ĐỀ THI OLYMPIC TIN HỌC QUỐC TẾ potx

... sách được định dạng như sau: < Book > < Start > < Finish > Cuộc thi Olympiad Tin học Quốc tế lần thứ hai được tổ chức tại MINSK,BYELLORUSSIA năm 1990 Ngày thứ nhất Bài ... C:\IOI\GARDEN.SOL, as follows: N (the number of fountains in the input) Cuộc thi Olympiad Quốc tế môn Tin học lần thứ tư tổ chức tại Bonn, Germany, tháng 7 năm 1992 1....

Ngày tải lên: 23/06/2014, 01:20

... excess of a 10 % sodium hydroxide solution. In this case 0.896 dm 3 of a gas were also evolved but 0.96 g of an undissolved residue remained. In the third experiment, 1.52 g of the initial mixture ... as hydrogen. This mixture with a volume of 16.8 dm 3 was hydrated and 350 g of the solution were obtained when the products of hydration were absorbed in water. Ten grams of this solution...

Ngày tải lên: 06/04/2014, 15:41

... .10 5 Pa and then the flasks were weighed. After subtracting the weight of the empty flask, the mass of the gas inside was determined. This procedure was repeated with nitrogen. Thus the following ... assumption: Only hydrogen is evolved at the cathode and at the same time oxygen at the anode. On this assumption the amounts of substances of the evolved oxygen and hydrogen are as follows:...

Ngày tải lên: 06/04/2014, 15:41

... Diphenyl 70 - Anthracene 216 - Styrene - 146 MERCAPTANS – THIOPHENOLS n-Amylmercaptan - 126 p-Thiocresol - 200 Thiophenol - 169 p-Bromothiophenol 74 - PHENOLS p-Cresol 36 200 o-Nitrophenol ... H 2 O O + red colouration Name: The above reactions, the solubility behaviour and the melting range indicate that this substance is D-fructose, a building block of cane sugar....

Ngày tải lên: 06/04/2014, 15:41

... ____________________ SOLUTION a) Melting points: 4-ethoxy-N-acetylphenylamin (phenacetine) : 135 °C 4-ethoxy-2-nitroacetanilide : 103 °C (theoretic al value) b), c) Documentation, Thin-layer chromatogram ... as that of the starting compound phenacetine. Although nitration has occurred, the molecules exhibit less dipolar character that indicates intramolecular hydrogen bridges. Th...

Ngày tải lên: 06/04/2014, 15:42

... in the distillation flask), of IV (in the distillate) and samples of the starting material II are hydrolyzed by heating with a strong sodium hydroxide solution. The phosphate ions formed are ... crystals. c) Recrystallization of the chalcone Recrystallize this crude chalcone from ethanol, using a 100 cm 3 beaker. Use the heating plate located in the hood (fume chamber). When the crys...

Ngày tải lên: 06/04/2014, 15:42

... synthesis, depicted below, for the thiolated portion of MK-0476 starting from diethyl ester A. 3.1 Give the structures of the intermediate products B - F prepared during this synthesis. COOC 2 H 5 COOC 2 H 5 1) ... compounds with high melting points, but compound I can be transformed into II by the elimination of AlCl 3 . which is a volatile solid and can be relatively easily r...

Ngày tải lên: 06/04/2014, 15:42

... reaction flask. Shake well. 8. Titrate the remaining iodine with standard thiosulphate solution. 9. Record the volume of the thiosulphate solution. 10. Repeat the above steps (Steps 3 to 9) for ... by Anton Sirota ICHO International Information Centre, Bratislava, Slovakia 779 THE THIRTY-THIRD INTERNATIONAL CHEMISTRY OLYMPIAD 6–15 JULY 2001, MUMBAI, INDIA ______________________...

Ngày tải lên: 06/04/2014, 15:43

... Germany. Since the concrete walls and the roof of the house are relatively thin (20.0 cm) there will be a loss of energy. This energy is released to the surroundings (heat loss released to water ... s h -1 × 1 kJ s -1 h) -1 = 109.75 € Rent for equipment: 100.00 € Total cost of electric heating: 209.75 € THE 36 TH INTERNATIONAL CHEMISTRY OLYMPIAD, 2004 THE COMPETITION PROBLEMS ....

Ngày tải lên: 06/04/2014, 15:44

Ngày tải lên: 16/08/2013, 20:41