Supplemental Questions 1. A newer form of the periodic table has been established‚ but is not universally used at this time. Go to http://www.sciencenews.org/view/generic/id/67938/description/Periodic_table_gets_some_flex and read the article to answer the following questions: a. What has been added to the new table? The atomic weights of oxygen‚ hydrogen‚ lithium‚ boron‚ carbon‚ nitrogen‚ silicon‚ sulfur‚ chlorine and thallium are now be expressed as intervals. b. Why is this addition important
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Basic Stoichiometry PhET Lab Let’s make some sandviches! Introduction: When we bake/cook something‚ we use a specific amount of each ingredient. Imagine if you made a batch of cookies and used way too many eggs‚ or not enough sugar. YUCK! In chemistry‚ reactions proceed with very specific recipes. The study of these recipes is stoichiometry. When the reactants are present in the correct amounts‚ the reaction will produce products. What happens if there are more or less of some of the reactants
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Phenol‚ also a strong electron donating group had a melting point similar to the literature value for 2‚4‚6-tribromophenol. This was expected since phenol is strongly activating and would add bromine to all ortho‚ para positions. Acetanilide is not as strongly activating‚ and is sterically hindered with a bulky group. Thus the melting point is the same as the literature value for 4-dibromoacetanilide which adds to the para position. Similarly
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be eliminated or destroyed‚ and thus were soon advised to clean wounds and apply remedies as soon as soldiers showed signs of disease.18 Some physicians discovered the use of bromine as a sanitizing agent. William Hammond found that bromine “prevented sloughing”19 after amputations; Middleton Goldsmith placed bottles of bromine in each of the wards‚ and noted that “within 24 hours [he] saw a marked change for the better in all the patients since not one had died in the barracks from this disease except
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Relative Reactivity of Anilines Abstract: Various Anilines were tested with Br2/HBr solution‚ the products were crystallized and melting points attained to verify relative reactivity. My assignment‚ 2‚4-Dibromoanisol‚ was prepared in a yield of 52% with a melting point of 55-58 C . Reaction: Mechanism: Procedure: Anisole (0.35mL‚ 0.0378mol) was obtained and placed in a pre-weighed 25 mL round bottom flask‚ along with 2.5 mL of glacial acetic acid and a magnetic stir bar. Then the
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Elements classified as Metalloids The 7 elements classified as "Metalloids" are located in Groups 13‚ 14‚ 15‚ 16 and 17 elements of the Periodic Table. Elements classified as Metalloids have properties of both metals and non-metals. Some are semi-conductors and can carry an electrical charge making them useful in calculators and computers The Metalloids are: Boron Silicon Germanium Arsenic Antimony Tellurium Polonium Elements classified as Alkali Metals The 6 elements classified
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oxidation of p-xylene by oxygen in air: Diagram 3.1 The process uses cobalt-manganese-bromide catalyst. The bromide source can be NaBr‚ HBr or tetrabromoethane where bromine functions as a regenerative source of free radicals. In this process‚ acetic acid is the solvent and oxygen from compressed air is the oxidant. The combination of bromine and acetic acid is found to be highly corrosive and hence the equipment is lined with titanium. (http://en
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nitric acid to zinc granules adding concentrated sulphuric acid to solid sodium bromide adding concentrated sulphuric acid to magnesium adding iron(II) nitrate solution to acidified potassium permanganate solution adding sodium sulphite solution to bromine water adding hydrogen sulphide to acidified potassium dichromate solution adding oxygen to potassium iodide in alkaline medium to give iodine and hydroxide adding carbon to concentrated sulphuric acid adding copper to silver nitrate
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Q. 1. During the electrolysis of molten lead bromide‚ which of the following takes place : A : Bromine is released at the cathode. B: Lead is deposited at the anode. C : Bromine ions gain electrons. D: Lead is deposited at the cathode. Ans : - D. Q. 2. Here is an electrode reaction : Cu → Cu2+ + 2e-. [i.e. Cu- 2e- →Cu2+]. At which electrode(anode or cathode) would such a reaction take place. Is this an example of oxidation or reduction. Ans : - At anode. Oxidation. Q. 3. A solution contains
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Experiment 5- Competing Nucleophiles Table of results: Area (mm²) Percent composition 1-bromobutane 511 85.02% 1-chlorobutane 90 14.98% 2-bromobutane 432.25 78.63% 2-chlorobutane 117.5 21.37% 2-bromo-2-methylpropane 280 37.58% 2-chloro-2-methylpropane 465 62.42% Discussion: 1. In 1-butanol Base on the data table‚ 1-bromobutane dominated the composition of 85.02%‚ which indicates the conclusion that the mechanism for 1-butanol is SN2‚ and bromide is a better nucleophile
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