Place a thermometer in the ethanol and record the temperature. At 1150 °C, zinc iodide vapour dissociates into zinc and iodine. Once the liquid is colorless, carefully pour the liquid into the 22 x 175 mm test tube that you weighed in step 2. So this reaction does not affect the overall “chemical bookkeeping” in the chemical equation since ZnI2 is the final product. Do radioactive elements cause water to heat up? Measure the mass of the tube + zinc iodide when the tube is still warm, but not too hot to touch. Textbook Solutions Expert Q&A Study Pack Practice Learn. Once again, make sure you don’t pour any Zn metal pieces over with the liquid.

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Don’t heat the test tube directly in the flame. Smithsonite + Hydrogen Iodide = Zinc Iodide + Water + Carbon Dioxide . There are also a number of practical questions in running a reaction and obtaining products that are not answered by the balanced chemical equation: 1. Measure and record the mass of this test tube + boiling stone(s).

Are the colors you observe characteristic of zinc and iodine? How to write a reaction for adding HCl to a buffer solution? It is used in industrial radiography, as an x-ray opaque penetrant. Stir carefully, using the thermometer, to dissolve the iodine.

Molecular ZnI2 is linear as predicted by VSEPR theory with a Zn-I bond length of 238 pm. This can be speeded up by placing the watchglass on a beaker containing some hot water. Use uppercase for the first character in the element and lowercase for the second character.

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Zinc Nitrate + Potassium Iodide = Zinc Iodide + Potassium Nitrate, ZnSO4*7H2O + Na2CO3 = Na2SO4 + ZnCO3 + H2O. Are the results consistent with the Law of Conservation of mass? ~F � � Ö Ö 4 ÏF ° ° ° � � Ö � Ö XF ° XF ° ° Š xB � � dE Ö Ê €T€CÆÈ : œ � ”C " XF åF 0 G ¶C ® ÏJ * j ÏJ D dE ² ² � � � � dE ÏJ � xE à ° ~F ~F ² ² ä – ¤ ” ² ² – Synthesis and Decomposition of Zinc Iodide Objectives: Synthesize and isolate zinc iodide by reaction of the elements Observe differences in physical properties that distinguish the substances in this reaction Use the data to verify the Law of Conservation of Mass and to calculate the empirical formula of the product. Obtain a 22 x 175 mm test tube and place one or two boiling stones in it. Molar Mass of C2H3AgO2 Oxidation State of C2H3AgO2. This leaves pure ZnI2(s), the product of the main chemical equation, once evaporation of the water and acetic acid is complete. Note the physical properties (color, luster, physical state) of zinc and iodine at the very start of the reaction. or by reacting zinc with iodine in aqueous solution: Zinc iodide Names IUPAC name. Zinc iodide is a chemical compound of zinc and iodine, ZnI 2. Water is not a substance in the overall reaction, but its presence is one of the conditions needed for the reaction to occur at room temperature. Use uppercase for the first character in the element and lowercase for the second character.

Set aside for use later in the experiment. Reactants. How can pure zinc iodide be isolated from this mixture? Two physical properties of Zn metal Two physical properties of I2 c. Color of the liquid in the test tube one minute after reaction started_______ d. Does the color match that of I2(aq) or Zn(I3)2(aq)……………...___________ e. Is the reaction exothermic or endothermic……………………___________ 11. a. Books.

Observe what happens at the electrodes noting particularly any color changes on or about the ends of the wires. Examples: Fe, Au, Co, Br, C, O, N, F. Ionic charges are not yet supported and will be ignored. But if a small amount of water is added to this mixture, some of the I2 molecules will dissolve in the water and move close enough to the Zn metal atoms to react. Zinc Iodide ... enter an equation of a chemical reaction and press the Balance button. Is Zn(I3)2 present at this point in the reaction? Use the percent composition of zinc and iodine to determine the empirical formula of zinc iodide. For example, C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but XC2H5 + O2 = XOH + CO2 + H2O will. Join Yahoo Answers and get 100 points today.

Mass of Zinc iodide………………………………………….____________ c. Two physical properties of zinc iodide: 1. or by reacting zinc with iodine in aqueous solution: Zn + I 2 → ZnI 2.

Make sure you heat the test tube along its length to remove any drops of water. The triiodide ion (I3-) has a distinctive wine-red color that is easy to identify. Measure and record the mass of a clean, dry 20 x 150 mm test tube by laying it sideways on the balance pan. Double Displacement (Metathesis) Reactants. By observing the properties (particularly color) of the substances forming at the electrodes, one can confirm the presence of zinc and iodine in the compound. How well does the calculated empirical formula agree with the accepted value? Silver Acetate + Zinc Iodide = Silver Iodide + Zinc Acetate, ZnSO4*7H2O + Na2CO3 = Na2SO4 + ZnCO3 + H2O.

Hydrogen Iodide - HI.

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