Nicholas Acevedo Chem 216 Lab T/Th 8-10:50 Mr. Torres January 31‚ 2013 Experiment 2 Kinetics of H2O2 Decomposition Introduction When measuring the rate of a reaction one can measure the rate at which one of the product appears or the rate at which the reactants disappear. The actual rate of a chemical reaction however is dependent on two things; the temperature the actual experiment is performed at‚ and the concentration pertaining to the reactants. The rate of a reaction more often
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rate constant (k). Activation energy was also determined‚ and the effect of catalyst was evaluated in the reaction between peroxodisulphate ion S2O82-‚ and iodide ion‚ I-. S2O82-(aq) + 3 I-(aq) --> 2 SO42-(aq) + I3(aq) The general expression for the rate law‚ given this overall reaction‚ is: rate of disappearance of S2O82- = k[S2O82-]m[I-]n Chemical Kinetics is the chemistry of how fast or slow something is. These rates of reaction or the speed depends on many factors. Experiments show that the
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potassium iodate in the presence of potassium iodide. Vitamin C‚ more properly called ascorbic acid‚ is an essential antioxidant needed by the human body (see additional notes). When iodate ions (IO3−) are added to an acidic solution containing iodide ions (I−)‚ an oxidation-reduction reaction occurs; - the iodate ions are reduced to form iodine Burette containing potassium iodate solution IO3− + 6 H+ + 5 e− → ½ I2 + 3 H2O - while the iodide ions are oxidised to form iodine. 2 I− → I2 + 2
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[ANS] The condition of part C is different from part B in which it’s in an alkaline medium in contrary to acidic medium in part B. The OH- will combine with Mn3+ to form insoluble Mn(OH)3 which unfavours this reaction. Part D: Vanadium Ion (hydrated) VO3- / VO2+ VO2+ V3+ V2+ Colour yellow blue green violet Oxidation State +5 +4 +3 +2 Test Observations Summary of reaction NH4VO3 + acid white solid dissolved to a yellow solution V(V) + Zn solution changes from yellow via green
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EXPERIMENT NO. 15 PROTEIN CHARACTERIZATION BY ELECTROPHORESIS Abstract The molecular weights of protein extracts were assessed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). Two sets of four protein samples‚ standard bovine serum albumin (BSA)‚ invertase‚ egg albumin‚ and casein‚ were prepared; one set containing β-mercaptoethanol (BME) while the other did not. These were then analyzed through SDS-PAGE with 12.5% resolving gel‚ prepared using 2 M Tris-HCl at pH 8
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SCIENCE RATIONALE This syllabus is prepared with a view to address new trends in integrated science teaching and science teacher education. Science has gained world-wide acceptance as a course of study for various reasons such as the concern for social relevance and environmental issues. The teacher is seen‚ as the key to the success of the Educational Reform in Zambia and the effective implementation of the science curriculum will thus depend on the commitment‚ competence and resourcefulness
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and it is a reaction between acidified hydrogen peroxide and potassium iodide: 2H+(aq) + 2I¯ (aq) + H[-1] 2O2 (l) ÕI2 (aq) + 2H2O2 (aq) Iodide ions are firstly oxidised by the hydrogen peroxide‚ as shown in the above equation. The iodine that is then produced reacts immediately reacts with thiosulphate ions as follows: I2 (aq) + 2Na2S2O3 (aq) Õ 2NaI (aq) + Na2S406 (aq) As soon as all of the thiosulphate ions have reacted with the iodine‚ the excess iodine molecules react with
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Filiz‚ N.A. Sayar and A.A. Sayar‚ Hydrometallurgy‚ 2006‚ 81‚ 167–173. 6. ^ Yoshinari Baba‚ Minako Iwakuma and Hideto Nagami‚ Ind. Eng. Chem. Res‚ 2002‚ 41‚ 5835–5841. 7. ^ J. M. Sánchez‚ M. Hidalgo‚ M. Valiente and V. Salvadó‚ Solvent Extraction and Ion Exchange‚ 1999‚ 17‚ 455–474. 10. ^ P. Giridhar‚ K.A. Venkatesan‚ T.G. Srinivasan and P.R. Vasudeva Rao‚ Hydrometallurgy‚ 2006‚ 81‚ 30–39. 11. ^ K. Takeshita‚ K. Watanabe‚ Y. Nakano‚ M. Watanabe (2003). "Solvent extraction separation of Cd(II) and
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17. In a sample of solid Al(NO3)3‚ the ratio of aluminum ions to nitrate ions is (1) 1:1 (2) 1:2 (3) 1:3 (4) 1:6 19. What is the total number of atoms in (NH4)2SO4? (1) 10 (2) 11 (3) 14 (4) 15 22. Write the correct formula for the following binary ionic compounds. (a) Lithium fluoride LiF (b) Calcium oxide CaO (c) Aluminum nitride AlN (d) Beryllium chloride BeCl2 (e) Potassium iodide KI (f) Aluminum oxide Al2O3 23. Write the correct formula for the following binary molecular
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sufficiently rinse the cleaned test tube with DI water. Methylene chloride‚ CH2Cl2‚ which is a non-polar organic compound was added to the solution reacted with the iodide in the solution to form a violet coloured layer of denser solution‚ which settled at the bottom of the test tube. An alternative means of testing for the presence of iodide anions would have been to use starch‚ which forma a characteristic blue-black
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