sodium nitrate Cu(No3)2 + 2NaOH à Cu(OH)2 + 2NaNO3 Double Replacement -A solid seems to form 6 Copper(II) hydroxide à copper(II) oxide + water Cu(OH)2 à CuO + H2O Decomposition -The liquid turns black 10 Copper(II) oxide + hydrochloric acid à copper(II) chloride + water CuO + 2 HCl à CuCl2 + H2O Double Replacement -The liquid clears up and turns blue 11 Copper(II) chloride + aluminum à copper + aluminum 3CuCl2 + 2Al à 3 Cu + 2 AlCl3
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CHEMICAL REACTIONS OF COPPER AND PERCENT YIELD Objective To gain familiarity with basic laboratory procedures‚ some chemistry of a typical transition element‚ and the concept of percent yield. Apparatus and Chemicals |0.5 g piece of no. 16 or no. 18 copper wire |evaporating dish | |250 mL beaker (2) |weighing paper | |concentrated HNO3 (4 – 6 mL)
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Cambridge CELTA Written Assignment 1: Focus on the Learners Part A: Student profile: Personal Information: Previous Language Learning Experience: Chien has been studying English for two years‚ of which only the last three months have been at English teaching centres; the rest of her English learning has been self-taught. Because of this‚ her pronunciation and listening skills are not as good as they should be for an intermediate level student. She is conscious of this fact and this negatively
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But Surrealism itself would not see its first film with popular recognition until later in the decade with Un Chien Andalou (1929). It seems out of the ordinary that an emerging movement and a budding medium would have a such a gap in time before finding themselves commingled. And this consideration led to the question of whether or
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Unified School District for 18 years as an instructional assistant. Especially‚ I stop believing in Blue Shield Health Insurance for the following reasons: 1) Mr. Chien Ngo ineffectively handled my case of health insurance; 2) Blue Shield mailed the bill too late. First‚ necessity underlies the decision to buy a health care plan‚ but Mr. Chien involved himself in doing several false things. When I asked that if he could help me on my family’s fertility‚ that my family wanted to have the children‚ he
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total charge must be equal on each side of the equation. Equations 1) Cu + 4H+(aq) + 2NO3-(aq) Cu2+(aq) + 2NO2 + 2H2O 2) Cu2+(aq) + 2-OH(aq) Cu(OH)2 3) Cu(OH)2 + heat CuO + H2O (Balanced) 4) CuO + H2SO4 Cu2+(aq) + SO42-(aq) + H2O (Balanced) 5) Cu2+(aq) + Zn + Cu + Zn2+(aq) (Balanced) Stage 1 Dissolution of Copper Mass of vial & copper = 3.598g
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Chlorine = +121 kJ/mol 1st ionisation energy of calcium = +590 kJ/mol 2nd ionisation energy of calcium = +1100 kJ/mol Electron Affinity of chlorine = -364 kJ/mol 2. Draw Born-Haber cycles and calculate the L.E. of Cu2O and CuO given: ∆Hf (Cu2O) = -166.7 kJ/mol ∆Hf(CuO) = -155.2 kJ/mol 1st I.E. (Cu) = +750 kJ/mol 2nd I.E. (Cu) = +2000 kJ/mol ∆Hat (Cu) = +339.2 kJ/mol 1st E.A. (O) = -141.4 kJ/mol 2nd E.A. (O) = +790.8 kJ/mol 3. 100 cm3 of 0.5 mol/dm3 ethanoic acid were mixed with 100cm3
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2.3 Magnesia-Doloma Refractories: The MgO-CaO system is remarkable for the high liquidus and solidus temperatures over the complete range 100% MgO- 100% CaO‚ as the eutectic for the CaO–MgO binary system occurs at 2370 ºC [3‚ 52]. MgO–CaO bricks are high-value refractories composed of lime (CaO) and periclase (MgO). MgO –CaO refractories has some advantageous and disadvantageous compared to MgO and CaO refractories (Table 1). Table 1 Typically‚ these refractories are composed by 50-80 wt. % of
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(aq) copper nitrate | dissolves into liquid state | Added sodium hydroxide | NaOH (aq) | small blue-ish chunks form | CuOH (s)copper hydroxide | clumps into blue-ish chunks | Added heat (removes H2O) | none | solution becomes muddy black-ish | CuO (s)copper oxide | heated into small‚ black‚ metallic almost shards | Added sulfuric acid | H2SO4 (aq) | turns shards and liquid blue-ish color | CuSO4 (aq)copper sulfate | joins the sulfate after filtering | Added zinc | Zn (s) | small‚ orange‚
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heated‚ the solution turned from a bright blur precipitate turned into a black color and black precipitates were formed this is the reaction Cu(OH)2(s)---> CuO(s) + H2O(l) The fourth reaction‚ when copper (II) oxide was dissolved into 6M sulfuric acid the solution turnes into a blue-green color‚ in the end it turned into blue. The reaction is CuO(s) + 2H+(aq)---> Cu2+(aq) + H2O(l) When Zn metal is added to copper (II) sulfate it released a foul smelling gas which was hydrogen‚ ‚ the Zn corroded into
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