Sulphur dioxide in white wine Date: XX/XX/XXXX Objective To determine the total sulphur dioxide content in a brand of white wine. Theory Hydrogensulphite is often added to white wine for its preservation. Only a little amount of free SO2 exist in white wine. All the available SO2 (including those from hydrogensulphite) are first converted to SO32- as illustrated by the following equations. SO2(aq) + 2OH-(aq) SO32-(aq) + H2O(l) HSO3-(aq) + OH-(aq) SO32-(aq) + H2O(l) Addition of acid
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Topic 11a – Group 7‚ the Halogens Revision Notes 1) Trends in physical properties of the elements • At room temperature‚ Cl2 is a pale green gas‚ Br2 is a brown liquid‚ I2 is a blue-black solid. • In Group 7‚ boiling point increases down the group because the molecules have more electrons and‚ therefore‚ stronger van der Waal’s forces which require more energy to overcome them • Electronegativity is the ability of an atom to attract the electrons in a covalent bond • Down
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(± 0.002g) | 0.125 | Table 2 : Mass of Crucible and lid Mass of Crucible /g (± 0.001g) | 15.147 | Mass of Lid /g (± 0.001g) | 9.670 | Table 3 : Mass of Magnesium Oxide Mass of Magnesium Oxide and Crucible and Lid /g (± 0.001g) | 24.985 | Mass of Crucible and Lid /g (± 0.002g) | 24.817 | Mass of Magnesium Oxide /g (± 0.003g) | 0.168 | Mass of Oxygen reacted with Magnesium = 0.168 - 0.125 = 0.042g ± 0.005g Both the crucible and the lid are in good condition‚ with some stains.
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aircraft. Magnesium and Aluminium are two metals that are both renowned for being lightweight. Although they are not incredibility strong when they are in their pure state‚ they can be alloyed which provides the material with more strength. The material for the main skin of the aircraft needs to be as strong as possible whilst being as light as possible. Duralumin is an alloy that is used extensively for aircraft skin‚ it is a Aluminium - Copper based alloy‚ with 93.5% Aluminium and 4.4% Copper in
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9 References 10 Introduction Materials Materials Aluminium Alloy (Karim Habbas) The cylinder head of the K series has been casted from a cast alloy 319.0. The composition is as follows: Figure 1 Nikolay A. Belov‚ 2005. Multicomponent Phase Diagrams: Applications for Commercial Aluminium Alloys. Figure 1 Nikolay A. Belov‚ 2005. Multicomponent Phase Diagrams: Applications for Commercial Aluminium Alloys. The alloy is strengthened by the precipitation of hardening
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Purpose: To determine the percent magnesium by mass in magnesium oxide and to observe if the percentage composition is constant by comparing class results. Hypothesis/Prediction: The percent composition by mass of magnesium in magnesium oxide will not change significantly with each group that conducted the experiment. The composition of each substance should stay the same and any differences must be due to some error. Materials:Magnesium stripCrucibleCrucible coverClay triangleIron ringRetort standTongsBalanceBunsen
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10/19/2011 Akruti Patel Lab Report #4: Determination of a chemical formula: the empirical formula of Magnesium Oxide 1. Purpose: Determine the empirical formula of magnesium oxide from the percent composition (this can found using the Analytical Method and the Synthesis Method). 2. Introduction: In the late eighteenth century‚ combustion has been studied extensively. In fact‚ according to Steven and Susan Zumdahl‚ Antoine Lavoisier‚ a French Chemist‚ performed thousands of combustion experiments
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Massing Magnesium Lab Research Question/Aim To understand the change in mass after burning magnesium and to also determine the chemical formula of magnesium oxide Hypothesis Burning the magnesium will result in an increase in mass because the magnesium will react with oxygen in the air to make magnesium oxide Variables Independent- Initial mass of magnesium (Mg) Dependent- Mass of the burnt magnesium (MgO) Controlled: Intensity of flame Apparatus used (same crucible‚ Bunsen burner
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Lab Report Abstract: The purpose of this lab was to see how magnesium reacts with oxygen. This reaction must be forced with heat. As magnesium changes to magnesium oxide the mass increased. Procedure: 1. Set up the stand and bunsen burne. 2. Go to crucible heat oven to obtain a crucible. 3. Weigh the crucible and lids mass. 4. Break up the magnesium ribbon on the crucible and weigh the mass of the magnesium‚ crucible‚ and lid. 5. Place the crucible on the ring stand over the flame. Allow
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by SSRT with a proper selection of testing variables. The metallurgical aspect of SCC behaviour of Al 2024-T351 was also discussed based on the microstructural and fractographic examinations. 1. Introduction High-strength 2xxx and 7xxx series aluminium alloys are susceptible to stress corrosion cracking (SCC) which may cause a
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