of % Composition of Pennies Using Redox and Double Displacement (Precipitation) Reactions Introduction: Oxidation involves the gain of electrons of hydrogen or the loss of oxygen or decrease in oxidation state. If zinc completely reacts with HCL‚ then the theoretical yield of copper should be equivalent to the actual yield. Purpose: In this lab‚ we will determine the percent composition of a modern (post-1982) penny by using a strong acid to react and dissolve the zinc core‚ leaving only
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organic layer contains the dichloromethane‚ aspirin‚ and the unknown. If the HCl has nothing to react with in the aqueous layer following mixing (i.e.‚ sodium acetylsalicylate)‚ then little to no solid aspirin will be produced. Furthermore‚ more unknown would be produced than expected because aspirin would precipitate with the unknown during distillation. (c) Mistakenly extracting the dichloromethane solution with 5% HCl rather than 5% NaHCO3 would make the solution impure. It would likely not form
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copper (ii) oxide and carbon dioxide: CuCO3(s) arrow CuO(s) + CO2(g) You will test for the formation of copper (ii) oxide and carbon dioxide. Limewater is a sensitive test for CO2‚ forming a distinctive milky precipitate: CO2(g) + Ca(OH)2(aq) arrow CaCO3(s) + H2O(l) APPARUTUS: * fat Pyrex test tubes x 3 * medium Pyrex test tubes x 2 * holed stopper x 1 * bent glass delivery tube x 1 * rubber tubing x 1 * glass tubing x 1 * retort stand x 2 * Bunsen burner x 1 * Safety glasses x 1 * Copper(ii)
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POSITIONING 8 MARKETING MIX 8 Product 8 Price 10 Pricing and Profit Margins 10 Place 11 Promotion 13 Marketing Budget 13 REVIEW AND CONTROL 14 MARKETING ORGANIZATION 14 CONTINGENCY PLAN 14 BIBLIOGRAPHY 15 EXECUTIVE SUMMARY HCL‚ a 35 year old enterprise‚ founded in 1976‚ is one of India ’s original IT garage start-ups. Its range of offerings span R&D and Technology Services‚ Enterprise and Applications Consulting‚ Remote Infrastructure Management‚ BPO services‚ IT Hardware
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UTAR FHSC1134 Inorganic Chemistry Trimester 3 Experiment 1 ________________________________________________________________________ Title: Investigating the Properties of Period 3 Oxides Aim: To examine the oxides of Period 3 elements and describe their structure and bonding. Introduction: Generally‚ there are oxides of metals and non-metals. Metals burn in oxygen to form basic oxides while non-metals form acidic oxides. Structurally‚ they are covalent or ionic compounds. You are to
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moles Moles of HCl in 10ml of 6.0M = 6/1 x 0.01L = 0.06 moles Actual Mole Ratio (AMR) = 0.21/0.06 = 3.5 Equation mole Ratio (EMR) = 1/2 = 0.5 If AMR > EMR then the 2nd reactant‚ i.e. HCl is the limiting reactant and Magnesium is in excess. Hypothesis: Hydrochloric acid will be the limiting react at stages 5 and 6 and Magnesium will be the limiting reactant at stage 7. Procedure: We were given two magnesium ribbons and a beaker of 6M HCl to carry out our
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Observations: Week 1: Standardizing hydrochloric acid using sodium carbonate with bromocresol green indicator Table 1: Titration of sodium carbonate using hydrochloric acid Trial | Mass of Na2CO3 (g) | Burette Reading (mL) | Final Volume of HCl (mL) | | | Initial | Final | | 1 | 0.2123 | 0.00 | 42.34 | 42.34 | 2 | 0.2195 | 0.00 | 47.24 | 47.24 | 3 | 0.2049 | 0.00 | 26.65 | 46.65 | After Boiling | 1 | | 31.52 | 32.22 | 0.70 | 2 | | 29.34 | 30.61 | 1.27 | 3 | | 30.61
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species such as Bacillus spp. provided the right conditions‚ namely‚ an alkaline environment rich in Ca2+ ions. Bacterially induced mineralization has recently emerged as a method for protecting and consolidating decayed construct materials. Calcite (CaCO3) is one of the most common and widespread minerals on the earth‚ constituting 4% by weight of the earth’s crust. Calcite precipitation is a common phenomenon which forms natural
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1: EMPLOYEE ACKNOWLEDGEMENT FORM I understand that this HR Manual provides vital information about Hindustan Composites Limited (HCL). If any of my queries are unanswered by this manual‚ I will consult the HR department for the same. It is rightly said that ’Nothing is constant except change.’ As the information‚ policies and benefits described here are subject to changes‚ I acknowledge that revisions to the handbook may occur over a period of time. I understand that revised information may
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Chemistry Practice Exam and Notes Effective Fall 2013 About the College Board® The College Board is a mission-driven not-for-profit organization that connects students to college success and opportunity. Founded in 1900‚ the College Board was created to expand access to higher education. Today‚ the membership association is made up of over 6‚000 of the world’s leading educational institutions and is dedicated to promoting excellence and equity in education. Each year‚ the College
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