LAB REPORT Group: 6 Section: Group member: Phạm Thanh Thủy ID: BTARIU12005 Course name : GENERAL CHEMISTRY LABORATORY Period : 2012-2013 Date performed : 11-03-2013 Date submitted : 02-05-2013 INSTRUCTOR’S NAME : Hoàng Lê Sơn EXPERIMENT 1: CHEMICAL REACTIONS I. INTRODUCTION – OBJECTIVES In this first experiment‚ we will perform 8 chemical reactions and 1 flame test in order to determine 2 things : a) firstly‚ we can know
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Chemistry Stage 3 Standards Guide Exemplification of Standards through the 2010 WACE Examination Chemistry: Stage 3 Standards Guide 1 2010/33606 Copyright © Curriculum Council‚ 2011 This document—apart from any third party copyright material contained in it—may be freely copied‚ or communicated on an intranet‚ for noncommercial purposes by educational institutions‚ provided that it is not changed in any way and that the Curriculum Council is acknowledged as the copyright owner. Copying
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of Al(OH)3 is A. 1.1 x 10-4 mol/L B. 3.3 x 10-4 mol/L C. 1.1 x 10-3 mol/L D. 3.3 x 10-3 mol/L 13. A solution of .15 M cyanic acid (HOCN) a weak acid has pH 2.14 at 250C.What is the acid ionization constant Ka for this acid at 250C.What is the degree of ionization of this acid in this solution? 14. Benzoic acid ‚ HC7H5O2 is a weak acid having Ka= 6.3 X 10-5 at 250C.Determine the equilibrium
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Ma’am Arlou Angeles September 23‚ 2013 I. Abstract The acidity of the four unknown solutions were determined with the use of colorimetry using McIlvaine’s buffer solutions varying in proportion of its constituents (disodium phosphate and citric acid). These buffer solutions were subjected to the addition of corresponding pH indicators and the variation of colors depending on its pH level was used as standards. At the end of the experiment‚ the colors of the unknowns were compared with the standard
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solubility product constant (Thorne‚ 90). This constant is important because it does not change at a given temperature‚ regardless of the solution a compound is in; a smaller constant would indicate lower overall solubility. It is important to note that comparing the Ksp values of two or more compounds can only be done if the compounds share the same dissociation stoichiometry. In this experiment‚ 1 mol of Ca(OH)2 is used to produce 3 mol of products. In order to compare this constant to another compound
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be which of the following? N2(g) + 3H2(g) 2NH3(g) + 94 kJ a. 6.8 d. 8.8 b. 6.4 e. 9.2 c. 8.6 ____ 5. A closed flask contains this equilibrium 2 NO2(g) (brown gas) N2O4(g) (colourless gas) When the equilibrium is heated at a constant pressure it gets browner. This must mean which of the following? a. Ke is very large d. both a and b b. it is endothermic e. both a and c c. it is exothermic ____ 6. Which equilibrium shows a decrease in [products] when the volume
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1) At equilibrium‚ __________. A) all chemical reactions have ceased B) the rate constants of the forward and reverse reactions are equal C) the rates of the forward and reverse reactions are equal D) the value of the equilibrium constant is 1 E) the limiting reagent has been consumed 2) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? HF (s) + H2O (l) ⇌ H3O+ (aq) + F- (aq) A) [HF][H2O] / [H3O+][F-] B) 1 /[HF]
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An investigation into the total acid content of assorted brands of lemon and lime soft drink Abstract: The aim of this experiment was to determine the total levels of carbonic acid concentration in 3 differing brands of lemon and lime soft drinks. Research Question: Does the acid content in three different lemon and lime flavoured soft drink brand differ significantly? The purpose of this investigation is to calculate the total acid content within different brands of lemon
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dilution affect the number of moles of a substance? * What is the general form of a rate law? Rate = k[A]order – what is an order? Can you solve for k given rate‚ [A]‚ and order of A?\ * What does a rate order of zero mean? Equilibrium Constants and Le Chatelier’s Priciple * What is Le Chatelier’s principle? What does it describe? * Be able to use chemical reactions to show Le Chatelier’s principle in action. Example question: The two different colored Co(II) complex ions‚ [Co(H2O)6]2+
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ACIDS USES acetic acid food preservation and preparation‚ when in solution with water it is known as vinegar acetylsalicylic acid pain relief‚ fever relief‚ to reduce inflammation‚ known as aspirin ascorbic acid antioxidant‚ vitamin‚ also called vitamin C Carbonic acid carbonated drinks‚ involved in cave stalactite and stalagmite formation and acid rain Hydrochloric acid digestion as gastric juice in stomach‚ to clean steal in a process known as pickling‚ commonly called muriatic
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