Two inquiry-based labs that complement a previously published activity in this journal, the synthesis and decomposition of zinc iodide: model reactions for investigating chemical change in the introductory laboratory, are described these two experiments could be of interest to introductory chemistry. Of zinc iodide back into its elements these reactions are important for chemistry teachers to know about because they can be performed by introductory students to understand different aspects of chemical change such as the concepts of reaction, compound, bonding, excess and limiting reactants, an empirical formula,. Zinc iodide chemical formula zinc iodide is the white solid composed of zinc and iodide it is obtained by the direct reaction of zinc and iodine in refluxing ether it is represented using the molecular formula zni2 it decomposes at the boiling point of 1,150 °c molar mass of zinc iodide is 31922 g/mol it is used in industrial. You should explain the difference between an empirical and a molecular formula and how to calculate both analysis 1 use your data to determine how many grams of zinc reacted and how many grams were left over 2 assuming that all of the iodine reacted, what is the percent composition (by mass) of each element in. Zinc iodide name: zinc iodide formula: zni2 molar mass: 3191889 example reactions: • zn + i2 = zni2 • 2 hi + zn = zni2 + h2 • zn(no3)2 + 2 nai = zni2 + 2 nano3 • 2 na + zni2 = 2 nai + zn • zni2 + 2 agno3 = zn(no3)2 + 2 agi ↓ • zn( oh)2 + 2 hi = zni2 + 2 h2o • zn + 2 agi = 2 ag + zni2 • zni2 + k2co3 = znco3.
Zinc iodide is a chemical compound of zinc and iodine, zni2 the anhydrous form is white and readily absorbs water from the atmosphere it can be prepared by the direct reaction of zinc and iodine in refluxing ether or by reacting zinc with iodine in aqueous solution: zn + i2→ zni2 at 1150 °c, zinc iodide vapour. Zinc iodide is the white solid composed of zinc and iodide it is obtained by the direct reaction of zinc and iodine in refluxing ether. Study chemistry 211 empirical formula of zinc iodide lab report notes. This video is about zinc iodide lab overview.
Adapted from: synthesis and decomposition of zinc iodide: model reactions for investigating chemical change in the introductory laboratory, stephen demeo, j chem educ, 1995, vol 72, no 9, p836 the formula mass of water, h2o , is [2( 10) + 160] or 180 therefore the %, by mass of water that is hydrogen is: 2(10. Once this is complete discard the solution containing the product zinc iodide from chemistry 211 at george mason out too high and too low were the amount of sig figs and the reading of the scale wrong conclusion each group had different empirical formula because they had different numbers of zinc to iodide ratio. You might need to go online to obtain the chemical structures explain the differences in viscosity, solubility in water, and boiling point based on the major intermolecular forces that are present between the molecules in these liquids if soluble in water, make a sketch of the specific interactions between water molecules and.
10 conservation of mass: synthesis and decomposition of zinc iodide this robust lab activity allows students to confirm the conservation of mass, determine the empirical formula of zinc iodide and observe a synthesis and decomposition reaction, which are exothermic and endothermic respectfully ca chemistry content. 5 days ago in the case of your question, the reactants are zinc and iodine, so you are being asked to determine the mass of zinc and the mass of iodine that were consumed to form zinc iodide the balanced chemical equation for this synthesis reaction between zinc and iodine is: zn + i2 → zni2 in order to determine.
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Empirical formula of zinc iodide reference: general chemistry laboratory experiments, suzanne w slayden, 1999, 3rd edition, pages 31-35 purpose: the purpose of this experiment is to determine the empirical formula of the binary compound, zinc iodide procedure and observations: follow the instructions given in the. (used in the preparation of organozinc reagents via transmetalation a mild lewis acid useful for promoting addition and substitution reactions) physical data: mp 446 °c bp 625 °c (dec) d 4740 g cm−3 solubility: sol h2o (1 g/03 ml), glycerol (1 g/2 ml) freely sol etoh, et2o form supplied in: white, odorless, granular. Pubchem cid: 9883512 chemical names: zinciodide zinc(ii)iodide zinc (ii) iodide i2zn zni2 acmc-1bsli more molecular formula: i2zn molecular weight: 319189 g/mol inchi key: uaywvjhjzhqcie-uhfffaoysa-l substance registry: fda unii. Determination of empirical formulas in this lab you will synthesize zinc iodide from zinc metal and solid iodine you will also determine the formula of an unknown hydrate stockroom you will need a hot plate chemicals you will need about 12 g of zinc and about 12 grams of iodine you will also need about 20 ml of 02.