MARKS: 150 TIME: 3 hours This question paper consists of 16 pages and 4 data sheets. INSTRUCTIONS AND INFORMATION |1. |Write your centre number and examination number in the appropriate spaces on the ANSWER BOOK. | | | | | | | | | |Answer ALL the questions
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GREEN MUSSEL (Perna Viridis) SHELLS AS AN ADDITIVE COMPONENT IN HOLLOW BLOCK MAKING Abstract Hollow blocks have an important place in modern building industry. They are cost effective and better alternative to burnt clay bricks by virtue of their good durability‚ fire resistance‚ partial resistance to sound‚ thermal insulation‚ small dead load and high speed of construction. Hollow blocks being usually larger in size than the normal clay building bricks and less mortar is required‚ faster
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HKDSE CHEMISTRY – A Modern View (Chemistry) Coursebook 3 Suggested answers |Chapter 25 Simple molecular substances with non-octet |Page Number | |structures and shapes of simple molecules | | |Class Practice |1 | |Chapter Exercise
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INTERNATIONAL JOURNAL OF ENERGY AND ENVIRONMENT Volume 3‚ Issue 2‚ 2012 pp.237-246 Journal homepage: www.IJEE.IEEFoundation.org Municipal solid waste disposal by using metallurgical technologies and equipments Jiuju Cai‚ Wenqiang Sun State Environmental Protection Key Laboratory of Eco-industry‚ Institute of Thermal and Environmental Engineering‚ Northeastern University‚ Shenyang 110819‚ P. R. China. Abstract Pyrolysis of municipal solid waste can take full advantage of energy and
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Entropy Spontaneous Reactions: reactions that given the necessary Ea‚ proceed to completion without continuous assistance Enthalpy and Spontaneity * exothermic reactions tend to be spontaneous * Endothermic reactions can be either * Electrolysis of water is non-spontaneous it will stop if you stop the supply of energy * DD reaction between ammonium nitrate and barium hydroxide is spontaneous‚ even through the Entropy * Measure of disorder or randomness * Can apply to
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before permafrost to initiate the melting and help to continue build a shield of greenhouse gases to maintain heat. Mining Carbonate deposits can be done with the following chemical reaction which illustrates a small scale gas extraction procedure: CaCO3(s) + 2HCl(aq) CaCl2(aq) + CO2(g) + H2O(l) Hydrochloric acid would need to be imported from Earth to supply the activities on Mars which acid is reacted with the rocks to generate CO2. Calcium carbonate minerals contained within the rocks of Mars
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Part 1 – Design a strategy for neutralizing Fish Lake What do I know? (What do I remember about the neutralization reaction) Neutralization is when an acid and base are mixed together to me an ionic compound or which are 7 on the pH scale or pure water‚ it is also when a base and acid are mixed to make it in a neutral state. What am I wondering? (What are your rough ideas to fix an acidified lake?) I will be finding a base that will work the most effective way‚ also I will find a base that can
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radius‚ r(m) flow‚ Q(m3/s) Two flow regimes will be considered for each geometry: A. no gas phase present‚ as is common with laboratory cores or in deep reservoirs at pressure‚ and B. with a gas phase is present. The difference is important to CaCO3‚ FeCO3‚ FeS‚ etc.‚ but will no direct effect upon BaSO4‚ CaSO4’s‚ NaCl‚ etc. Objective: Express the fractional change in porosity‚ n/n‚ in terms of flow conditions‚ brine composition‚ and time. Specifically‚ the calculation of n/n can be considered
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its volume is decreased to 4.89 L while its temperature is held constant. (b) At what temperature in degrees Celsius is the volume of the gas 4.0 L if the pressure is kept constant. 2. Calcium carbonate‚ CaCO3(s)‚ decomposes upon heating to give CaO(s) and CO2 (g). A sample of CaCO3 is decomposed‚ and the carbon dioxide is collected in a 250-mL flask. After the decomposition is complete‚ the gas has a pressure of 1.3 atm at a temperature of 31.0 °C. How many moles of CO2 gas were generated
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Effects on Soil The soil has abundant amount of various metals and minerals. When these metals come in contact with acid rain there can be some harmful chemical reactions. These reactions can lead to soil erosion. Acid rains are known to reduce the fertility of the soil‚ leaving the land barren. Harmful acids can also reduce the amount of soil micro organisms which perform important job of breaking down the dead and decayed plants and other beings. Rainfall: Acid soils are most often found in areas
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