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  1. Language development.

1. Complete the sentences using words and phrases from the text.

    1. A solution is ...

    2. In all solutions the dissolved substance is called ...

    3. The medium in which the substance is dissolved ...

    4. Most solutions are liquids, but ,,.

    5. Solutions are involved in most chemical reactions ...

    6. All samples of a solution have the same properties (homogenous), but...

    7. An example of a suspension is ...

    8. Emulsions are ...

    9. The solubility of a substance (at the existing temperature) means....

    10. The concentration of the solution is the amount of the substance....

2. Answer the following questions.

                1. What is solution?

                2. What is solute?

                3. What is solvent?

                4. What is the physical form of solutions?

                5. What are electrolytes and nonelectrolytes?

                6. What are chemical reactions the chemical solutions are invol­ved in?

                7. What is suspension?

                8. What is emulsion?

      1. Match each wont from column A with its opposite from column II

  • A

    B

    1. dull

    a. interrupted

    2. continuous

    b. unstable

    3. considerable

    c. unwanted

    4. fixed

    d. transparent

    5. required

    e. to forbid

    6. to allow

    f. loss

    7. to combine

    g. insignificant

    8. excess

    h. to dissolve

    9. to comprise

    i. unordinary

    It), commonest

    j. to exclude


    V. Speaking.

    1. Make questions for the answers. Then, in pairs, act out the dialogue.

    • __________________________________________________?

    • A solution is a homogeneous structure of two or more substances.

    • __________________________________________________?

    • Most solutions are liquids, but solutions can be of gases or solids.

    - ________________________________________?

    - Solutions are involved in most chemical reactions.

    • __________________________________________________?

    • All samples of a solution have the same properties.

    • __________________________________________________?

    • Concentration is the amount of the substance, which has been dis­solved by the given quantity of the solvent.

    1. Give as much information as you can about:

    --- fields of chemistry;

    • possibilities of career in different fields of chemistry;

    • modern branches of chemistry like biochemistry and chemical en­gineering.

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