together (Cerpovicz and Wojciechowski‚ 1998) would have less error than those liquids containing stronger intermolecular forces. For this experiment‚ two volatile liquids were used. The first was methanol and the second was an unknown liquid‚ which may have been methanol‚ ethanol‚ iso-propanol and hexane. Methanol is a clear‚ flammable and toxic liquid which is sometimes used as a vehicle fuel. Its accepted molecular weight value
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carbon dioxide and water. In this experiment you will determine the molar heat of combustion of methanol‚ ethanol‚ 1propanol‚ 1butanol; and 1pentanol. Experimental Procedure Equipment * Electronic Balance ±0.01g * Measuring Cylinders ±1 mL * Aluminium Can * Cotton Wool * Theromometer ±0.5C * Retort Stand and Clamp * Spirit Burner containing alcohol sample * Alcohols (methanol‚ ethanol‚ 1-propanol‚ 1-butanol‚ 1-pentanol) Safety The alcohols are highly flammable. Always
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Molar Heat of Combustion Aim: To find the molar heat of combustion for four different alkanols: 1. Methanol 2. Ethanol 3. 1-Propanol 4. 1-Butanol - And to compare the experimental value with the theoretical. Background: The Molar Heat of Combustion of a substance is the heat liberated when 1 mole of the substance undergoes complete combustion with oxygen at standard atmospheric pressure‚ with the final products being carbon dioxide gas and liquid water. (Ref. “Conquering Chemistry‚ Roland
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purify solids contaminated by relatively small amount of impurities by a technique called Recrystallization. Compounds that have different solubility at different temperature usually can be recrystallized. Formulas and Structures: Benzoic Acid Methanol Percent Recovery: Indicates how much of the active ingredient was able to recover after the purification method. Weight of benzoic acid obtained after recrystallization % Recovered =
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of three different alcohols. Methanol‚ Ethanol and Isopropilic acid. Procedure: 1. Fill the spirit micro burner with Ethanol and weight it 2. Pour 100 cm3 of water into the aluminum cup 3. Arrange the cup a short distance over the micro burner 4. Measure the temperature of water 5. When the temperature of the water has risen by 10°C‚ record the temperature. 6. Reweight the microburner. Record 7. Repeat steps 1 to 6 but now with Methanol 8. Repeat step 1 to 6
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In this investigation I will be burning alcohol ’s to heat up a can of water. I will be burning four alcohol ’s‚ methanol‚ ethanol‚ propanol and butanol. The aim is to find out how much energy is produced when burning these alcohols. Alcohol ’s react with oxygen in the air to form water and carbon dioxide. The reaction that is involved in burning alcohols is exothermic because heat is given out. From this reason the reactant energy is higher than that of the product. The energy is given out when
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advantages of TPA over DMT are as follows: * Weight of TPA required per ton of fibre is about 15% less than that of DMT. * Lower TPA: glycol ratios are possible as compared to DMT: glycol ratio. * Methanol as a by-product is not produced when TPA is used as in DMT use. Hence‚ no methanol recovery plant is needed. *
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In this experiment Methyl salicylates are prepared along with ethyl and 2-propyl salicylates in which the reaction proceeds with salicylic acid as the starting material along with the other reactants such as methanol‚ ethanol and 2-propanol. More specifically‚ sulfuric acid is employed as the suitable acid catalyst. FIGURE 2: Formation of methyl salicylate from salicylic acid. 2. CALCULATION:
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1. Sodium and potassium are the most frequently ecountered alkali metals‚ though rarely as the metal. Why these elements are rarely found as the metal? (Refer to the relative measurements tabulated in the form of electronegativities‚ ionization energies‚ or reduction potentials). These are due to the fact that their outer most orbital (ns1 valence electron configuration) has tendency to lose electron very easily and make stable configuration. The single valence electron is relatively far from the
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membranes. Extreme heat will be more damaging than extreme cold. The more concentrated the solvent‚ the more damage it will cause to the membranes‚ therefore the solvent of 50% Acetone‚ and the solvent of 50% Methanol will have higher readings of damage than the solvents of 25% Acetone‚ and 25% Methanol. Materials: (See attached lab) Procedure: (See attached lab) Observations: Temperature Lab | |Quantitative results |Qualitative results
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