Английский язык. Кислякова Н.В - 6 стр.

                                        6
   1.Water is an excellent …
   2.Most of the substances are … in water.
   3.… may be defined as a homogeneous mixture of one or more substances.
   4.… is one of the chemical properties of a substance.
   5.If we … some of the hydrochloric acid gas in water, the solution has a sour
     taste.
B. purification        to purify


               purity


   impurity             pure

   1.All plants and factories must have the system of … of industrial wastes.
   2.… water can be prepared by distillation, filtration or boiling.
   3.… water prepared by distillation is often used as a solvent.
   4.Natural waters have different …
   5.Providing … of water pools in our country is one of the most important
     ecological problems.
       V. Match the words in the left column with the suitable words in the right
column and explain in English the meaning of these word combinations.
Model: Alcohol is a chemical substance often used as a solvent.
          Dropper                   Property
          Purified                  Device
          Density                   Parametre
          Alcohol                   Mixture
          Weighing                  Characteristics
          Solution                  Substance
          Temperature               Process