М. М. Кутепова The World of Chemistry Мир

a) Do you remember Leo Matveyev who discovered Bodium? He presented his communication and answered questions of the scientists. Can you answer the same questions?

1. 
   Calculate the empirical formula of Bodium chloride.
   
2. 
   Which group of the Periodic Table should Bodium be assigned to?
   
3. 
   What kind of bonding is likely to be present in Bodium chloride?
   
4. 
   If concentrated aqueous Bodium chlorine was electrolyzed, what would be the main products discharged at carbon electrodes? Write equations for the reactions which take place.
   
5. 
   Write an equation and name the products for the reaction between Bodium and water.
   
6. 
   Write the formula for (1) Bodium nitrate and (2) Bodium carbonate. For each of these compounds, state whether it would decompose at Bunsen burner temperature. Name any product(s) and write an equation for any reaction which occurs.
   

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b) Answer the other questions on the problems connected with the ideas expressed in Units 6 and 7:

1. 
   a) What are essential elements on the Earth?
   

2. 
   Which two elements on or near the Earth’s surface are not essential?
   
3. 
   Why are these two elements probably not essential?
   

2. 
   Describe one of the ways we use the energy released by a burning candle?
   
3. 
   What would be the danger of using pure methane as a household fuel for heating and cooking?
   
4. 
   Give your answer to the following quiz:
   

If you compress carbon at about eighty thousand kilos per square centimetre at a temperature of about 2500 degrees Centigrade, what do you get? This process in fact happens about 160 kilometres below the surface of the Earth. The resulting hard stones are pushed up to the Earth’s surface through natural pipes, and about five tons of them are mined every year, mostly in Russia and South Africa. These stones are vital for the metal industry, as they are used for cutting metal. This substance rates 15 on the Mohs’ scale of hardness — the maximum on the scale — and is the hardest natural substance. It is also the only precious stone composed of just one element.

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