into the corresponding oxides and carbon dioxide. The temperature of decomposition depends upon the activity of the metal; that is to say‚ the more active the metal‚ the more stable is the carbonate. Thus‚ the carbonates of sodium and potassium are stable at the highest temperature of a Bunsen burner flame‚ whereas the carbonates of silver and copper are easily decomposed. In this experiment copper (ii) carbonate will be decomposed at a high temperature‚ forming copper (ii) oxide and carbon dioxide:
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December 2010‚ pp. 1593-1600 Characterization and photocatalytic activity of SiO2-TiO2 mixed oxide nanoparticles prepared by sol-gel method Ali Mahyar*‚ Mohammad Ali Behnajady & Naser Modirshahla Department of Applied Chemistry‚ Faculty of Science‚ Islamic Azad University‚ Tabriz Branch‚ Tabriz‚ Iran Email: alimahyar@hotmail.com Received 9 August 2010; revised and accepted 15 November 2010 SiO2-TiO2 mixed oxides have been prepared by sol-gel technique from titanium tetraisopropoxide and tetraethylorthosilicate
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hollow block Many people used pure cement hollow block in making buildings but this research aims to make a more durable and fire retardant hollow block in making infrastructures. Background: The glass contains lime‚ magnesium oxide‚ and aluminum oxide that add more durability. Barium also increases the refractive index and low dispersion that make it endure shock. Plastics contain stabilizing additives that include fire retardants to lower the flammability of a material. These 2 combined
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1. 2. Sodium cloride Magnesium oxide Calcium bromide Aluminum sulphide Nickle (III) chloride (indicates charge) 3. CaBr2 4. Al3+ Ni3+ S2Cl- Al2S3 5. NiCl3 6. Sodium thiosulphate (complex ion) Na2S2O3 7. Aluminum silicate (complex ion) Al2(SiO3)3 (must bracket a complex ion with a subscript) 8. Ammonium phosphate NH4+ PO43- (NH4)3PO4 (bracket comples ion with a subscript) 9. Barium oxide Ba2+ O2- Ba2O2 BaO (written
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ore‚ and • Purification of the metal. It is also called ‘Refining’. Stages of extraction of metals: After the concentration of the ore is done‚ there are two main steps or stages in extractive metallurgy. They are: Conversion of the ore into Metal oxide or metal compound. Extraction of crude metal from metal from metal compound. Concentration of ores: Removal of the unwanted materials (e.g.‚ sand‚ clays‚ etc.) from the ore is known as concentration‚ dressing or benefaction. It involves several steps
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What is the total number of atoms in (NH4)2SO4? (1) 10 (2) 11 (3) 14 (4) 15 22. Write the correct formula for the following binary ionic compounds. (a) Lithium fluoride LiF (b) Calcium oxide CaO (c) Aluminum nitride AlN (d) Beryllium chloride BeCl2 (e) Potassium iodide KI (f) Aluminum oxide Al2O3 23. Write the correct formula for the following binary molecular compounds. (a) Carbon monoxide CO (b) Boron tribromide BBr3 (c) Sulfur hexafluoride SF6 (d) Carbon dioxide
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COMPOUNDS “Analytical chemistry -I” http://foricseandbeyond.blogspot.in/ metal oxide “Oxides of metals are generally stable to heat and they are considered to be most stable form of compound found in nature.” Oxides of potassium‚sodium‚calcium‚magnesium‚ aluminum ‚ zinc‚iron‚lead and copper are stable to heat uO C PbO Zn O http://foricseandbeyond.blogspot.in/ MERCURIC OXIDE “Mercury(II)oxide” “orange red” 2HgO 2Hg + O2 1.The amorphous powder changes to dark red and
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number of moles of hydrogen ions in 100 cm3 of 0.100mol/dm3 hydrochloric acid. (ii) Give an ionic equation to represent the neutralization reaction. Q2. Manganese (IV) oxide catalyses the decomposition of aqueous hydrogen peroxides. In an experiment 50.0 cm3 of aqueous hydrogen peroxide was mixed with 0.50 g of manganese (IV) oxide. The total volume of oxygen formed was measured every 10 seconds. The results of the experiment are shown in the graph. (i) After how many seconds did the
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of the Experiment: The Empirical Formula of an Oxide Authors: Section Number: Chemistry Location and Date II. Abstract The aim in this lab was to determine the empirical formula of an oxide of magnesium through combustion in air. This was achieved by heating an established mass of magnesium in air inside of a crucible‚ ultimately attaining a compound that contained Mg and O. The major result of the experiment was the empirical formula of the oxide of magnesium. III. Introduction An empirical
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w w ap eP m e tr .X w om .c s er June 2003 INTERNATIONAL GCSE MARKING SCHEME MAXIMUM MARK: 40 SYLLABUS/COMPONENT: 0620/01 CHEMISTRY (Multiple Choice) Page 1 Mark Scheme IGCSE EXAMINATIONS – June 2003 Syllabus 0620 Question Number Key Question Number Key 1 2 3 4 5 C B A D A 21 22 23 24 25 B D A B D 6 7 8 9 10 C A A B C 26 27 28 29 30 B D D D B 11 12 13 14 15 B D C D
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