determine the percentage recovery and melting point of benzoic acid and p-diclorobenzene. Apparatus:Separatory funnel(250mL)‚Buchner funnel‚beaker. Materials:Benzoic acid‚p-dichlorobenzene‚ether‚10% NaOH‚conc.HCl‚distilled water‚ anhydrous CaCl2. Introduction: Organic compounds in an aqueous mixture can be separated by shaking the aqueous solution with a solvent which is immiscible with water. Extraction involves dissolving either a compound or compounds from solid into a solvent or from solution
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Another friend of Libra Dexter Patrick S. Baltazar Pre-test: Chemical balancing Instruction: Balance each chemical equation by adding a correct coefficient to it. Question 1 __ SnO2 + __ H2 → __ Sn + __ H2O Question 2 __ KOH + __ H3PO4 → __ K3PO4 + __ H2O Question 3 __ KNO3 + __ H2CO3 → __ K2CO3 + __ HNO3 Question 4 __ Na3PO4 + __ HCl → __ NaCl + __ H3PO4 Question 5 __ TiCl4 + __ H2O → __ TiO2 + __ HCl Question 6 __ C2H6O + __ O2 → __ CO2 + __ H2O Question 7 __ Fe + __ HC2H3O2 → __ Fe(C2H3O2)3 +
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varieties (used for bananacue); have Vitamins A‚ B and C • Saba banana (Musa acuminate x Musa balbisiana) : a triploid hybrid (ABB) banana cultivar originating from the Philippines • Soda Ash: a common name for the compound sodium carbonate (Na2CO3).
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eggshells‚ the following experiment has to be done to determine the percentage of calcium carbonate in eggshells. In this experiment‚ back titration is used. First‚ excess acid is reacted with the calcium carbonate in eggshells: 2HCl(aq) + CaCO3(s) → CaCl2(aq) + H2O(l)+ CO2(g) Later‚ if we can find out the number of mole of unreacted acid‚ number of mole of calcium carbonate can then be found out. The number of mole of unreacted acid can be found by titration with the following reaction: HCl(aq) +
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Introduction: Bacteria are microscopic‚ single-celled organisms. Their genetic information is encoded in one large chromosome. It can also be found in plasmids which are small circular pieces of DNA that contain important genetic information for the growth of bacteria. In nature‚ this information is often a gene that encodes a protein that will make the bacteria resistant to an antibiotic. The reason for this protein being made within the bacteria is because of how bacteria usually grow in the same
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Solution Review Complete all questions in this package. Be careful to use correct significant figures and units for any calculation problems. For all chemical equations use phase subscripts. Concentration 1. Calculate the concentration of the solution formed when 23.61 g of sodium phosphate is dissolved in 475.0 cm3 of water. 2. What volume of water is needed to dissolve 85.8 g of silver nitrate to make a 2.650 M solution? 3. What mass of magnesium sulphate is needed to make 1500
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West Indies Alumina Company (WINDALCO)‚ formerly Jamalcan‚ is a joint venture between the UC Rusal and the Government of Jamaica. UC Rusal is the majority shareholder (93% stake) and manages the joint venture. The Government of Jamaica owns the remaining 7% share. Windalco comprises two alumina plants – Ewarton Works in St. Catherine and Kirkvine Works in Manchester. Alumina is a fine white material similar in appearance to salt. The Bayer process dissolves the aluminum component of bauxite
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Double-Replacement Double-replacement reactions involve two compounds exchanging elements: AB + CD ---> AD + CB Double-replacement reactions commonly occur when one of the products is not soluble and precipitates out of the reaction solution as a solid: CaCl2(aq) + Na2CO3(aq) ---> CaCO3(s) + 2 NaCl(aq) Combustion Combustion reactions occur when substances‚ particularly those containing carbon‚ burn in the presence of oxygen to produce carbon dioxide and water: CxHy + O2 ---> CO2(g) + H2O(g) Methane‚ for example
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Permanent Water Hardness of Water Sources from PSHS-IRC by Indirect Titration Researchers Anna Marie S. Cabatbat Crystal Jill R. Mangsat Jan Michael Maturan Charlene Lou A. Nicer Arian Paul D. Norcio Submitted to the Faculty of the Philippine Science High School – Ilocos Region Campus in partial fulfillment of the requirements for Science and Technology Research 2 March 2013 ABSTRACT This study aimed to determine the permanent water hardness in terms of calcium carbonate
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Heat of Reaction and Hess’s Law Introduction: Hess’s Law is a very useful relationship that allows the calculation of the heat of reaction for reactions on paper (without carrying out an actual experiment of that particular reaction). You must first know the heats of reaction for related reactions that add algebraically to give the desired reaction. If it can be shown that reaction 1 + reaction 2 = reaction 3‚ then Hess’s Law states that H1 + H2 =H3. Thus‚ if you know the heats of reaction
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