HOMEWORK

Say whether the following statements are true or false. Correct the false statements.

a)             Duration is measured in degrees Centigrade            F, in seconds

b)            The second is a unit of time                                      T

c)             Speed is measured in kilograms per hour.                 F, in km/h

d)            The watt is a unit of electrical charge.                      F, of el. power

e)             Density is measured in grams per metre cubed.        F kilograms per cubic metre

f)             The gram is a unit of mass.                                        T

g)            Liquid measurements are made in litres, or cubic decimetres.         T



GRAMMAR: COUNTABLE/ UNCOUNTABLE NOUNS

I. Divide the words below into two categories: countable and uncountable nouns

Counatble: percentage, metre, molecule, radius, second, temperature, fraction, base, acid, change,
object, ion, substance, electron, neutron

Uncountable: nitrogen, information, heat, chemistry, petroleum, water, light, matter,
equilibrium, research,

usually uncountable: science, salt, energy,


II. Complete the sentences below with “many”or “much”

1.                  How many electrons does an atom of carbon posses?

2.                  How many elements are there in the periodic table?

3.                  How much liquid does a beaker contain?

4.                  How many chemical elements does the atmosphere contain?

5.                  How much nitrogen does the atmosphere contain?

6.                  Do you find much useful information about chemistry on the Internet?

7.                  Will we exploit much more nuclear energy in the future than we do today?


III. Complete the sentences with “little”, “a little”, “few”, “a few”

1.                  As very little research has been done in the field, we still have no
antidote      to the disease.

2.                  Doing just a little research threw up some very useful information.

3.                  Only few scientists were invited to take part in the project. That is probably
why it was not successful.

4.                  The project team consists of a few well-known chemists.


Make several sentences and complete the units:

The

   height

   volume

   area

   width

   surface area

   length

   radius

   cross-sectional area

   diameter

   circumference

                       of

                         large

                         small

                         very small

                         minute

                         cylindrical

                                    objects

                                           is measured in

                                                         e.g. m

                                                         cm

                                                         mm

                                                         μm

                                                         m^3

                                                         cm^3

                                                         mm^3

                                                         m^2

                                                         cm^2

                                                         mm^2