Scribd Extrascore Sample Questions - Answers Q.1: What are the µlaws of chemical combination¶? Ans: There are two important laws of chemical combination established by Lavoisier‚are as follows: (i) Law of Conservation of Mass The law of conservation of mass states that mass can neither be created nor destroyedin a chemical reaction.(ii) Law of Constant Proportions The Law of Constant Proportions which is also known as the Law of DefiniteProportions‚ was established by Proust
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Last Name ____________________First Name _______________________ Ignore: 5‚ 7‚ 19‚ 30 1. | How many grams of CaCl2 (molar mass = 111.0 g/mol) are needed to prepare 4.44 L of 0.500 M CaCl2 solution? | | A) 369 g B) 271 g C) 258 g D) 296 g E) 246 g | 2. | An aqueous solution of ammonium sulfate is allowed to react with an aqueous solution of lead(II) nitrate.The complete ionic equation contains which of the following species (when balanced in standard form)? | | A)
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T.I.T COLLEGE OF PHARMACY ANAND NAGAR‚ BHOPAL 2009-2010 INDUSTRIAL TRAINING REPORT ON SCHON PHARMACEUTICALS Ltd. INDORE ( M.P ) SUBMITTED BY SUBMITTED TO WASIM AHAMAD 0150PY061057 DR.B.K.DUBEY M.PHARMA‚ Ph.D T.I.T COLLEGE OF PHARMACY Page 1 T.I.T COLLEGE OF PHARMACY ANAND NAGAR‚ BHOPAL (Approved by AICTE ‚ New Delhi and recognized by Govt. of Madhya Pradesh affiliated to RGPV Bhopal) CERTIFICATE This is to certify that Mr.Wasim ahamad Enrollment No.0150py061057
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has been a tremendous increase in the yields of various crops to meet the demand of overgrowing population‚ achieved by using pesticides and insecticides. These are chemicals that are sprayed over crop to protect it from pests. For example‚ DDT‚ BHC‚ zinc phosphide‚ Mercuric chloride‚ dinitrophenol‚ etc. All pesticides are poisonous chemicals and are used in small quantities with care. Pesticides are proven to be effective against variety of insects‚ weeds and fungi and are respectively called insecticides
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Aquatic habitats The variability in marine salinity between habitats does not impact the fish living there True. Which energy pyramid cannot be inverted? Pyramid of energy Which marine habitat would have the least access to primary producers? Deep sea and sea floor Which of the following aquatic environment would not freeze in water Salt marsh Less than 0.1% True The most productive marine habitats are in the open ocean False If a stationary body of water has a constant temperature from
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Chemistry 2283g Experiment 1 – Alkyl Halides EXPERIMENT 1: Preparation and Reactivity of Alkyl Halides Relevant Sections in the text (Wade‚ 7 ed.) • 6.7 (p. 228) Reactions of alkyl halides • 6.8 – 6.12 (p. 229 – 242) The SN2 reaction: generality‚ factors affecting SN2 reactions‚ substrate reactivity‚ mechanism • 6.13 – 6.14 (p. 243 – 249) The SN1 reaction: mechanism‚ stereochemistry General Concepts The most common of the variety of methods available for preparing alkyl halides is the replacement
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` CHEMISTRY PROJECT ON PRESENCE OF INSECTICIDES IN FRUITS AND VEGETABLES A PROJECT REPORT Submitted by VAISHAKH MURALEEDHARAN Class: XII-A JANUARY 2015 DEPARTMENT OF CHEMISTRY SHANTINIKETAN INDIAN SCHOOL DOHA-QATAR SHANTINIKETAN INDIAN SCHOOL‚ DOHA – QATAR Affiliated to the Central Board of Secondary Education‚ Delhi. Approved by the Ministry of Education‚ State of Qatar. BONAFIDE CERTIFICATE This is to certify that this project report entitled “CHEMISTRY PROJECT ON” PRESENCE
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0.160 mol I2 253.8 g I2 = 40.6 g I2 1 mol I2 ii) what percentage yield of iodine was produc ed. 40.6 g I2 x 100 = 79.9 % 50.8 g I2 2. Zinc and sulphur react to form zinc sulphide according to the equation. Zn + S ZnS If 25.0 g of zinc and 30.0 g of sulphur are mixed‚ a) Which chemical is the limiting reactant? 25.0 g Zn 1 mol Zn 1 mol ZnS =.382 mol ZnS 1 65.41 g Zn 1 mol Zn 30.0 g S 1 mol S 1 mol
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Experiment 1: Synthesis of Copper Compounds Introduction This experiment involves the synthesis of compounds originating from pure solid copper. By applying solubility rules and the reactive properties of substances‚ many compounds which would otherwise be costly to extract from nature are able to be synthesized in the laboratory. Laboratory synthesized may sometimes be more economical than natural extraction‚ however it poses its own problems with the amount of substance that is actually yielded
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| 1 | Potassium | K | 1 | Magnesium | Mg | 2 | Zinc | Zn | 2 | Copper | Cu | 2 | Silver | Ag | 1 | Lead | Pb | 2 | Chloride | Cl | -1 | Sulphate | SO4 | -2 | Hydroxide | OH | -1 | Carbonate | CO3 | -2 | Nitrate | NO3 | -2 | Phosphate | PO4 | -3 | Hydrogen Carbonate | HCO3 | -1 | Acids and Bases in the Laboratory Back to Top Some common acids that are found in laboratories are Hydrochloric acid (HCl)‚ Sulphuric acid (H2SO4) and Nitric acid (HNO3). Some
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