the rate of a reaction changes as the one changes the concentration levels. For this experiment we will also be using a catalyst to speed up the production of oxygen gas. The catalyst being used will be iodide ions‚ which will be introduced into the actual reaction through a mixture of potassium iodide‚ KI. Once all the reactions are complete the rate will be found by using the rate law‚ which shows the dependence of the rate of the reaction of both the iodine and the hydrogen peroxide. Procedure
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__________________ CHEMICAL NAMES AND FORMULAS SECTION 9.1 NAMING IONS (pages 253–258) This section explains the use of the periodic table to determine the charge of an ion. It also defines polyatomic ion and gives the names and formulas for the most common polyatomic ions. Monatomic Ions (pages 253–256) 1. What are monatomic ions? Monatomic ions are ions consisting of only one atom. 2. How is the ionic charge of a Group 1A‚ 2A‚ or 3A ion determined? The ionic charge is numerically equal to the group
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determine the structure of the major product. Sodium saccharin is made from the base catalyzed de protonation of saccharin. This nucleophilic reaction is special because the nucleophilic atom can be oxygen or nitrogen and the leaving group is iodide ion. The solvent used in this reaction is very important for determining the rate of nucleophilic substitution reaction. Polar protic solvents such as water and ethanol result in bulky solvation shells around the charged nucleophile; this is what
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OXIDATION-REDUCTION TITRATIONS REDOX TITRATION • involves oxidizing agents and reducing agents titrants and analytes • oxidizing agents used as standard solutions: potassium permanganate‚ KMnO4 potassium dichromate‚ K2Cr2O7 iodine‚ I2 ceric sulfate‚ Ce(SO4) 2 potassium iodate‚ KIO3 REDOX TITRATION • reducing agents used as standard solutions: ferrous sulfate‚ FeSO4 oxalic acid‚ H2C2O4 sodium oxalate‚ Na2C2O4 sodium thiosulfate‚ Na2S2O3 titanous chloride
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DOWNLOADED FROM WWW.STUDIESTODAY.COM DOWNLOADED FROM WWW.STUDIESTODAY.COM d – AND f – BLOCK ELEMENTS Electronic Configuration of Transition Metal/Ions The d-block element is called transition metal if it has partly filled d-orbitals in the ground state as well as in its oxidised state. The general electronic configuration of transition metal is (n–1) d1–10ns1–2. Exceptions in electronic configuration are due to (a) very little engery difference between (n–1) d and ns orbitals and (b) extra stability
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Abstract The aim of the experiment is to test the existence of macromolecules which are carbohydrates‚ lipids‚ nucleic acids and proteins in given samples. The first experiment is to test the existence of carbohydrates in starch suspension and potato cell. If carbohydrate is present in starch suspension‚ the solution will turn into dark blue when iodine solution is added. If carbohydrate is present in potato cell‚ starch granules can be seen clearly under microscope when iodine solution is added
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orange colour of the solution turns into green. Cr2O72-: dichromate(VI) ion (Orange) C2O42-: ethanedioate ion (Colourless) Cr3+ : Chromium(III) ion (green) Potassium Manganate(VII) with Ethanedioic Acid 2MnO4- + 16H+ + 5C2O42- ⎯→ 10CO2 + 8H2O + 2Mn2+ Notes: 1. Mn2+ is colourless 2. In the reaction‚ the purple colour of the solution turns into colourless. MnO4-: Manganate(VII) ion (Purple) Mn2+: Manganese(II) ion colourless Decomposition of Hydrogen Peroxide 2H2O2 - ⎯→ 2H2O + O2
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Lead (II) Iodide Synthesis and Percent Yield NAME:__________________________________________________ PERIOD:______ Prelab 20.0 mL of 0.150 M potassium iodide and 10.0 mL of 0.200 M lead (II) nitrate are mixed together. 1. Write the net ionic equation describing the reaction. 2. Calculate the theoretical yield. Show calculations. 3. a) If a student obtains 0.890 g of lead(II) iodide‚ calculate the percent yield? Show calculations.
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was present. A red precipitate means glucose is present in vast amounts. Food Test 2: Test for Starch – with Iodine solution. Iodine solution is used to identify the presence of starch- a complex carbohydrate. Iodine solution (potassium iodide solution) reacts with amylase – a type of starch – whereby a blue-black polyiodide complex is formed. Method 1) Mix smalls amount of each food samples (i.e.‚ Egg lumen‚ cylindrical piece of potato tuber‚ bread crump and crisps) in different test
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determine the limiting reagent between the reaction of lead (II) nitrate and potassium iodide. To determine the percent yield of lead (II) iodide. Date Started: 13/4/12. Finished: 19/4/12. Data collection and processing Measurements: * Amount of distilled water: 75.0ml ± 0.5ml. * Mass of watch glass: 31.65g ± 0.01g. * Mass of watch glass + potassium iodide: 32.45g ± 0.01g. * Mass of potassium iodide: 0.8g ± 0.02g. * Mass of watch glass + lead (II) nitrate: 32.66g ± 0.01g. *
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