Design Objective: Find the standard molar enthalpy of combustion for magnesium. Manipulated Variables- volume of HCl‚ length of magnesium strip‚ mass of magnesium oxide‚ Controlled Variable- type of calorimeter (Styrofoam cup) Responding Variable- change in temperature Procedure: 1. Cut out 3 pieces of magnesium strips each with lengths of maximum 5 centimeters. 2. Measure and record the lengths of the magnesium. 3. Scrub the magnesium strips with steel wool to clean out impurities
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__________________________________ MATERIALS AND PROCEDURE As per Essential Experiments for Chemistry pages 163–170 RESULTS TABLE 1 Equilibrium involving bromocresol green Initial colour of bromocresol green in water = Reagent added HCl (step 3) more HCl (step 4) NaOH (step 5) more NaOH (step 6) Stress Colour change and # of drops required Direction of shift ver. 02/2012 1 Chemistry 12 Unit 2 Reaction Equilibrium TABLE 2 Equilibrium involving iron(III) thiocyanate ion Colour
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following factors must be satisfied in order for a duty of care in negligence to arise: 1) Test for factual foreseeability 2) Test for proximity 3) Test for policy Case 1: MMBooks v Hamza Construction Ltd (‘HCL’) Hamza Construction Ltd (‘HCL’) is doing some tunnel work for the MRT Circle line in the Bras Basah area. At about 11am one Friday morning‚ one of their workers excavated into some telephone and electricity cables. This affected a building down the road where a
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Milk of Magnesia is able to lower the acidity of the stomach by neutralizing some of the acid. It works as a laxative by drawing in water from the intestines. Common Name: Baking Soda Scientific Name: Sodium Bicarbonate Formula: NaHCO3 Fundamental particles: Baking Soda is comprised of one Sodium ion (Na+) and one Bicarbonate ion (HCO3-) Usage: Baking Soda has many uses; it can be used in cooking as well as cleaning‚ as an antacid and can also be used to fight odors. Properties:
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Vineet Nayar is the vice chairman and CEO of HCL Technologies. HCLT is an India based global information technology service company. HCLT is one of the Indian IT leaders‚ recognized globally for its business performance and innovative and management practices. Messaging refers to ways leaders can communicate while focusing the organization’s efforts on creativity and innovation that address change and the adaptive challenge. Internal messaging is information passed to employees‚ shareholders‚
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18.9 g 9. Percent acid or base in unknown 3.84 % 3.84 % 10. Manufacture’s claim 5.8 % 5.9 % 11. Percent deviation 23 % 23 % Table 3 Trial 1 Trial 2 1. Liters of Unknown‚ NaOH 0.020 L 0.020 L 2. Molarity of HCl 1.0 M 1.0 M 3. Liters of HCl used to titrate 0.0141 L 0.0154 L 4.
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Exercise 14: Qualitative Anion Tests PURPOSE: The purpose of this experiment is to identify some commonly occurring anions & to study some of the reactions used for their identification. PROCEDURE: You must first determine to which of the three groups the various anions belong. Since no two people observe the same event in exactly the same way it is important to also conduct specific confirmation tests on the known samples of each anion. This information will help identify the anion
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HCL Technologies Ltd BSE: 532281 | NSE: HCLTECH | ISIN: INE860A01027 Market Cap: [Rs.Cr.] 88‚121 | Face Value: [Rs.] 2 Industry: Computers - Software - Large Discuss this stock Company Profile HCL Technologies Ltd is a global technology company. The company is primarily engaged in providing a range of software services‚ business process outsourcing and infrastructure services. The company leverages an extensive offshore infrastructure and its global network of offices in various countries
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RETAINING TALENT HCL’s Entrepreneurship Shergill of HCL Technologies feels the company has built employee programmes and policies that reflect their ’employee first‚ customer second’ strategic model. Shergill says the company fosters a culture of idea-preneurship that enables employees to generate creative insights and helps retain top performers. Their HCL Value Portal provides a forum for HCL employees and customers where HCL employees identify problems in a product and provide solutions that
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Acid Base Titration Purpose: The purpose is to calculate the molarity of a NaOH solution by titrating the base with 5mL of standard HCl solution in each trial. By adding the base with unknown molarity to the acid with 0.10M the molarity of NaOH can be calculated. The base‚ NaOH‚ helps bring the pH of the acid‚ HCl‚ closer to seven‚ which neutralizes it. When using the buret the amount of NaOH used is able to be determined. Then by writing a balanced chemical equation and using the titration
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