still set to high collect the third sample until the boiling flask is almost dry. 9. Remove the heat source and drain the distilling column. 10. Measure the volume of each fraction received and record the results. 11. Determine the percent pure for each component of the mixture. 12. Pour some of each fraction into three separate vials‚ label and store. 13. Disassemble and clean the fractional distilling apparatus using hexane for the joints and acetone for the glassware.
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ethanol and 1-butanol. in theory the fractional distillation should be more efficient because of the steel sponge. The sponge acted as surface area for gas to condense on. This prevented some of the 1-butanol from condensing into the vial during fraction A because it would condense onto the sponge and drip back down into the flask. The boiling point of 1-butanol is higher than the boiling point of ethanol‚ so the cooler surface of the sponge helped condense 1-butanol‚ but the ethanol still made it
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Did the experiment showed expected results (when the experiment was not to answer the question)? For example‚ was the protein sample fractionated as expected and was the number of fractions you collected close to what you expected? If not‚ what could be the cause of the unexpected results? Describe the sources‚ or suspected sources of error. Describe all the problems in the procedure (how and why it did not work). What should you do
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NanoCrystals offered by NanoSystems‚ a division of Elan Pharmaceutical Technologies [7–9]. An extra effect can be acquired by a controlled structural change in drug nanoparticles‚ which means decreasing the crystallinity and increasing the amorphous fraction. Examples of drug nonoparticles with structural changes are the products NanoMorph marketed by Knoll/BASF Pharma (company brochure) and the drug nanosuspensions marketed under the name DissoCubes [10‚11]. DissoCubes bring together the benefits of
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with the “banking” concept can relate to an issue I had in my geometry class‚ health class‚ and in english class in high school. In geometry class my teacher gave me math problems on fractions. I didn’t know how to solve fractions. I only knew how to solve fractions in my own way. I showed my teacher how I solved fractions‚ but he did not wan t it that way. He wanted me to do the problems his way that he knew. Freire said‚ “The teacher talks and the student listen-meekly.” (friere2.) I was listening
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taken as risk free rate. c) Bond rate of division and Marriott As there are both floating and fixed rate bonds among divisions and Marriott‚ the bond rate can be calculated as Bond rate of Division or Company = Fraction of Debt at Floating *(Bench Mark Rate +Premium) + Fraction of Debt at Fixed * Fixed bond rate d) Weight of Debt and Equity Leverage level of 1988 is 60% of total capital debt‚ 40% of total capital equity‚ and leverage ratio (total capital / total equity) is 2.5 2. Key factors
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Intro: For ages people all over the world have grown up watching movies or TV shows on aliens‚ or crazy broadcast stories of mysterious seen footage of UFOs. Aliens go way back in time from ancient Greece and their disciples‚ maybe even further back according to ancient alien theorists. But is it true? These green colored creatures we’ve grown up seeing from Scary Movie‚ E.T. Extra-Terrestrial and even sweet Yoda from Star Wars all part of our figment of our imaginations or real but being hidden
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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS‚ VOL. 8‚ NO. 11‚ NOVEMBER 2009 5601 A Comprehensive Analysis of Low-Power Operation for Beacon-Enabled IEEE 802.15.4 Wireless Networks Yu-Kai Huang‚ Student Member‚ IEEE‚ Ai-Chun Pang‚ Senior Member‚ IEEE‚ and Hui-Nien Hung Abstract—ZigBee‚ a unique communication standard designed for low-rate wireless personal area networks‚ has extremely low complexity‚ cost‚ and power consumption for wireless connectivity of inexpensive‚ portable‚ and moving
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Finding the Ratio of Moles of Reactants in a Chemical Reaction Purpose: The goal of the lab is to determine the mole ratio of two reactants in a chemical reaction (AgNO3 and K2CrO4). However‚ the formulas for the products are unknown. Introduction: When determining the molar ratio of a chemical equation‚ usually the formulas of the reactants and the products are known. With that information‚ it is particularly easy to determine the ratio. However‚ since the products and the formulas for
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not when finished! You may split page with one side procedure and one side a table for volume collected and temperature recorded. Post-lab Reminders: Retention times (see chromatograms) Calculations for C‚ R‚ XPV (mole fraction of propanol vapor)‚ XBV (mole fraction of butanol vapor) – fill out the table Standard (l) Sample (v) AP AB AP/AB R C XP XB Include an example of each calculation Plot of boiling point versus volume (from recorded table in procedure) Calculate HETP
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