What is observed? A B C D 2 a colourless layer below a purple layer a colourless liquid with the purple crystal unchanged a purple layer below a colourless layer a uniformly purple solution A student adds aqueous sodium hydroxide or aqueous ammonia to aqueous solutions of four different metal compounds. Which solution contains Zn2+ ions? add a few drops of NaOH(aq) ppt ppt ppt no ppt add excess NaOH(aq) ppt dissolves ppt dissolves ppt no ppt add a few drops of NH3(aq) ppt ppt no ppt no ppt add
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identification. Materials: 1 Household Bleach‚ 2 mL 1 Distilled water 1 Toothpicks 2 Beaker‚ 50 mL‚ plastic 1 Cylinder-25-mL 1 Pencil‚ marking 1 Test Tube (5)‚ 13 x 100 mm in Bubble Bag 1 Well-Plate-24 1 Ammonium Molybdate‚ 0.2 M - 2 mL in Pipet 1 Aqueous Ammonia‚ 6 M‚ NH4OH - 4 mL in Pipet 1 Barium Chloride‚ 0.3 M - 2 mL in Pipet 1 Hydrochloric Acid‚ 6 M - 8 mL in Dropper Bottle 1 Nitric Acid‚ 6 M - 2.5 mL in Pipet 1 Organic Reagent - 1.5 mL in Vial 2 Pipet‚ Empty Short Stem 1 Silver Nitrate‚ 0.1 N -
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for each wrong answer. Ball point pen can be used for darkening but once darkened cannot be erased) (Uploading of correct answer in the internet: 07.02.2011) CHEMISTRY SECTION 1. Which of the following compound on boiling with water produces ammonia gas (a) Mg3N2 (b) NH4Cl (c) NaNO2 (d) only (a) and (b) 2. Which of the following is not a redox reaction (equations are not balanced) (a) Sn + NaOH → Na2SnO3 + H2 (b) NH4NO3 → N2O + H2O (c) PbO + KOH → K2PbO2 + H2O (d) Ca(OCl)Cl + NH3→ CaCl2 +
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tendency to be infected with e-coli‚ salmonella and other bacteria. Eldon Roth created a process by which the beef trimmings are put in a 100 degree heated centrifuge which mechanically removes the fat from the meat. The meat is then treated with ammonia gas (or citric acid which is now used by BPI competitors) to kill the e-coli‚ salmonella and other bacteria and then sold to ground beef producers who use up to 25% of it as an additive in their ground beef. It is estimated that 70% of ground beef
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sample was precipitated as magnesium ammonium phosphate hexahydrate. It follows the equation‚ 5H2O(l) + HPO42-(aq) + NH4+(aq) + Mg2+(aq) + OH-(aq)→ MgNH4PO4∙ 6H2O(s) (1) The precipitating reagent used is ammonia‚ NH3. Ammonia is used instead of ammonium chloride because the latter produces Cl- ions that may react with the Mg2+ ions found in the solution‚ thus‚ forming MgCl2(s). This can interfere to the production of the desired precipitate. Forming the precipitate
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“Ammonia Treatment in Textile Processing” Before Studding “Ammonia Treatment” we have to know about the Pretreatments in textile processing…. Why we do Pre-Treatments? Pretreatment is the heart of processing of textile. Grey cloth after weaving is quite unattractive and contains numerous natural as well as added impurities which hinder the successful carrying out of subsequent step like dyeing‚ printing and finishing. What are Pre-Treatments? In Pretreatment‚ all
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magnesium by hydrogen displacement method. (equivalent weight of magnesium=12) Set 2 11. To prepare hydrogen gas in lab and collect it to 12. To prepare carbon dioxide gas in lab and collect it to study its properties. 13. To prepare ammonia gas in lab and collect it to study its properties. Set 3 14. To detect the acid radical (negative charge) present in the given salt sample by dry and wet way. 15. A1 16. A2 17. A3 18. A4 19. A5 20. A6 21. A7 Set 4
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the reaction in each of the reagents • The overall order of the reaction 2) The rate constant for the reaction HNO3 + NH3 ( NH4NO3 is 14.5 L / mol.sec. If the concentration of nitric acid is 0.050 M and the concentration of ammonia is 0.10 M‚ what will the rate of this reaction be? 3) When two compounds‚ A and B‚ are mixed together‚ they form compound C‚ by a reaction that’s not well understood. Fortunately‚ the following rate information was experimentally
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4.1 & 4.2: General properties of aqueous solutions and Precipitation Reactions: 1. (Brown 4.11) When asked what causes electrolyte solutions to conduct electricity‚ a student responds that it is due to the movement of electrons through the solution. Is the student correct? If not‚ what is the correct response? 2. (Brown 4.15) Specify what ions are present in solution upon dissolving each of the following in water: a. ZnCl2 c. (NH4)2SO4 b. HNO3 d. Ca(OH)2 3. (Brown 4.16 ) Specify
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Name: Joie Vincent R. Dagohoy Date performed: 07-01-13 Student Number: 2009-33281 Date submitted: 07-08-13 Exercise 2 Formulation‚ Testing of Hypothesis‚ and Experimental Design I. Objectives: a. to define diffusion and demonstrate this process in gases b. to cite molecular weight and time as two factors affecting the rate of diffusion c. to formulate a hypothesis on the relationship of each of these factors on the rate of diffusion d. to conduct and experiment
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