a) Conical flask (preferably 250 ml) b) Funnel c) Glass rod d) Beaker (preferably 250 ml) e) Water bath f) Filter paper (Whatman paper or ordinary filter paper sheets. Preferably‚ Whatman) Chemicals Required a) CuSO4 b) NaOH solution c) Liquor ammonia solution d) Dilute H2SO4 e) Whatman Paper f) Distilled H2O Background Rayon is a synthetic fiber produced from cellulose. Developed in an attempt to produce silk chemically‚ it was originally
Premium Cellulose Sodium hydroxide Paper
(III) ion‚ in acid medium. c) the reduction of manganese dioxide‚ in acid solution‚ to give manganese (II) ion. 6. When copper metal is placed in concentrated nitric acid‚ the solution turns green and brown coloured NO2 gas evolved. Cu(s) + 4HNO3(aq) Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l) a) Which element is reduced? b) Which element is oxidised? c) Which is the oxidising agent? d) Which is the reducing agent? 7. When metallic zinc is added to an aqueous solution of silver nitrate‚ zinc dissolves
Premium Electrochemistry
ions from aqueous solutions. The biosorption studies were conducted in batch adsorption system as a function of contact time and initial metal ion concentration. The adsorption system attained equilibrium after 150 min of contact time for Pb (II)‚ Cu (II)‚ Zn (II) and Cd (II). The removal efficiency of red alga improved as metal ions concentrations were lowered. The equilibrium sorption data was better explained by Langmuir isotherm model suggesting that the adsorption of metal cations observed monolayer
Premium Adsorption
HKDSE CHEMISTRY – A Modern View (Chemistry) Coursebook 3 Suggested answers Chapter 25 Simple molecular substances with non-octet structures and shapes of simple molecules Page Number Class Practice 1 Chapter Exercise 2 Chapter 26 Bond polarity Class Practice 4 Chapter Exercise 5 Chapter 27 Intermolecular forces Class Practice 7 Chapter Exercise 9 Chapter 28 Structures and properties of molecular crystals Class Practice 11 Chapter Exercise 12 Part Exercise 14 Chapter 29 Chemical cells in daily life
Premium Hydrogen Battery Electrochemistry
98.) Consider the unbalanced redox reaction: Cr2O72- (aq ) + Cu(s ) → Cr3+ (aq ) + Cu2+ Balance the equation in acidic solution and determine how much of a 0.850 M K2Cr2O7 solution is required to completely dissolve 5.25 g of Cu. Nitric acid is usually purchased in concentrated form with a 70.3% HNO3 concentration by mass and a density of 1.41 g/mL. How much of the concentrated stock solution in milliliters should you use to make 2.5 L of 0.500 M HNO3? Mass %= Mass Solute/ Mass Solvent + Mass
Premium Chemistry Solubility Hydrogen
33 | 18.31 | 5.62 | 42.48 | Background concentration(Mertin and Meybeck‚ 1979) | 20.00 | 0.20 | 97.00 | 32.00 | 129.00 | Table 4.3: TCLP test result (mg/L) for the sediment sample of the Turag River (Method USEPA 1311) Location | Pb | Cd | Cr | Cu | Zn |
Premium Water Water pollution
– Chemistry: The Study of Change 1. Element‚ compound‚ homogeneous mixture (solution)‚ or heterogeneous mixture: a) orange juice b) brass c) 0.9% saline (NaCl) solution d) garden soil e) room air f) methane gas g) sodium metal h) N2 gas i) Cu(NO3)2 crystals (freshly-squeezed) 2. Define (some of these terms are found in Chapters 2 and 3): a) c) e) g) i) k) m) o) 3. b) d) f) h) j) l) n) compound physical change law of conservation of mass extensive properties accuracy stoichiometry Avogadro’s
Premium Sulfuric acid Oxygen Carbon dioxide
Abstract: One is to determine the gap energy of cadmium sulfide semiconductor thin film using the equation: Eg = h.c/ is the signal of the long wavelength limit of the absorption peaks (measured in the lab). The reaction between cadmium sulfide and NH3‚ in the presents of thiourea yield a of 579(nm). The % error of the reaction is 1.24%. Introduction: There are 3 types of metals for electricity conducting: metallic conductor‚ semiconductor‚ and superconductor. Metallic conductors
Premium Semiconductor Photon Atom
Copper (II) Sulfate Drops (column2) Sodium Carbonate Drops (Column 3) General Observations- ColourPrecipitate (column4) 119Light BlueLittle 237Medium BlueMedium 355Dark BlueLarge 473Medium BlueMedium 591Light BlueLittle Double Displacement: CuSO4 (aq) + NaCO3 (aq) à
Premium Chemistry Ratio Chemical reaction
odor No effect No effect No effect Red litmus paper turn blue White bubbles No effect Cu Brown No odor No effect No effect No effect Red litmus paper turn blue No effect No effect Zn Silver No odor No effect No effect No effect Red litmus paper turn blue Fizzing No effect MgO White Powder smell No effect No effect Strong boil Red litmus paper turn blue Yellow fizz No effect Cu(NO3)2 Blue No odor Turn green No effect No effect No effect Turn green No effect
Premium Sodium Color Green