Answer Paper for Science and Technology - II - Paper 4 Time: 2.0 Hrs.------------------------------------------------------------------------------------Max. Marks: 40 Note 1). All questions are compulsory. Note 2). All questions carry equal marks. Note 3). Draw neat and labelled diagrams wherever necessary. Important note from mySSC.in - In this ’Answer paper’‚ questions are displayed for your convenience. In actual exam‚ do not write the questions. Only answers are expected in answer paper
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CHEMICAL WEATHERING Chemical weathering is a process of alteration of rocks of the Earth’s crust. is a chemical decomposition process. is brought out by atmospheric gases and moisture. End product has a different chemical composition and poorer physical constitution. The process: Chemical change in the nature of rock takes place in the presence of moisture containing many active gases such as CO2‚ N2‚ H2‚ and O2. Rocks are made up of minerals. All the minerals in a rock are not in
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powder (NaHCO3) better known to chemists as sodium bicarbonate‚ bicarbonate of soda‚ sodium hydrogen carbonate‚ or sodium acid carbonate. It is classified as an acid salt‚ formed by combining an acid (carbonic) and a base (sodium hydroxide)‚ and it reacts with other chemicals as a mild alkali. At temperatures above 300 degrees Fahrenheit (149 degrees Celsius)‚ baking soda decomposes into sodium carbonate (a more stable substance)‚ water‚ and carbon dioxide. Sodium bicarbonate was discovered by two
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Republic of the Philippines DEPARTMENT OF EDUCATION REGIONAL SCIENCE HIGH SCHOOL FOR REGION I Division of La Union Bangar‚ La union Effectiveness of Snail shell (Nassariusmutabilis) asAdditive in Chalk Making Proponents: FERNAN MACUSI GERALD JAVAR (IV- Europium) ROGELIO C. VALDEZ (Research Adviser) Abstract Table of Contents Title……………………………………………………………………………………….…i Abstract…………………………………………………………………………………......ii
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The lime industry is a significant carbon dioxide emitter. The manufacture of one tonne of calcium oxide involves decomposing calcium carbonate‚ with the formation of 785 kg of CO2 in some applications‚ such as when used as mortar; this CO2 is later re-adsorbed as the mortar goes off. Additionally‚ if the heat supplied to form the lime (3.75 MJ/kg in an efficient kiln) is obtained by burning fossil fuel it will release CO2: in the case of coal fuel 295 kg/t; in the case of natural gas fuel 206 kg/t
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not isolate it he could only isolate the barium oxide. Another person to isolate the barium oxide was a man named Johan Gahn but he did it two years after Scheele did. Davy who finally managed to isolate barium on its own‚ did it by analogy with calcium and decided to name it Barium after the word baryta. Pure oxygen used to be produce through the Brin Process before they started using barium peroxide to liquefy air and produce oxygen. Barium appears as a silvery white color metal. Barium van be
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Podzols In soil science‚ podzols (also known as podsols or Spodosols) are the typical soils of coniferous or boreal forests. They are also the typical soils of eucalypt forests and headlands in southern Australia. The name Podzol is derived from the Russian words pod = under and zola = ash. Characteristics of Podzol soils - Deep organic layer comprising L (litter)‚ F (fermenting organic matter) and H (humus) forest‚ less under moorland - An ash-grey‚ structure less‚ silica rich E or elluvial
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permanganate 7783-98-4 AgN3 silver azide 13863-88-2 AgNO3 silver nitrate 7761-88-8 Ag2O silver oxide 1301-96-8 AgONC silver fulminate 5610-59-3 AgSNC silver thiocyanate 14104-20-2 Ag2C2 silver acetylide 7659-31-6 Ag2CO3 silver(I) carbonate 534-16-7 Ag2C2O4 silver oxalate 533-51-7 Ag2Cl2 silver(II) dichloride 75763-82-5 Ag2CrO4 silver chromate 7784-01-2 Ag2Cr2O7 silver dichromate Ag2F silver subfluoride 1302-01-8 Ag2MoO4 silver molybdate 13765-74-7 Ag2O silver(I)
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acid level > 8 · potassium level > 6 · phosphorus level > 4.5 · calcium level < 7 Clinical TLS - any of the above laboratory values with an elevated serum creatinine‚ a new arrhythmia‚ seizure or sudden death Hyperphosphatemia · caused by the release of intracellular phosphate pools within tumor cells · causes a reciprocal decrease in serum calcium‚ which then · causes the deposition of calcium phosphate crystals in the renal tubules and in the microvasculature‚ and can
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properties 9.15 Transition elements 9.16 Noble gases 9 Metals 10.1 Properties of metals 10.2 Reactivity series 10.3 (a) Extraction of metals 10.3 (b) Uses of metals 10 Air and water 11 Sulphur 12 Carbonates 13 Organic chemistry 14.4 Names of compounds 14.5 Fuels 14.6 Homologous series 14.7 Alkanes 14.8 Alkenes 14.9 Alcohols 14.10 Acids 14.11 Macromolecules 14.8 (a) Synthetic polymers
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