and Bolts Table 4.2. Mass of nuts and bolts Mass of nuts (g) 4.126 Mass of bolts (g) 24.176 Mass of nut-and-bolt pairs 14.000 Table 4.3. Summary of results on nuts and bolts. B. THE TARGET: Reaction of Sodium Carbonate and Calcium Chloride. Table 4.4. Observations from the reaction between Na2CO3 and CaCL2. Sample Observations Na2CO3 solution COLORLESS CaCL2 solution COLORLESS Na2CO3 + few drops of CaCL2 Produced a cloudy‚ white mixture After Filtration Precipitate WHITE
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Chemical Reaction of copper compounds Introduction: In this experiment‚ the objective was to conduct a series of chemical reactions that contain copper or copper compounds. That is to say that the products of each chemical reaction were used in the next reaction. The process starts with a solid copper wire dissolved in nitric acid and the end product is copper powder. The product which was used from the previous reaction is the limiting. In the initial step‚ the solid copper is the limiting reactant
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ST ANDREW’S JUNIOR COLLEGE JC 2 Preliminary Examination CHEMISTRY 9647/03 Higher 2 13 September 2010 Paper 3 Free Response 2 hours Candidates answer on separate paper. Additional Materials: Answer paper‚ Graph Paper‚ Data Booklet READ THESE INSTRUCTIONS FIRST Write your name and civics group on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use a soft pencil for any diagrams‚ graphs or rough working. Do not use staples‚
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determine the characteristic colors produced by certain metallic ions when vaporized in a flame and identify unknown metallic ions by means of their flame tests. Materials •Barium Chloride •Calcium Chloride •Cupric Chloride •Lithium Chloride •Potassium Chloride •Sodium Chloride •Strontium Chloride •Bunsen burner •Flint striker •Wooden splints •Goggles Procedure 1. Prepare the Bunsen burner as discussed in class. 2.
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Extracting NaCl from Rock Salt and assessing its purity Aim The aim of this experiment was to obtain a pure product from a solution through the processes o extraction‚ filtering and evaporation. Introduction Extraction is used when trying to separate or purify a product. For an extraction to be successful the substance used to make the solvent should readily dissolve. The substance used in this practical was rock salt. The liquid used should not react with the substance that needs extracting
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time to escape and would have been incorrectly measured. 4. Write a word equation for the chemical reactions that took place. Hydrochloric Acid (Hydrogen Chloride) + Magnesium = Magnesium Chloride + Hydrogen Hydrochloric Acid (Hydrogen Chloride) + Zinc Chloride + Hydrogen Hydrochloric Acid (Hydrogen Chloride) + Iron = Iron Chloride + Hydrogen Sulphuric Acid (Hydrogen Sulphate) + Magnesium = Magnesium Sulphate + Hydrogen Sulphuric Acid (Hydrogen Sulphate) + Zinc = Zinc Sulphate + Hydrogen
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pipets (2) | |conductivity tester |CaCl2 (calcium chloride) | |ethanol |KI (potassium iodide) | |iron ring |NaCl (sodium chloride) | |ring stand |C13H18O2 (ibuprofen)
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dialysate. Hypothesis: The sodium chloride will definitely pass through the semi permeable membrane because it is a very small molecule‚ compared to the large pores in dialysis tubing. Glucose and starch have bigger molecules‚ and therefore are less likely to pass through the dialysis tubing Materials: • 250- mL beaker • 12 test tubes (varied sizes) • 200mm dialysis tubing • String • 1.0% starch solution • 10% glucose solution • 5% sodium chloride solution • Benedict’s reagent • Iodine
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to the mass of one product. Purpose: The experiment will be designed to find out the stoichiometric mole ratio of Barium Chloride and Silver Nitrate yielding a precipitate of Silver Chloride in a Barium Nitrate solution. (BaCl2 + 2AgNO3 -> Ba(NO3)2 + 2AgCl) Research Question: How will the amount of Barium Chloride and Silver Nitrate affect how much Silver Chloride is produced? Hypothesis: If there is one mole of BaCl2 in the reaction‚ then two moles of AgCl will be produced. Variables:
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Add sulfuric acid to the mixture of benzoic and methanol‚ heat up the mixture to 65 oC. Transfer the mixture to the separatory funnel and add ether‚ sodium bicarbonate and saturated sodium chloride-brine solution‚ drain the bottom layer each time and remain ether layer. Decant the solution with calcium chloride‚then evaporate the ether by steam bath and cool down. The product is methyl benzoate. Pour methyl benzoate into cool concentrated sulfuric acid and keep the temperature below 10oC. Add concentrated
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