theoretical yield)/ theoretical x 100% = percent error Abs. (58.5 – 60)/ 60 x 100 = 2.5% Scheme of the Reaction (Exp.12a/12b): Analysis of Results: In this experiment‚ the compound diphenylacetylene was made by using potassium hydroxide to take the bromine off of the 1‚ 2-dibromo-1.2-diphenylethane. Pyridinium bromide perbromide was used rather than Br2 due to it being a volatile and highly corrosive substance. Calculate the theoretical yield which was 0.107g of diphenylacetylene. Calculate the percent
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was made by German chemist Johann Dobereiner. In 1817 Dobereiner noticed that certain elements that were chemically similar could be grouped together in threes‚ for example‚ calcium‚ strontium‚ and barium; lithium‚ sodium‚ and potassium; chlorine‚ bromine‚ and iodine. In each group of three‚ the atomic weight of one element fell halfway between the atomic weights of the other two elements. Based on his discoveries‚ Dobereiner proposed the Law of Triads in 1829. His work made other scientists want to
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Magnesium is one of the twenty-four elements on earth that are essential for life. It is vital in human metabolism; and if our magnesium levels are too high or too low‚ we could suffer from sleep disturbances. Magnesium is a very common element found on earth that is used for a lot of everyday items. Much of what we have today would not be possible without magnesium. Magnesium was originally discovered by Sir Humphry Davy in 1808‚ but some are not sure if he officially isolated the element. It was
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IGCSE Chemistry 2012 exam revision notes by Samuel Lees Contents: 1. The particulate nature of matter 2. Experimental techniques 2.1 Measurement 2.2 (a) Criteria of purity 2.2 (b) Methods of purification 3. Atoms‚ elements and compounds 4.1 Atomic structure and the Periodic Table 4.2 Bonding the structure of matter 3.2 (a) Ions and ionic bonds 3.2 (b) Molecules and covalent bonds 3.2 (c) Macromolecules 3.2 (d) Metallic bonding 3 Stoichiometry 4
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Lovely Professional University‚ Punjab Course Code Course Title Course Planner Lectures CHE883 ENVIRONMENT CHEMISTRY 15316::Pushp Lata Course Category Tutorials Practicals Credits Courses with numerical and conceptual focus 3.0 0.0 0.0 TextBooks Sr No Title Author T-1 Environmental Chemistry Edition Year Publisher Name Colin Baird‚ Michael Cann 4th 2008 W.H. Freeman and company Reference Books Sr No Title Author Edition
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OxidatiOn and ReductiOn OxidatiOn & ReductiOn 9.2 9 Introduction to oxidation and reduction Redox equations Some common oxidising agents and reducing agents (EXT) 9.3 Reactivity 9.4 Voltaic cells 19.1 Standard electrode potentials (AHL) 9.5 Electrolytic cells 19.2 cORe 9.1 Electrolysis (AHL) TOK Are oxidation numbers real? I remember contemplating on the nature of reality back in Chapters 2 and 4‚ with regard to electrons and hybridization respectively
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Analysis of Lipid through Two-Dimensional Thin Layer Chromatography Myca Pua‚ Ramon Ramos‚ Amanda Redilas‚ Kimleigh Reyes‚ Nathaniel Sim and Clara Tamondong Group 9 2F Medical Technology Biochemistry Laboratory ABSTRACT Lipids constitute a group of naturally occurring molecules that include fats‚ waxes‚ sterols‚ fat-soluble vitamins such as vitamins A‚ D‚ E‚ and K‚ monoglycerides‚ diglycerides‚ triglycerides‚ phospholipids‚ and others. In this experiment lipid was extracted from the egg yolk
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have a shiny appearance * are usually poor conductors of heat and electricity * can be solids‚ liquids‚ or gases at room temperature solid liquid gas sulfur bromine nitrogen carbon oxygen Nonmetals‚ and Metalloids Metalloids: * are located on the solid line that starts
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Table Lab Look up all the halogens‚ give their name and formula. Describe what each one looks like under normal conditions. Halogens contain salts and they are: 1. Flourine F Normal Conditions- Gas 2. Chlorine Cl Normal Conditions- Gas 3. Bromine Br Normal Conditions- Liquid 4. Iodine I Normal Conditions- Solid 5. Astatine At Normal Conditions- Solid Give the names and formulas of three compounds that contain one element from the Noble Gas family. 1. Helium He 2. Neon Ne 3. Argon
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sulfuric acid cyclohexene was obtained from cyclohexanol. And the product was obtained from the simple distillation and later it was reacted with bromine and potassium permanganate. The observations and results were all recorded. Simple distillation was used for distillation technique‚ and the distillate was seperated into test tubes‚ and to the one of them‚ bromine was added‚ and to the another potassium permanganate was added. Permanganate’s color changed from purple to brown‚ and bromium’s color changed
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