atoms in 3.08g of tetrachloromethane (CCl4) b. The number of moles of fluorine atoms in 204 g of boron trifluoride BF3; c. The number of moles of chloride in 5.55 g of calcium chloride‚ CaCl 2 d. The number of moles of sulphate ions in 144g of magnesium sulphate 3 e. The number of molecules in 1000 cm of barium nitrate 5. 100 cm3 of hydrogen chloride gas was mixed with a metallic compound producing a very volatile & explosive reaction. What is the mass of this gas at RTP? Chemist ry 6
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CASE STUDY US MAGNESIUM SEEKS PROTECTION In Feb 2004‚ US Magnesium‚ the sole surviving US producer of magnesium‚ a metal that is primarily used in the manufacture of certain automobile parts and aluminum cans‚ filed a petition with the US International Trade Commission (ITC) contending that a surge in imports had caused material damage to the US industry’s employment‚ sales‚ market share‚ and profitability. According to US Magnesium‚ Russian and Chinese producers had been selling the metal at prices
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of O2 react? CHEMISTRY: A Study of Matter © 2004‚ GPB 8.13 3. ___Mg + ___HCl ___MgCl2 + ___H2 a. What mass of HCl is consumed by the reaction of 2.50 moles of magnesium? b. What mass of MgCl2 is produced if 3.67 moles of HCl react? c. How many moles of hydrogen gas are produced when 3.0 moles of magnesium react? 4. ___NH3 + ___O2 ___N2 + ___H2O a. How many moles of oxygen react with 0.23 moles of NH3? b. How many grams of water will be produced if 0.55 moles of oxygen
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w w w e tr .X m eP e ap UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Ordinary Level .c rs om 5070/11 CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB recommended) October/November 2011 1 hour *0909424295* READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples‚ paper clips‚ highlighters‚ glue or correction fluid. Write your name‚ Centre number and
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Calculate the concentration of the solution formed when 23.61 g of sodium phosphate is dissolved in 475.0 cm3 of water. 2. What volume of water is needed to dissolve 85.8 g of silver nitrate to make a 2.650 M solution? 3. What mass of magnesium sulphate is needed to make 1500 mL of a 2.45 M MgSO4 solution? 4. Calculate the concentration of the solution formed when 59.78 g of ammonium hydroxide is dissolved in 856.0 cm3 of water. 5. What volume of water is needed to dissolve 150
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is meant by the term atomic mass. Atomic mass is the weight of protons and neutrons combined in an element 14. How many electrons are there in the neutral atoms of the elements listed in Question 13? Helium= 2 Oxygen= 8 Sodium=11 Magnesium= 12 Chlorine=17 Sulfur= 16 16. Fill in the following table: Element Mass Number Protons Neutrons - Cobalt 60 27 32 - Fluorine 19 9 10
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spectrum was run. Next‚ apparatus for Grignard reaction was placed in an oven for an hour to ensure no moisture was present then set up for reflux with a dropping funnel to equalise pressure and a jack to allow easy removal of apparatus from heat. Magnesium turnings (2.68g)‚ anhydrous diethyl ether (15 cm3)‚ a crystal of iodine and a stirrer bar were added to the round bottomed flask (250 cm3) and anhydrous diethyl ether (25 cm3) and dry bromobenzene (15.7g) were added to the dropping funnel‚ ensuring
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THE CHEMICAL EARTH: 1. The living and nonliving components of the Earth contain mixtures ● Construct word and balanced formulae equations of chemical reactions as they are encountered Reactants → products Chemical reaction: the way atoms are joined changes‚ atoms are not created nor destroyed‚ but are rearranged Indicators: emission of light or heat‚ odour formation of a gas formation of a precipitate colour change change in state aqueous = dissolved in water‚ an aqueous solution
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Coupled Reactions ABSTRACT A way to drive a non-spontaneous reaction forward is by coupling it with another reaction that is highly spontaneous‚ resulting to a spontaneous overall reaction. In this study‚ since the extraction of C(s) from CO2(s) is a non-spontaneous process‚ it was coupled with the oxide formation reaction of Mg‚ a reaction with high spontaneity‚ so that the process of the extraction of C(s) would proceed. The reactions and products which were a mix of black and white
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AIM: To carry out a lab experiment to decompose a carbonate using heat‚ also to carry out appropriate tests for the formation of products as a result of this decomposition. DISSCUSION: Carbonates are decomposed by heat 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
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