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Exercise 8.

a)Put the verbs in the correct tense form, paying attention to the voice.

1. Aluminium chloride (dissolve) in water.

2. Last year a very interesting report about the interaction of tungsten with oxygen (to publish) by us.

3. We just (to find out) the composition of this substance.

4. Aluminium chloride (to use) in the cracking of oils.

5. The strength of aluminium (to improve) by work-hardening.

6. We (to develop) a new type of fuel which ( not to pollute) the environment.

7. When (to invent) overhead power cable ?

8. How (to produce) carbon dioxide industrially ?

9. Nowadays many chemists (to pay) more attention to the problem of the corrosion of metals.

10. What (to be) your understanding of the term “corrosion” ?

11. To determine the properties of this substance we (to employ) the method developed by Hopkins.

12. This article (to discuss) the solvolytic disproportionation of terbium oxide.

b) Compare aluminium with cobalt using comparative and superlative degrees on the scheme given in Lesson 4.

c) Chemical quiz: Are these sentences true or false ?

1. Aluminium chloride is a bluish solid.

3. Carbon reacts with aluminium and forms water.

4. Pure aluminium is soft and ductile.

5. The A1C1₃ molecule can also form compounds with other molecules that donate pairs of electrons.

6. Alloying elements include copper, silicon, tungsten and magnesium.

7. Aluminum is extracted from purified smaltine.

8. Cobalt is oxidized by hot air and also reacts with carbon, phosphorus, sulphur and dilute mineral acids.

d)Finish the sentences:

1. Cobalt is a …

2. Carbon has …

3. Bismuth is also used in …

4. Aluminium is protected by …

5. Aluminum chloride sublimes ….

6. Diamond occurs …

7. Citric acid is contained …

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