Summative Assessement-1 Examination 2014 Science Class – X Time allowed: 3 hours Maximum Marks: 90 General Instructions: a) b) c) d) e) f) g) h) 1. 2. 3. 4. 5. 6. 7. The question paper comprises of two sections‚ A and B. you are to attempt both the sections. All questions are compulsory. Questions 1 to 3 are one mark question of section A. Questions 4 to 6 carry two marks each of section A. Questions 7 to 18 carry three marks each of section A. Questions 19 to 24 carry five marks each of section
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best example is the mixing of acidic substances and basic substances‚ to change break the orginal bond in order to create a new one. What evidence did you use to decide that something was a chemical change? As I mentioned earlier‚ we combined an acid and a base when mixing multiple solutions‚ that is the best evidence available. Give at least two examples of chemical changes you observed. 1. Diluting MgO with HCl 2. Diltuing NaCl with HCl Classify the following properties of sodium metal as physical
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I. Introduction The purpose of this experiment is to determine the pH values of acids‚ bases‚ and buffers of distilled water and 10.0 buffer using measured concentrations of Sodium hydroxide (NaOH) and/or Hydrochloric acid (HCl). Acid is a compound typically having a bitter taste and capable of nullifying alkalis and releases hydrogen ion when added to a solution‚ or containing an atom that can accept a pair of electrons from a base (McKinley‚ Dean O’Loughlin‚ & Stouter Bidle‚ 2016). Bases are water-soluble
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Experiment 1 Titration curves of amino acids General structure of amino acids (amphoteric type): Zwitter ion C * : α- carbon : α- amino acid NH2 : α- amino group‚ basic (proton acceptor) COOH : α- carboxylic group‚ acidic (proton donor) R : side chain of amino acid Classification of amino acids depending on the nature of side chain:
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Acid Rain Webquest Name: ________Jacob Rough_________________________ Date: _____3/25/13________ Sulfur dioxide and nitrogen oxides are gases released by the burning of fossil fuels. These gases can react with water and oxygen to form acids. Normally‚ rainwater is slightly acidic. But the additional acid that enters the air when fuels are burned makes it even more acidic. Acid rain can have a harmful effect on fish and other wildlife and upsets the delicate balance
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Title: Estimation of Ascorbic acid Aim: To determine the ascorbic acid content of canned apple and orange juice To determine the volume of canned juice necessary to provide 75mg of Vitamin C Introduction: For the estimation of ascorbic acid‚ the method used involved the titration of the ascorbic acid‚ in the presence of a redox indicator 2‚6-dichlorophenol-indophenol (DCPIP) which acts as both an oxidant so as to oxidise the ascorbic acid to dehydroascorbic acid‚ and it acts as an indicator
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Abstract In this experiment paper chromatography was used in order to identify two unknown amino acids using eight known amino ones. The two unknown ones were identified by comparing the distance they travelled up the chromatography paper and their Rf values to the corresponding values of the other eight known amino acids. The unknown amino acids identified were Glycine and Methionine. Introduction Proteins in cells are important in many ways. There are different types of proteins such as
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Figure 1: Formation of benzocaine from p-aminobenzoic acid Experimental P-aminobenzoic acid (1.211g) and absolute ethanol (15mls) were combined with three boiling chips in a 50ml round bottom flask. The round bottom flask was placed on a heating plate and was refluxed starting at 109 ̊C. The solution began boiling at 111 ̊C. It was allowed to reflux for approximately 30 minutes and the solid was dissolved. The round bottom flask was then placed in an ice bath and allowed to cool to
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above experiment in order to see a visible color change in the solution? At what pH would the solution have been neutral? Question #4 If you had walked into the lab‚ only to discover that you only had 0.1 M sulfuric acid available to run you tests‚ how might this have affected your calculations? Why? Question #5 Balance the following reaction. Al(OH)3 + HCl AlCl3 + H2O Question #6 FDA major findings report
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Acid Rain is a type of air pollution‚ which is formed when oxides of sulfur and nitrogen combine with atmospheric moisture to yield sulfuric and nitric acids‚ which may then be carried long distances from a source before they are deposited by rain. This pollution may also take the form of snow‚ fog‚ or a dry form of precipitation. Acid rain is currently a subject of great controversy because of widespread environmental damage‚ for which it has been blamed‚ including eroding structures‚ injuring crops
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