of soapy water will be less than that of freshwater because H 2 0 has strong polar bonds‚ and when water is mixed with soap the polar bonds which help to bind the water together are weakened‚ thus lessening the surfacetension. Materials: pipette‚ liquid soap‚ water‚ beakers‚ penny‚ graduated cylinder‚ paper towels. Procedure: 1. I received a beaker filled with tap water. 2. I took a pipette and filled it upwith water from the beaker. 3. I began to add drops of water to a penny‚ which was headsup
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Experiment 2&3 Recrystallization and Melting Points Determinantion of Benzoic Acid Abstract In experiment 2‚ recrystallization was used to purify the crude benzoic acid extracted from a mixture during experiment 1. Then a percent recovery for this recrystallization process was calculated. In experiment 3‚ the melting point ranges of the crude and purified benzoic acid were both determined by using Melt Temp Apparatus. Introduction Recrystallization is a purification technique for non-volatile
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(g/mL) for liquid samples of matter. For that reason if the volume is known of a liquid‚ determining its density is easily determined by weighing it accurately. Density can also be used as a tool for finding the concentration of solutions in some cases. The density is different in a substance when a substance is added to a pure liquid to when both the solute and solvent were separate all together. There are many ways to determine density. This method determined the density of a liquid by weighing
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2-methylaniline > 2-chloroaniline From Table 3‚ the negative κsE values suggest that the structure-forming tendency dominant over to the structure-breaking tendency due to the hetero molecular interaction between the component molecules of the binary liquid mixtures. The magnitude of sE shows the following the sequence: 2-methoxyaniline > 2-methylaniline >
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trans-2-butene‚ and 28.1% cis-2-butene‚ and a dehydrohalogenation of 2-bromobutane yielded 19.1% 1-butene‚ 69.9% trans-2-butene‚ and 11.0% cis-2-butene. Backround: Gas Chromatography separates organic samples much in the same way as column chromatography. The only differences are that it uses a moving gas phase and a stationary liquid phase‚ and that the temperature of the gas system can be controlled. In a gas chromatograph the sample is shot in with a syringe and is immediately vaporized in a heated
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the thrust exerted on the large plunger? (400 N) c) How much work is done by the operator‚ if the smaller plunger moves down 0.1 m? (2J) 4. In a given U-tube open at left end and closed at right end‚ if the pressure above the liquid in the right arm is p‚ find the value of p. Given d2 = 2 x 13.6 g/cm3 d1 = 13.6 g/cm3. Atmospheric pressure pa = 76 cm of Hg. 5. What will be the length of mercury column in a barometer tube when the atmospheric pressure is 75 cm of mercury and
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relation between precipitation state % precipitating conditions 3. To learn the way to examine whether reactants are fully precipitated 4. To learn the principals of powder material synthesizing through room temperature solid phase method & liquid phase method directional growing crystal form of precipitation Experiment Principals 1.the process of precipitation forming constitutive crystal ion accumulating growing forming nuclei sediment particals amorphous precipitation crystal nuclei
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temperature of the Paradichlorobenzene every 30 seconds and of the water every 30 seconds. 15. When the temperature of the Paradichlorobenzene is within 3-5 degrees of the temperature of water‚ stop recording and remove the thermometer from the liquid‚ then remove the test tube from the water bath. 16. Clean up as
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Singapore Polytechnic School of Chemical and Life Sciences Basic Mathematics [MS2125] Active Learning Assignment Part I Submitted by: Yap Xin Yi (1416237) Yjasmin Yvette Morales Naquila (1452129) DCHE/FT/1A/06 Date of submission: 18 July 2014 Q1. Fill in the table below: (The table below is to help you in your brain-storming; you do not need to be specific or accurate at this stage‚ but try to think divergently.) (5 marks) What do we know about this problem? (i.e. what information is
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Dylan Wang—8Br Ms. Cooney Chemistry 8 February 25‚ 2015 Chemistry Questions 1. Explain what is happening to the water molecules in the flat areas of the line on your graph during the phase changes from solid to liquid and liquid to gas. The water molecules are currently gathering potential energy to change from the differing states of matter. Due to thermal equilibrium‚ the water would need a set amount of energy to break through the changes in matter. This is why temperature slows down in these phase changes
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