CHEMISTRY Guess Paper – 2013 Class – XI Subject - CHEMISTRY MAX MARKS=90 ……………………………………………………………………………………… General instructions: All questions are compulsory. Marks for each question are indicated against it. Questions number 1to 8 are very short –answer questions‚ carrying 1 mark each. Answer these in one word or about one sentence each. Questions number 9 to18 are short –answer questions‚ carrying 2 marks each. Answer these in about 30 words each. Questions number19 to27
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education *4308315385* CHEMISTRY Paper 2 Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number‚ candidate number and name in the spaces at the top of this page. Write in dark blue or black pen. You may need to use a pencil for any diagrams‚ graphs or rough working. Do not use staples‚ paper clips‚ highlighters‚ glue or correction
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Observing a Limiting Reactant An experiment was carried out to predict the limiting reactant in a chemical reaction between Magnesium and Hydrochloric acid‚ using the mole concept. Limiting Reactant: It is the reactant that will deplete or will be used up first during a chemical reaction. Limiting reactant also determine how long the reaction will last for. Balanced Equation: Mg + 2HCl = MgCl2 + H2 The balanced equation is needed to determine the mole ratio between the two reactants. From
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Class 4 – Flammable Solids Division 4.1 – Flammable Solids are: • Wetted explosives that are Class 1 explosives when dry‚ that are sufficiently wetted to suppress explosive properties. • Self-reactive materials that are thermally unstable and can undergo strong exothermic decomposition even in the absence of oxygen. Readily combustible solids that can cause fire through friction‚ such as matches. Powdered‚ granular or pasty materials must be classified as Division 4.1 when the time of burning of
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control water group reflects my hypothesis‚ with near to no growth due to the mineral deficiencies within the solute. The tube containing Nitrogen has a very small and weak stem‚ and the tube containing Magnesium successfully grew large green leaves‚ supporting scientific evidence of plants using magnesium for chlorophyll production [later used in photosynthesis]. The tube containing Calcium had stunted and minimal stem and root growth‚ and barely grew at all over the week period. The orange plant
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causes nausea and vomiting Uses: • gastric antacid for hyperchlorhydria • for intestinal toxemia CALCIUM-CONTAINING ANTACIDS • dependent upon their basic properties • raise stomach pH to 7 • constipating • found in combinations with magnesium antacids 1. CALCIUM CARBONATE • precipitated chalk • fast action • found in combinations with Mg antacids • in Lozenges and Oral suspension 2. TRIBASIC CALCIUM PHOSPHATE • Precipitated Calcium Phosphate‚ Tertiary Calcium
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Grignard Reaction: Synthesis of Triphenylmethanol Dominic DiRaimo Lab Partners: Roxana Hernandez Somata Thach TA: Sreya Mukherjee December 5‚ 2013 Introduction Grignard reagents are good nucleophiles as well as strong bases (Weldegirma). It allows compounds to react with acidic compounds‚ therefor is must be free from acids as well as water during the desired reaction. Another important aspect of Grignard reagent is that refluxing is necessary to
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Training Schedule for In plant Training It was magnificence 22 (From 24 Sep to 22 oct 2011) days training period in The IBN Sina pharmaceutical Industry Ltd. |Sl No. |Section |Date |Duration (Day) | |01 |Liquid |24‚25 Sep-2011 |2 | |02 |Tablet
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Magnesium General Information of The Element Magnesium is the twelfth element on the periodic table. The atomic number is 12‚ and its atomic mass is 24.305. Magnesium’s boiling point is at 1090C or 1994F‚ and its melting point is at 650C or 1202F.Its state of matter is solid. It is located in the second group called the alkaline earth metals. Magnesium is found in seawater‚ salty layers and in many rock minerals. IT could be used as metal. It’s the third most abundant structural metal
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Hypothesis The hypothesis of this experiment is magnesium oxide can be synthesized by combining (burning) the magnesium with oxygen. The chemical and physical properties of each element (magnesium‚ oxygen‚ and magnesium oxide) might be different‚ from the state‚ color‚ electrical conductivity‚ and pH. Aim This experiment was performed to synthesize magnesium oxide by direct combination of magnesium and oxygen and to compare the properties of the elements (magnesium and oxygen) in their elemental state with
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