Some Properties of Matter. Грекова О.А. - 5 стр.

                                                 5
       In a way liquids are more troublesome to understand than solids, for they have no
regular structure, since the molecules do not keep to their places. On the other hand they have
the advantage that, at a fixed temperature, their properties are fixed. You do not know how a
metal will behave unless you know the history of its treatment, but the properties of liquids at a
given temperature and pressure are definite.

                                      Comprehension check
                                          True or False:
a)   In the world there are only a few kinds of atoms.
b)   At ordinary room temperature oxygen is a liquid.
c)   Silicon and aluminium were known more than 250 years ago.
d)   Gas is the simplest form of matter.
e)   Neon and argon are not elementary, they consist of molecules in which different sorts of
     atoms are combined.
f)   In gases the molecules are separated by, on average; distances large compared to their size.
g)   In the case of solids the molecules and their atoms keep to the same place.
h)   Great many solids have no crystalline form.
i)   Liquids have a regular structure.

III Writing:

     1. Find out the names of the substances, used in the text and make up a list.
     At ordinary room temperature they are:
     Gases                       Liquids                       Solids
     2. Write a short summery of the 2nd part of the text.


                                              Unit 2
I Pre-reading task:

     1. Check up the meaning of the following words:
     Verbs: weigh, measure, pump out, distinguish from, imagine, gain, depend on.
     Nouns: volume, balance, weight, sphere, pull of gravity, surface, pound, foot (feet), muscle,
     circumstances.
     Adj: obvious, sensitive, glass, sealed, fixed.
     Adv: clearly, perhaps, however, partly.

     2. Match the lines:

1)    weight       of a) is the amount of space that it contains or occupies
      smth.
2)    pull of gravity b) is how heavy it is, which you can measure in units such as: kilos or
                      pounds
3)    mass of smth c) is the force which makes things fall when you drop them
4)    sphere          d) is a round three-dimensional shape like a ball
5)    volume       of e) is the amount of physical matter that it has.
      smth