Lab report: Empirical Formula of Zinc Iodide Rawan Elbadawy Chemistry 110 Laboratory Introduction A group of researchers were asked to find the empirical formula of Zinc Iodide. O water while trying to prove the conservation of mass. Mass of 4.3x10mol of lead The percent yields were as follows; Iodine 68.5% and Zinc 52.9%. u INTRODUCTION TO ZINC: Zinc has its origin form the German word “Zin” which means Tin.Zinc is found in the group IIb in the periodic table.Zinc is a transition metal having a lustrous blue white appearance. (i) The atomic radii of the metals of the third (5d) series... A: (i) 4 Determination of a Chemical Formula The Reaction of Iodine with Zinc ((use THIS for the second trial in Hess’s Law Lab)) Purpose: The purpose of this lab is to determine the balanced chemical equation for the formation of zinc iodide as well as the chemical formula of the compound from the mole ratio while trying to prove the conservation of mass. Post-lab questions for Synthesis and Decomposition of Zinc Iodide Be sure the answers to these questions appear in the appropriate section your formal report! I think higher, am I correct? If these are missing you will lose points on your report! If at the end of the reaction some of the unreacted zinc escaped from the evaporating dish, the mass of the dish plus the unreacted zinc would be lower than it should be. &. Introduction: Describe how this experiment relates to any two of the following concepts: law of conservation of mass, ions, percent yield, limiting reagents, stoichiometry (reactant mass versus reactant moles), chemical reaction, oxidation states. 1s Calculate the mass of iodine and zinc reacted and produced along with mass and mole. 8 q ¬ S T U V ˜ ™ ö ÷ ñ = ÷ ò ò ò ò ò ò ò è è İ è è Õ Õ Õ Õ Ğ Ğ Ğ Å Å How well do your results agree with the Law of Conservation of Mass (use percent difference to compare)? Get step-by-step explanations, verified by experts. c. Net Ionic Equation: Ò Ò Ò ƒ Ò Ò Ò Ò ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÿÿÿÿ ÷! This preview shows page 1 - 2 out of 4 pages. • View Available Hint(s) à † h Ò Ò N Ò Ò Ò Ò Ò ( ( . Swirl to dry remove from heat when it appears dry and let cool for 10 to 15 minutes, 19. Lab7-Determination of Chemical Formula Zinc Iodide.pdf, University of Texas, San Antonio • CHE 3643, Expt 2. Ò Ò Ò Ò Ò Ò Ò Ò Ò € ‰ : Synthesis and Decomposition of Zinc Iodide Formal Report Information Be sure to look over your “Molar Mass of Magnesium” formal report and correct any style and content errors in this week’s formal report. If at the end of the reaction some of the unreacted zinc escaped from the evaporating dish, the mass of the dish plus the unreacted zinc would be lower than it should be. Why or why not? Synthesis of Zinc Iodide Jessica Edwards Chem 104 Section 30 Performed: 9/4/2007 Submitted: 9/11/2007 Abstract: The objective of the experiment was to determine the formula of zinc iodide and properly figure out the percent yield of zinc and iodine. what elements are present)? If at the end of the reaction some of the unreacted zinc escaped from the evaporating dish, the mass of the dish plus the unreacted zinc would be lower than it should be. To find the empirical formula, Zinc metal with elemental Iodine will need to be reacted to create the compound of Zinc Iodide. E F ë ì í î t Place unreacted zinc in flask back on the hot plate to dry, 18. You can use the “Writing a Formal Lab Report” handout to remind you of the expectations for each section and the overall format. Why or why not. DO NOT POUR OUT THE SOLID ZINC, 15. Would this cause the calculated mass ratio, g I/g Zn, to be higher or lower than the value predicted? Also, remember to summarize important data in a table and show two example calculations (one in words and one with numbers) within your formal report. At the ordinary room temperature, the appearance of zinc is crystalline and brittle. \ 3f Find answers to questions asked by student like you. *While in fume hood* add 25 mL of methanol, Place on hot plate set temp low (pre warmed) (need to boil Methanol), 10. Swirl flask contents for 15-20 min. Would this cause the calculated mass ratio, g I/g Zn, to be higher or lower than the value predicted? What errors might have led to any violation of the Law? Experimental: Why is the reaction of Zn + I2 run in weakly acidified water? 8x10 antimony atoms S T V Ê â ÷ - 1 4 P Q ñ ‚ ¦ ô ö óïëçëïãßãßãÛã×ïÓ×ÓÏÇ¿Ï»ÏÓ×Ó³¯ÓÏÓ« hMy; h>… hij hij H*hœ/u h´*… hƒ >*hœ/u hƒ >*hƒ hij hİ hDu¢ h¿>C hm14 h`Rİ h÷q h‚_ h‚_ h‚_ >*CJ aJ ! Ú ( Ã Ò Ò Ò Ò Ò ( à à ÷ ÷ Û = N N N Ò Ã ÷ à ÷ N Ò N N V  @ † ÷ ÿÿÿÿ nğæÉ × è Zinc Iodide Reaction Lab.docx - 4 Determination of a Chemical Formula The Reaction of Iodine with Zinc(use THIS for the second trial in Hesss Law Lab, 5 out of 6 people found this document helpful, Purpose: The purpose of this lab is to determine the balanced chemical equation for the, formation of zinc iodide as well as the chemical formula of the compound from the mole ratio. solution will be brown when done, 11. Determination of a chemical formula (zinc iodide) CHE145 Lab Notes & Prelab Assignment, University of Wisconsin Colleges • CHE 145. Repeat step 15 a total of three times, 17. W *, Q: Which of the following is not an element? Remove from hot plate when done (will be hot), 14. This is a lab question, referring to zinc and iodine reacting to form zinc iodide. This is a lab question, referring to zinc and iodine reacting to form zinc iodide. lithium molec... Q: How would you account for the following? Conclusion: Discuss 2 possible sources of error. Explain why or why not. Mass of 3. Wh... Q: 1) Calculate how much 95% ethyl alcohol will be required to dissolve 0.75 g of Sulfanilamide at 78℃ ... A: From the graph, the solubility of sulfanilamide at 78◦C = 180 mg/ml X 1. a. Introducing Textbook Solutions. Guide solution into the beaker with the glass stirring rod (so that it doesn’t run down the, side of the flask) *still under fume hood*. 3. your lab report, you will use Excel to calculate the average mole ratio and the empirical formula of zinc oxide from the class data. Be sure the following questions and calculations are shown in your report. Full Ionic Equation: For a limited time, find answers and explanations to over 1.2 million textbook exercises for FREE! Therefo... Q: Give logical fragmentation reactions to account for the following ions observed in these mass spectr... Q: NaHCO3(aq) + AgNO3(aq)
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