Copper Cycle Summary During the copper cycle lab‚ my partners and I performed a series of reactions on copper powder and observed the changes it underwent. For the first step‚ we mixed nitric acid and copper powder‚ and noticed that a yellowish brown gas emerged‚ along with effervescence. The red solid disappeared and became a blue liquid. We know that we produced copper nitrate‚ nitrate gas‚ and water because the only two blue solutions in “A New Language” are copper sulfate and copper nitrate
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Java Language Programming Basic Programming Elements Tiberiu Leţia: Software Engineering –Java Programming Language – Programming Basic Elements 1 Content 1. Stand alone applications and mini-applications 2. Name and identifiers 3. Java program structure 4. Data types 5. Operators 6. Flow execution control Tiberiu Leţia: Software Engineering –Java Programming Language – Programming Basic Elements 2 1. Stand alone applications and mini-applications Mini- applications = applets
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and dark brown. Hair distributed in four ranges of melanin concentration (the numerical estimate of color) showed no signif icant differences for concentration of Zn and Cu but showed a significantly higher (P < 0.01) concentration for Zn:Cu in black hair than in the other color groups. Correla tion between mineral content (Zn and Cu) and melanin was low and nonsignificant except for Zn in hair color ranging from 0-100 melanin units (r = - 0.34‚ P < 0.05). Discussion of these findings is presented regarding
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propipettes used for corrosive or toxic materials EXPERIMENT ONE Need to Know Know the reaction equations‚ which reactions occur (ex. by heating‚ etc.) and physical descriptions/color of tings Ex. CuO (s) (black solid) + H2SO4 (aq) + H2O --> Cu(SO)4 (aq) (blue solution) + H2O Know how to calculate percent yield (i.e. CuSO4 was obtained from the reaction of CuO with sulfuric acid. If 2.5 g of CuSO4 was obtained from 5.0 g of CuO‚ what is the percent yield?) Purpose To observe the chemical
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Samsung 20.9 cu.ft. Side By Side Refrigerator RS554NRUASL(Silver 40.33 cu. ft. Dimensions (WxHxD): 912 x 1‚789 x 700mm Voltage: 220V Compressor: Digital inverter Energy-saving LED lighting Frost-free Tilt Can beverage bin Multi Flow Twin Cooling System 4 door pockets 2 drawers 5 shelves P６５‚900 Samsung 20.9 Cu. Ft Side by Side Refrigerator RS554NRUA1J 20.9 cu. ft. Digital Inverter Compressor Twin Cooling System Dynamic MUlti Airflow System Energy Saving LED Display Capacity: 543 Liters
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Avoid breathing poisonous gases. Avoid contact of skin with nitric acid. It burns skin and clothing.) One student will be asked to feel the side of the demonstration beaker and report to the group. The products formed are copper(II) nitrate solution‚ Cu(NO3)2(aq)‚ and nitrogen dioxide gas‚ NO2(g). A solution of copper(II) nitrate was prepared earlier. One of your thin-stem pipets contains this solution. Transfer all of the solution to your labeled test tube. Another thin stem pipet contains sodium
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well be rusting and dissolving around us. Metal/ Cation or Solution HCl H2O CuSO4 ZnSO4 MgSO4 SnCl2 Fe(NO3)3 Cu NR NR NR NR NR NR NR Mg R NR R R NR R R Sn R NR R NR NR NR NR Zn R NR R NR NR R R Fe R NR R NR NR R NR Steel (FeAl) R NR R NR NR R NR Table 1 : Predictions Metal/Cation Or Solution HCL Mg2+ H2O Cu2+ Zn2+ Fe2+ Sn2+ Cu Rusted‚ Less shiny No reaction No reaction bubbles bubbles tarnished No reaction Mg Bubbles‚ Hydrogen gas No reaction
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metal‚ Trial 3=12 scoops‚ Trial 4=15 scoops‚ Trial 5=18scoops) 9. Empty graduated cylinder and repeat steps 1-8 for Metal 3 Data Table: Data - Metal 1 (Cu) MASS (g) VOLUME (cm3) Density (g/cm3) Cu - Sample #1 18.47 2.2 8.40 Cu - Sample #2 49.75 5.7 8.70 Cu - Sample #3 99.87 11.8 8.46 Cu - Sample #4 117.16 13.9 8.43 Cu - Sample #5 130.64 15.2 8.59 Data - Metal 3 (Ni) MASS (g) VOLUME (cm3) Density (g/cm3) Ni - Sample #1 16.71 1.2 13.92 Ni - Sample #2 28.37
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Reactions | | | Overall Cell Reaction | Observed Voltage | Theoretical Voltage | Cu2+(aq)+Zn(s) Cu(s)+Zn2+(aq) | 0.947 V | 1.10 V | Cu2+(aq)+Sn(s)Cu(s)+Sn2+(aq) | 0.571 V | 0.473 V | Cu2+(aq)+Fe(s) Cu(s)+Fe2+(aq) | 0.512 V | 0.777 V | Cu2+(aq)+Mg(s) Cu(s)+Mg2+(aq) | 1.598 V | 2.707 V | Cu2+(aq)+Pb(s) Cu(s)+Pb2+(aq) | 0.651 V | 0.463 V | Concentration Cell | Based on Cu2+ - Cu | Cell Reaction | | [Cu2+] anode | [Cu2+] cathode | Observed Voltage | Theoretical Voltage | 1.0
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melting point of the compound was 218-2200C. Scheme: Synthesis of RAPPTH 2.2 Synthesis of Mn (II)‚ Co (II)‚ Ni (II) and Cu (II) metal complexes of p-Toluic hydrazone and Resacetophenone Schiff base (RAPPTH): The reagent p-Toluic hydrazone and Resacetophenone(2‚4dihydroxyacetophenone) Schiff base was dissolved in 40ml of 50% methanol and Mn (II)‚ Co (II)‚ Ni (II) and Cu (II) metal ions dissolved in 20ml of distilled water‚ this compounds mixture was stirred for 6 hours in the presence of
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