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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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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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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HARVESTING THE OCEAN BY: SHUN ITCHIGAWA AQUACULTURE • the use of agricultural techniques to breed and raise marine organisms. • is the farming of freshwater or marine organisms. -MONOCULTURE -POLYCULTURE what is the important of aquaculture? It supply commercial species to the world’s markets. Common Aquaculture in the World • Fish aquaculture- raising fish commercially in tanks‚ ponds‚ or ocean enclosures. - carp‚ salmon‚ tilapia and catfish. • Raft culture- aquaculture using floating rafts
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Redox Problem Set 1: Reactions and Stoichiometry (All of these questions are no calculator friendly) 1) Give the oxidation number of carbon in each of the following: a) b) c) d) CF2Cl2 Na2C2O4 HCO3-1 C2H6 2) Give the oxidation number of sulphur in each of the following: a) b) c) d) SOCl2 H2S2 H2SO3 Na2S 3) Identify the oxidizing and reducing agents in each of the following: a) b) c) d) 8H+(aq) + 6Cl-1(aq) + Sn(s) + 4NO3-1(aq) SnCl6 -2(aq) + 4NO2(g) + 4H2O(l) 2MnO4-1(aq) + 10Cl-1(aq) + 16H+(aq)
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Mutagens may be of physical‚ chemical or biological origin. They may act directly on the DNA‚ causing direct damage to the DNA‚ and most often result in replication error. Some however may act on the replication mechanism and chromosomal partition. Many mutagens are not mutagenic by themselves‚ but can form mutagenic metabolites through cellular processes. Such mutagens are called promutagens. [edit]Physical mutagens Ionizing radiations such as X-rays‚ gamma rays and alpha particles may cause DNA
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percent by mass of aluminum in Al2O3 is approximately 1) 18.9 3) 47.1 2) 35.4 4) 52.9 What is the approximate percent composition by mass of CaBr2 (formula mass = 200)? 1) 20% calcium and 80% bromine 2) 25% calcium and 75% bromine 3) 30% calcium and 70% bromine 4) 35% calcium and 65% bromine What is the empirical formula for C3H6? 1) CH 2) CH2 3) CH3 4) CH6 Which represents both an empirical and a molecular formula? 1) P2O5 2) N2O4 3) C3H6 4) C6H12O6 The number of atoms in 2
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reactions of 1- and 2-Bromobutane with potassium tert-butoxide occur through an E2 mechanism. In the dehydrobromination of 1-bromobutane‚ potassium tert-butoxide‚ a strong base‚ deprotonates the beta carbon while bromine leaves‚ forming a monosubstituted alkene. Because the leaving group‚ bromine‚ in 1-bromobutane is located on the first carbon‚ the formation of a disubstituted alkene is not possible‚ which is why the gas chromatogram for this reaction should only have one peak‚ suggesting only one product
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Experiment # 1 Date: 18/12/13 Title: Chemical Properties of Alkanes. Aim: To test the reactivity of alkanes using cyclohexane as an example. Apparatus/Materials: Cyclohexane‚ liquid alkane‚ aqueous bromine‚ test tubes‚ light source‚ watch glass‚ splint‚ 0.1 MKMnO4‚ concentrated H2SO4‚ dilute H2SO4. Method: Combustion: 1. A watch glass was placed on a benched protection sheet in a fume cupboard and the extractor in the fume on. 2. 4 drops of cyclohexane was placed on the watch glass using
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Exam 1A-CHEM 1150 F12 Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Which of the following elements is a metal? A) As B) Se C) Sn 1) D) C E) I 2) Determine the mass of an object that has a volume of 88.6 mL and a density of 9.77 g/mL. A) 298 g B) 568 g C) 907 g D) 1100 g E) 866 g 2) 3) A student performs an experiment to determine the density of a sugar solution. She
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