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4. Match the words from the text with their definitions (a-h).

• neutralization 1 ____ • acid 2 ____ • base 3 ___ • element 4 ____ • compound 5 ____ • proteins 6 ____ • lipids 7 ____ • carbohydrate 8 ____ • properties 9 ____ • tissue 10 ____

a) fats, waxes and sterols

b) a chemical reaction where a base and an acid react

c) a biological molecule consisting of carbon (C), hydrogen (H) and oxygen (O) atoms

d) chemical agents that release hydrogen ions when added to water.

e) a substance consisting of atoms which all have the same number of protons

f)  substances that, in aqueous solution, are slippery to the touch and taste astringent,

g) an entity consisting of two or more atoms

h)group of cells with similar properties

i)  macromolecules, consisting of one or more long chains of amino acids

j) parameters or characteristics

Writing

5. Complete the sentences with the words in the box.

identified changes comprises exist pathogenesis conduct insoluble waxes prevent sour

1. This substance is _____________in water and it means that the spot will not disappear unless you use special washing powder.

2. This group _______________ many small subgroups.

3. All chemical elements have already been __________________ by the scientists.

4. When I tasted the soup I felt strange ____________________ taste of citric acid.

5. As we studied more patient cases, the _____________ of the disease became clear.

6. If you rub an apple for a long time, you will see the ______________________ on its surface producing a greasy film.

7. If you keep to the basic safety rules in the laboratory, this may ________________ accidents.

8. The substance underwent many radical _____________________ after all the reactions.

9. It is well known that water doesn’t _________________________ electricity.

10. We know that many bacteria _________________________ in this environment.

6. Are these statements true (t), false (f)? Write true sentences.

1. Chemists study the physical and chemical properties of the substances. (T/F)

__________________________________________________________________________

__________________________________________________________________________

2. There are 111 elements existing on the Earth. (T/F)

__________________________________________________________________________

__________________________________________________________________________

3. Chemistry comprises such fields as inorganic chemistry, organic chemistry, biochemistry etc. (T/F)

__________________________________________________________________________

__________________________________________________________________________

4. Acids turn red litmus blue and contain one or more of the hydroxyl groups. (T/F)

____________________________________________________________________

____________________________________________________________________

5. Oxidation is the action between an acid and a base to form a salt and water. (T/F)

____________________________________________________________________

____________________________________________________________________

6. Lipids are made of many aminoacids linked together. (T/F)

____________________________________________________________________

____________________________________________________________________

7. Polysugars are represented with ribose, glucose, galactose. (T/F)

____________________________________________________________________

____________________________________________________________________

8. Lipids are found in all living things that are greasy and insoluble in water. (T/F)

_________________________________________________________________________

_________________________________________________________________________

9. Proteins are separated into groups based chiefly on physical properties. (T/F)

____________________________________________________________________

____________________________________________________________________

10. Waxes are complex substances found in various tissues of the brain and nervous system.

(T/F)

__________________________________________________________________________

__________________________________________________________________________

Speaking

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