Experiment No ____ 2.0 hours D1=2‚D2=1‚D3=0 The Effect of Temperature on the Solubility of Carbon Dioxide in Water under Constant Pressure Beijing World Youth Academy Subject: Chemistry Student name: YeiYoung Choo Candidate number: 000791 011 January 21‚ 2009 Teacher Helen Xu The Effect of Temperature on the Solubility of Carbon Dioxide in Water under Constant Pressure (Evaluated for Design) Research Question What is the effect of temperature on
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Controlled (Constant) 1) Mass of CaCO3 2) Temperature of reaction 3) Concentration of HCl 4) Volume of HCl 5) Time intervals for recording volume Apparatus: 100 mL Conical flask Single-holed rubber stopper 90 g of CaCO3 chips 90 g of CaCO3 powder 90 g of CaCO3 tablets 100 mL gas syringe 100 mL graduated cylinder Digital Stopwatch 450 ml 1.0 M HCl Stand & Clamp Electronic balance Safety Procedures: 1) Wear safety goggles for protection. 2) Handle
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“A Separate Peace” Throughout the novel‚ many settings reveal characters and events that had great importance in the book. The tree‚ the Assembly Room and the White Marble Staircase revealed Finny’s accident‚ and how the characters reacted. At the tree‚ Phineas is shaken from the tree and into the Devon River. Finny breaks his leg‚ creating the climax of the novel and a while after‚ Brinker hosts a trial to discover the truth about what really happened at the tree in the Assembly Room. During the
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The speed of chemical reactions – class experiment By Julia Shuker Year 10 science – Miss Phillips – Term 2 – 2013 – Julia Shuker Aim The aim of the experiment was to investigate the factors that increased or decreased the speed of chemical reactions between two different chemical reactions. Hypothesis If certain factors‚ such as concentration‚ temperature‚ catalyst and surface area are increased then the reaction rate will also increase due to the particles
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carried out under the supervision of a teacher Safety goggles must be worn when working with acids. Factors Affecting Reaction Rate EQUIPMENT AND MATERIALS Part 1. Effect of Particle Size solid zinc‚ approx. 0.5 cm × 2 cm‚ or solid marble chips zinc powder or calcium carbonate powder balance 2 test tubes 1M HCl (approx 10 mL per group) Part 2. Effect of Temperature 3 Alka Seltzer tablets 3 250-mL beakers water at three temperatures – with ice‚ room temperature‚ warm (around 70°C)
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Aspects lab were that starch‚ potato juice‚ cracker solution‚ and cereal contain starch. In the reducing sugar test glucose‚ fructose‚ lactose‚ and milk contain a reducing sugar. In the grease spot test‚ salad oil‚ milk‚ and chips are lipids. In the dye test‚ salad oil and chips are fats. Egg albumin‚ cereal‚ and cracker mixture show that they are proteins. In the Spit lab the saliva and cracker test showed up positive. The starch test for saltine was positive. The reducing sugar test for saltine was
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the balloon changes when it is left in a sunny place. [1] © UCLES 2011 1113/01/SP/12 [Turn over 4 3 Maya investigates the reaction between calcium carbonate and hydrochloric acid. She adds dilute hydrochloric acid to some calcium carbonate (marble chips)‚ at room temperature. She collects the gas given off in a gas syringe. For Examiner’s Use dilute hydrochloric acid syringe calcium carbonate (a) Suggest one safety hazard in this experiment. How can Maya reduce the risk from this hazard? hazard
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x Conical Flask with side arm 1 x Clamp and Boss 1 x Rubber stopper 1 x Scale 1 x 30 cm‚ thin tube 1 x Stand 1 x Stop watch 1 x Measuring Cylinder (1‚000ml‚ 25 ml) 1 x Large‚ flat beaker 25 ml hydrochloric acid CaCO3 (chips‚ granules‚ powder) 1 x Stop watch 1 x Safety glasses/ lab coat per person Method 1. Setup like the diagram. Wear a lab coat and safety glasses. 2. Measure out 8ml of HCl‚ using a measuring cylinder‚ and pour it into the cynical flask
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the soil‚ lime is added. Agricultural lime or garden lime is made from pulverized limestone or chalk. Some types of garden lime are dolomite lime‚ quicklime and slaked lime. Calcium carbonate occurs in nature as limestone in various forms‚ such as marble‚ chalk and coral. It is produced either as powdered or precipitated calcium carbonate. Calcium carbonate decomposes to calcium oxide and CO2 on heating. Treatment with dilute mineral acids produces corresponding calcium salts with liberation of CO2:
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Discussion and Conclusion: Preparation of 1-Bromobutane The purpose of this experiment was to demonstrate the conversion of a primary alcohol‚ 1-butanol‚ to a primary bromoalkane‚ 1-bromobutane‚ a SN2 reaction. The conversion of 1-butanol to 1-bromobutane relies on sulfuric acid which plays two important roles. First‚ it protonates the alcohol of 1-butanol to form an oxonium ion which is a good leaving group. Secondly‚ it produces the hydrobromic acid‚ the nucleophile‚ which attacks 1-butanol
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