Concentration Dependence of Reaction Rates Introduction: The purpose of this experiment was to determine the differential rate law for a chemical reaction based on the relationship between the concentration of reactants and the rate of reaction. Since spectrophotometers‚ like Spec-20s‚ provide information about concentration‚ these instruments were used to monitor the increase or decrease in concentration of a reactant in a solution over time. By plotting [phph2-] versus time and changing the concentration
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Heat of Combustion of Magnesium Background: The students were given full instructions on how to experimentally determine the enthalpy of reaction (ΔHrxn) for the combustion of magnesium ribbon‚ using Hess’s Law. Data Collection: | |Reaction 1 |Reaction 2 | | |(MgO) |(Mg)
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Purpose Use a standardized potassium permanganate solution to analyze an unknown iron solution by using redox titration. Theory Reduction-oxidation titration is an analytical method based on electrons transferring between an oxidizing agent and a reducing agent in solutions. Chemical analysis can be built on Redox titration if four criteria are met: a) The reaction is completed in a thermodynamically spontaneous condition. b) The reaction is fast enough to give an operational result instantly
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De La Salle University -Dasmariñas College of Science PHYSICAL SCIENCES DEPARTMENT Dasmariñas City‚ Cavite GUIDELINES FOR PRE-LABORATORY AND POST-LABORATORY REQUIREMENTS FOR GENERAL CHEMISTRY A. Introduction Scientific writing is part of the job description of a researcher in the fields of Science‚ Medicine‚ and Engineering. A scientific paper is
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acid solution would be titrated by slowly adding drops of solution into NaOH‚ and the volume of base needed to react with the acid is measured throughout. By using those data‚ the students are able to find what they were trying to calculate. On this lab‚ the students found the unknown acid‚ 4.36 x 10-5‚ and the equivalence point of 8.4‚ as well as the value of pH. Purpose: The purpose of the experiment was to utilize the techniques of titrations to measure the concentration of an acid or base in
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Unit 2 PPA 1 Complexometric Determination of Nickel using EDTA Introduction: The Aim of the experiment is to determine the percentage of nickel salt using a complexometric technique. Ethylenediaminetetraacetic acid (EDTA) is a hexadentate ligand which forms stable complexes with most metal ions‚ thus is widely used to determine metals in complexometric titrations. EDTA can be represented as H4Y and in alkaline conditions‚ it exists as Y+ ions: The Y4- ions form 1:1 complexes with metal ions
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Organic Chemistry I Spring 2013 Practice test 1. Name the following compounds: a. 5-tert-butyl-7-isopropyl-6-sec-butyl-undecane b. cis-2-(5‚6-dimethylheptyl)-6-(3-methylpentyl)piperidine c. trans -2-nonyl-3-octyl-tetrahydrofuran d. trans-1‚6-dimethylbicyclo[4.3.0]nonane e. cis-6‚8-ditert-butylspiro[3.5]nonane f. 1‚6-dimethylcyclohexene g. (Z)-3-bromo-4-fluoro-5-methyl-oct-4-ene h. (E)-8-(1-chloroethyl)nonadec-8-ene 2. Draw the structures of the following compounds: a b e c
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CLC108/CLB108 Tutorial #1 1. 2. Define Cell Theory. Discuss the similarities & differences between prokaryotes & eukaryotes‚ with diagrammatic illustrations. Discuss the similarities & differences between plant & animal cells‚ with diagrammatic illustrations. Describe the Davson-Danielli model of plasma membrane with diagrammatic illustration. State the function(s) of the following cell organelles: (a) (b) (c) (d) (e) (f) 6. Golgi complex Mitochondria Smooth ER Rough ER Ribosomes Lysosome 3.
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Chemistry Student Handout Question & Answers 1. Most drugs are weak acids or weak bases. Is cocaine a weak acid or weak base? Cocaine is a weak base. 2. A weak acid or base can exist in 2 forms—charged (ionized) or uncharged (unionized). What is the major factor that determines whether the weak acid or base is charged or un- charged? The amount of H+ in comparison to OH- 3. In what chemical form (charged or uncharged) is cocaine snorted? Smoked? Why are they different? Cocaine (unionized) is
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Percent Acetic Acid in Vinegar Introduction: Acetic acid is reactive when combined with calcium carbonate. In this lab‚ we will use vinegar for its acetic acid and egg shells for their calcium carbonate. Marketable vinegar differs in its acetic acid concentration from 4-6%. Calcium carbonate reacts with the acetic acid in vinegar to produce carbon dioxide‚ water‚ and calcium acetate as represented by the equation: CaCO3 + 2HC2H3O2 CO2 + H2O + Ca(C2H3O2)2. The calcium carbonate reacts with
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