CBSE Continuous and Comprehensive Evaluation (CCE) Sample Question Papers Solutions Term 1 (April to September 2013) Science Class OSWAAL BOOKS CONTENTS l Solutions q Sample Question Paper 6 q Sample Question Paper 7 q Sample Question Paper 8 q Sample Question Paper 9 q Sample Question Paper 10 1 - 7 8 - 13 14 - 20 21 - 26 27 - 32 ll SAMPLE QUESTION PAPER–6 Section-A 1. Moving charges / electric current / magnet (any two). 2. (i) To develop male secondary sex organs
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Synthesis Procedure 1 -1.0 Introduction A Cobalt-Amine-Halide compound is synthesized from cobalt (II) chloride hexahydrate. An orange-tinted solid is produced and is considered to be unknown since the specific ligand amounts are unknown. By determining the percent composition of various elements and compounds in the unknown‚ its true identity can be predicted. Chloride‚ ammonia‚ and cobalt are three examples of percent compositions determined to help narrow the selection of possible unknowns
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Reactivity starting from the least reactive. Li‚ Na‚ K c) A piece of sodium was dropped in a trough containing water. i) Describe what you would see. Sodium melts almost at once to form a small ball that dashes around the surface. . If the sodium becomes trapped on the side of the container‚ the hydrogen may catch fire to burn with an orange flame ii) Write a word and symbol equation for the reaction. sodium + water → sodium hydroxide + hydrogen 2Na + 2H2O → 2NaOH + H2 iii) what would be the
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evaporation when forming crystals. Phenolic compounds will undergo salt formation with sodium hydroxide solution‚ NaOH.Therefore‚sodium hydroxide solution is allow to use to extract a carboxylic acid or phenolic compound from its solution in an organic solvent.An organic solvent can be used to remove organic impurities from a carboxylic acid or phenol dissolved in aqueous sodium hydroxide.Aqueous solution of Sodium
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will result in an insoluble solid. See method for more detail. It is expected that the following compounds will form precipitates Silver Sulphate‚ Copper Hydroxide‚ Copper Iodide‚ Silver Hydroxide‚ Silver Iodide‚ Cobalt Hydroxide and two Silver Chlorides. This was worked out by completing the double displacement reactions and using a table of solubilities. (See appendix one & two) In any experiment involving chemicals a hard wearing plastic apron‚ safety glasses and closed in leather shoes should
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withstand with high temperature (iii) (b)(i) (ii) (c) (i) H Cl | | C == C | | H H 1 (ii) (iii) Polyvinyl chloride/ polychloroethene polymerization TOTAL 1 1 9 No 2(a) (b) (c)(i) Answer Horizontal row of elements in the Periodic Table of Elements Atoms have 3 shells occupied with electron 1. Correct formulae of reactants and products 2. Balanced equation Cl2 + H2O → HCl + HOCl Sodium Chlorine Red litmus paper blue Blue litmus paper red http://cikguadura.wordpress.com Mark 1 1 1 1 (ii) 2
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PHILIPPINES DILIMAN‚ QUEZON CITY‚ PHILIPPINES DATE PERFORMED: JUNE 21‚ 2013 INSTRUCTOR’S NAME: LISA MARIE S. RAMIREZ INTRODUCTION In all chemical processes‚ heat is either absorbed or released by the chemical system. It can be observed that when sodium hydroxide is reacted with hydrochloric acid‚ the container containing the chemical reaction becomes warmer compared to when only one of the reactants is in the container. This simple observation can lead to the conclusion that heat is absorbed by
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Chemical Name Chemical Formula Common Use 1 Sodium hydroxide NaOH Drain cleaner 2 Sodium bicarbonate NaHCO3 Baking soda 3 Aluminum oxide Al2O3 Sandblasting sand 4 Sodium hypochlorate NaClO Bleach 5 Aluminum sulfate Al(SO4)3 Used in antiperspirant 6 Ammonium bromide NH4Br Used in photography 7 Ammonium chloride NH4Cl Used in photography 8 Ammonium carbonate (NH4)2CO3 Smelling salts 9 CaCO3 Limestone/chalk 10 Sodium chloride NaCl Table salt 11 Calcium chloride CaCl2 De-icer for snow on roads 12 Calcium
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sieved until the size of 100 mesh was obtained. The supporting chemical substances such as potassium hydroxide (KOH)‚ sodium hydroxide (NaOH)‚ acetic acid (CH3COOH)‚ calcium nitrate tetrahydrate (Ca(NO3)2.4H2O)‚ toluene (C6H5CH3)‚ chloroform (CHCl3)‚ diethanolamine ((C2H4OH)2NH)‚ sodium chloride (NaCl)‚ diethyl eter ((C2H5)2O)‚ methanol (CH3OH)‚ sodium methoxide (CH3ONa)‚ sodium sulphate (Na2SO4) were used in this study. The materials were laboratory grade (MERCK) and were purchased from CV. Multi
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Neutral Alkaline Neutralisation occurs because: Acid + alkali = salt and water As both salt and water are neutral‚ the resulting chemical is neutral. e.g. hydrochloric acid + sodium hydroxide = sodium chloride + water (HCL + NaOH = NaCl + H₂O) Acidic solutions contain H⁺ (aq) ions. This H⁺ (aq) ion is removed from the solution when the acid is neutralised. Alkaline solutions contain OH⁻ (aq) ions. This OH⁻ (aq) ion is cancelled out
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