Extraction (Ch # 07) Faraz Gohar Mr. Wayne Xie Chem 201 10/02/2012 Objectives : 1)To purify samples of organic compounds that are solids at room temperature. 2)To dissociate the impure sample in the minimum amount of an appropriate hot solvent Chemical Index : Naphthalene; mp 82 *C 1‚4-Dichlorobenzene; mp 56 *C 4-Chloroaniline; mp 68 - 71 *C; pKb 4.15 Ethyl 4-Aminobenzoate; mp 90 *C; pKb 4.92 Procedure :
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Should Netscape go public to satisfy its capital needs? Netscape does need to go public to satisfy its capital needs over the next three to five years. Netscape is in a position to capitalize on the consolidation of the technology sector. Further‚ they need to remain competitive against Micorsoft’s Internet Explorer. By taking the company public‚ Netscape will also be able to raise capital to expand its business‚ finance acquisitions‚ pay debt and have greater access to capital in the future
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question and answer book is provided with this data book. Students are NOT permitted to bring mobile phones and/or any other unauthorised electronic devices into the examination room. © VICTORIAN CURRICULUM AND ASSESSMENT AUTHORITY 2012 2012 CHEM DATA BOOK 2 Table of contents page 1. Periodic table of the elements 3 2. The electrochemical series 4 3. Physical constants 5 4. SI prefixes‚ their symbols and values 5 5. 1H 6.
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Worked solutions to student book questions Chapter 2 Analysis by mass Q1. a b Why was the soup sample in Worked Example 2.1 heated to 110°C? Why was it necessary to weigh the sample four times? A1. a b The soup was heated above 100°C to evaporate water from the sample. By repeatedly heating the sample until the mass remained unchanged‚ the analyst could be sure that all the water had been removed. Q2. Some laboratories use microwave ovens in place of conventional ovens to
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a substance that conducts an electric current when dissolved in water is called an electrolyte a non-electrolyte is a substance that does not conduct an electric current in aqueous solution NH4+‚ NO3-‚ and group 1A cations are ions that always form soluble ionic compounds a precipitation reaction is a reaction in which two or more water-soluble ionic compounds react in aqueous solution to form one or more insoluble precipitates. a precipitate is a solid that separates from a solution a species
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thought was the right thing to do. Gandhi strongly opposed of unfair laws in India with anti-violence‚ even through severe beating and going to jail several times. No matter what other people told him‚ he was never wavered to stop his anti-violence curriculum to achieve his goal to free India of unfair laws. Gandhi even took action of a Salt March which was a walk to the very edge of a coastal sea in order to protest against the law‚ which was the banning of making salts in their own country.
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or P-O (b) Si-O or C-O (c) C-F or C-Br (d) the C=C bond or the C=N bond in acrylonitrile‚ H2C=CH-C=N 37) Compare the nitrogen bonds in hydrazine‚ N2H4‚ and in “laughing gas” N2O. In which molecule is the nitrogen-nitrogen bond shorter? In which should the bond be longer? 38) Consider the carbon-oxygen bonds in formaldehyde‚ H2CO‚ or the bond in carbon monoxide‚ CO. In which molecule is the carbon-oxygen bond shorter? The bond is shorter in CO 42) Estimate ΔHº for forming 2 mol ammonia from molecular
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Should we admire heroes but not celebrities? Plan and write an essay in which you develop your point of view on this issue. Support your position with reasoning and examples taken from your reading‚ studies‚ experience‚ or observations. The term "hero" comes from the ancient Greeks. For them‚ a hero was a mortal who had done something so far beyond the normal scope of human experience that he left an immortal memory behind him when he died‚ and thus received worship like that due the gods
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launch to Mars takes place in 2025 there’s no turning back. When you go to Mars‚ you stay there and die there. For example‚ Mars one also dosn’t have enough money for this event. As the astronauts can see‚ the trip to Mars is very risky for many reasons. Obviously Mars one isn’t prepared for this huge project. The Mars One project is extremely risky for many reasons and no one should be aloud to go to Mars‚ this project should be canceled because of lack of medical attention‚ not smart enough technological
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Should We Switch From Nonrenewable to Renewable Energy Research Question: What are the differences between renewable and nonrenewable energy and should renewable energy be promoted? I. Thesis statement: The side effect of extracting nonrenewable energy‚ the advantages of using renewable sources in producing energy and the capacity of both of them are the three main points that have pushed engineers to focus and to improve the field of energy. II. Introduction of energy Source: (Touryan
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