1. Text 5 goes under the title "Phosphorus" and describes this element in the Periodic Table in great details. 2. The author gives many interesting facts concerning the properties and peculiarities of phosphorus and compares it with (w/) nitrogen. 3. Firsly, phosphorus and nitrogen have much in common, but they also differ greatly. 4. While nitrogen is quiete inactive under ordinary conditions, phosphorus reacts rapidly both w/ metals and non-metals. 5. At ordinary temperature, nitrogen is a gas, and phosphorus is a solid. 6. Secondly, phosphorus has the following properties: - it is almost insoluble in water; - it dissolves in many solvents. 7. The article goes on that phosphorus exists in several aliotropic forms, only 2 of them are of general interest. One is white phosphorus. 8. The most striking property of white phosphorus is its activity w/ oxygen. 9. It is very combustible, that's why it must be left under water. 10. The author gives some measures of precaution while handling white phosphorus. 11. They are as follows: - never handle white phosphorus w/ bare hands; - always remember that it's very poisonous, it may cause chronic poisoning. 12. In the conclusion, it should be mentioned that red phosphorus is a more stable form. It isn't so combustible, but the products formed are the same produced by white phosphorus. That's about all;-)
Только часть вопросов 1. Where is Saint-Petersburg situated 2.what was the first name of the city 3.who founded Saint Petersburg 4.when did the city get name of Petrograd 5. What name did the city get in 1914 6. When did the city change name for Leningrad 7.when did Peter the great found the city 8. When did Peter the great move the capital from Moscow 9. What did Peter the great do in 1712? 10. Where can we see the famous monument to Peter the Great 11. What is Saint Petersburg famous for 12.How many bridges are in the city 13. What do the tourists do in Saint Petersburg
2. The author gives many interesting facts concerning the properties and peculiarities of phosphorus and compares it with (w/) nitrogen.
3. Firsly, phosphorus and nitrogen have much in common, but they also differ greatly.
4. While nitrogen is quiete inactive under ordinary conditions, phosphorus reacts rapidly both w/ metals and non-metals.
5. At ordinary temperature, nitrogen is a gas, and phosphorus is a solid.
6. Secondly, phosphorus has the following properties:
- it is almost insoluble in water;
- it dissolves in many solvents.
7. The article goes on that phosphorus exists in several aliotropic forms, only 2 of them are of general interest. One is white phosphorus.
8. The most striking property of white phosphorus is its activity w/ oxygen.
9. It is very combustible, that's why it must be left under water.
10. The author gives some measures of precaution while handling white phosphorus.
11. They are as follows:
- never handle white phosphorus w/ bare hands;
- always remember that it's very poisonous, it may cause chronic poisoning.
12. In the conclusion, it should be mentioned that red phosphorus is a more stable form. It isn't so combustible, but the products formed are the same produced by white phosphorus.
That's about all;-)
1. Where is Saint-Petersburg situated
2.what was the first name of the city
3.who founded Saint Petersburg
4.when did the city get name of Petrograd
5. What name did the city get in 1914
6. When did the city change name for Leningrad
7.when did Peter the great found the city
8. When did Peter the great move the capital from Moscow
9. What did Peter the great do in 1712?
10. Where can we see the famous monument to Peter the Great
11. What is Saint Petersburg famous for
12.How many bridges are in the city
13. What do the tourists do in Saint Petersburg