Percent Copper and Formula of a Copper Compound Sofia Economides Date Preformed: 3/19/2012 Date Submitted: 3/26/2012 Lab Partners: Anita Smith‚ Taylor Bell‚ Derek Bourgeois 1. Purpose a. To determine the percent of copper and the formula weight of a copper compound. 2. Introduction a. Magnesium is a very active metal which can reduce copper (II) ions in a weight sample of a compound to metallic copper. The reduction of copper ions in a compound to a copper metal
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NO-3(aq)+Na+(aq) • Cu(NO3)2(aq)+NaOH(aq) → Cu(OH)2(s)+ NO-3(aq)+Na+(aq • Ni(NO3)2(aq)+NaOH(aq) → Ni(OH)2(s)+ NO-3(aq)+Na+(aq) • Al(NO3)2 (aq)+NaOH(aq) →Al(OH)(s)+ NO3-(aq)+Na+(aq) • Al(NO3)2 (aq)+NH4OH(aq) →Al(NH4)6+ (s)+ NO3-(aq)+Na+(aq) • Mn(NO3)2 (aq)+NaOH(aq) →Mn(OH)2(s)+ NO3-(aq) +Na+(aq) • Pb(NO3)2 (aq)+H2S(aq)↔PbS2(s)+ S2-2(g)+NO3-(aq) • Ag(NO3) (aq)+H2S(aq)↔ AgS2(s)+ S2-2(g)+NO3-(aq) • Ba(NO3) (aq)+H2S(aq)↔No reaction existed • Fe(NO3)2(aq)+H2S(aq)↔ Fe2S3(s)+ S2-2(g)+NO3-(aq) • Cu(NO3)2(aq)+H2S(aq)↔
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CU represent the increase in absorbance (at 400 nm) per minute in the total assay volume where catechol is the substrate. The activity was then converted to the relative activity of catechol (in CU/μL)‚ relative activity represents the CU over the volume of enzyme added. The data obtained was then used to generate an Eadie-Hofstee plot to display the kinetic trend of
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Empirical Formula of Copper (II) Chloride Gabriella Jane Lukas B1401404 HELP University Empirical Formula of Copper (II) Chloride Objectives 1. To validate that the empirical formula of copper (II) chloride is . 2. To calculate the percent composition of copper in copper (II) chloride. 3. To illustrate the Law of Constant Composition in copper (II) chloride. 4. To study the reaction between copper (II) chloride solution and aluminium metal. Introduction One of the most fundamental statements
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lengths. CU carried a 10% share of the boys’ / men’s’ casual/athletic socks (approximately 3‚700‚000). The margins for CU were less than 20%. To get higher gross margin‚ CU had to venture into new business – branded socks. . It was very difficult for CU’s brand to compete with competitors’ established brands without unique product characteristics. For this purpose‚ deodorizing socks could be a reasonable physical feature for differentiating the product from other competitors’ products. CU began to
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the! copper(ions(that(are(then(reduced(to( metallic(copper.!!! !Zn(s)!+!Cu2+(aq)!→!Zn2+(aq)!+!Cu(s)!! ! ( ( STANDARD(REDUCTION(POTENTIALS(( •! Different)oxidants)and)reductions)have)varying)levels)of)“strength”)and)this) ultimately)determines)if)a)reaction)will)take)place.)) •! There)are)two(basic(rules(that)define)this)concept:)) 1.! Metals(s)(will(displace)(and)thus)react))metal(ions(above.)) !! E.g.)Cu(s))will)displace)Ag+(aq))) 2.! Halogens(g)(will(displace)(and)thus)react))halogen(ions(below
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system. Cognitive users(CU) compete for limited resources in an opportunistic manner by interacting with each other for access to the available resources. In CR networks‚ proper power controlling is important to ensure efficient operation of both primary and cognitive users. In this paper‚ an algorithm is used to dynamically control transmission power‚ which is capable of achieving reasonably good solutions fast enough in order to guarantee an acceptable level of performance for CU without degrading
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CHAPTER 8: ACID – BASE EQUILIBRIUM 4 U CHEMISTRY P 526 – SEE KEY IDEAS - examples f acids and bases. 8.1: The Nature of Acid – Base Equilibria: - Arrhenius acids – H ions in water‚ bases – hydroxide ions in water - acids – sour‚ turn blue litmus to red (pink)‚ conduct electricity - bases – bitter‚ soapy taste‚ slippery‚ conduct electricity‚ turn red litmus to blue Bronsted – Lowry Theory: - acids – donate proton‚ bases accept proton - ex: HCl donates proton to water
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I-XX I. Introducere Această lucrare este un proiect universitar‚ profesional și personal deopotrivă și își propune să prezinte aspecte teoretice și practice din zona comuncării non-verbale și a implicațiilor acesteia în viața de zi cu zi a oamenilor de ieri și de azi. Știm că “La început a fost cuvântul” și mai știm că “O imagine face cât o mie de cuvinte”. Între aceste două parabole ale existenței noastre ne definim ca oameni și ca societate. Ce vorbim este o parte a mesajului
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solution. (a) The solubility of Cu(OH)2(s) is 1.72 x10–6 g/100. mL of solution at 25° C. (i) Write the balanced chemical equation for the dissociation of Cu(OH)2(s) in aqueous solution. Cu(OH)2 Cu 2+ + 2 OH – (ii) Calculate the solubility (in mol/L) of Cu(OH)2 at 25 °C. (1.72 x10–6 g/0.100 L)(1 mol/97.5 g) = 1.76 x10–7 mol/L (iii) Calculate the value of the solubility-product constant‚ Ksp‚ for Cu(OH)2 at 25 °C. Ksp = [Cu 2+][OH –]2 = [1.76 x10–7][3.53
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