methods chemists isolated and identified about six million substances.
3. In the laboratory work the students used test-tubes, graduating cylinders and other glassware.
4. Hydrochloric acid if not used with great care may cause burns.
5. The vapour pressure of a liquid becoming equal to atmospheric pressure, the liquid boils.
6. Sometimes, preparing substances requires less skill than keeping them.
7. Solid bodies have the property of keeping their shape without supporting of a vessel.
8. Upon being heated, the molecules begin moving very quickly.
9. Without being treated this substance cannot be used.
10. Any moving object is able to do work, the quantity of kinetic energy depending on its
mass and velocity.
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