Yashmakova, Alexandra 9/3 21 February, 2016 RESEARCH PARAGRAPHS ALUMINUM OXIDE Aluminum oxide is a chemical compound with the chemical formula Al2O3 which consists of oxygen and aluminium. It is found in the nature as the mineral corundum which is colourless and very hard substance used as an abrasive. Aluminum oxide is characterised with its colour, insolubility in water and its melting point which is 2030 oC. The boiling point of this compound is 2977oC. Its density is 3.97 g/cm³.
Balanced Chemical Equation: Cu(OH)2 (s) + Heat —> CuO (s) + H2O (g) Reaction 4: when a sulphuric acid is added to the solution that contains copper (II) oxide, a double displacement reaction will occur. the copper (II) oxide will react with the sulphuric acid producing copper (II) sulfate and water. The copper and hydrogen gas replace each other. Balanced Chemical Equation: CuO (s) + H2SO4 (aq) —> CuSO4 (aq) + H2O (l) Reaction 5: when zinc is added to the copper (II) sulfate solution, a single displacement reaction will occur. The zinc will form a new compound with the sulfate, and the copper will stay as a metal.
1,3,4-Oxadiazole (1) is a heterocyclic compound containing an oxygen atom and two nitrogen atoms in a five-membered ring. It is derived from furan by substitution of two methylene groups (=CH) with two pyridine type nitrogens (-N=) [1,2]. There are three known isomers: 1,2,4-oxadiazole (2), 1,2,3-oxadiazole (3) and 1,2,5-oxadiazole (4). However, 1,3,4-oxadiazole and 1,2,4-oxadiazole are better known, and more widely studied by researchers because of their many important chemical and biological properties. Among heterocyclic compounds, 1,3,4-oxadiazole has become an important construction motif for the development of new drugs.
The graphical illustration of the representative configurations under consideration is depicted in Figure 2. Possible interactions which considered for HOY molecules with HC3OX are including hydrogen bonding (O···H) and halogen bonding (X···Y,O···X) which have been denoted as XYm. The X is representing the cyclopropenone (HC3OF, HC3OCl, HC3OBr, and HC3OI were defined as F, Cl, Br and I, respectively); Y shows the HOY molecules (HOF, HOCl, HOBr, and HOI were defined as F, Cl, Br and I, respectively) and m was applied for displaying the type of complex that formed between them. For example FI1 shows type 1 complex of HC3OF with HOI or BrBr2 is illustrating type 2 complex of HC3OBr with HOBr. The XY1 type shows O···H interactions, which HOY acts as hydrogen bond donor (HBD).
In addition, they have fluorine atom bond to carbon in the chain. This molecules also do not want to stay near other molecules. However, the fluorine atoms are very like to stick with another fluorine atoms in the chain, so that make the chain of polytetrafluoroethylene is very attract to each other. The polytetrafluoroethylene has a high melting
INTRODUCTION The metal that can be recycled over and over again and in turn saves energy and natural resources – Aluminium, is silver and soft metal which belongs to the 13th group and is a part of p – block elements. It was first isolated by Friedrich Wohler in 1827 and then named by Humphry Davy in 1807. The atomic number of Aluminium is 13 and it has electronic configuration – [Ne] 3s² 3p¹. HISTORY Aluminium salts was used by Greeks for dyeing and dressing wounds in ancient times. Later on, Hans Christian Orsted produced an impure form of Aluminium in the year 1825.