electron structure/ are the same element/ have the same atomic number/ are isotopes. (Do not accept Y and Z have same no. of e－ in outermost shell) 1 1994 - 7(b) Marking Scheme (i) Bromine exists as simple molecules with weak intermolecular attraction/ weak van der Waal’s force. ∴ it has low b.p. (Do not accept bromine has weak covalent bond.) In Lead(II) bromide‚ the attraction between ions is strong/ ionic bond/PbBr2 has strong electrostatic attraction. ∴ it has higher a m.p. (Do NOT accept lead(II)
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1) tetrarsenic decoxide 2) bromine trioxide 3) boron nitride 4) dinitrogen trioxide 5) nitrogen triiodide 6) sulfur hexafluoride 7) xenon tetrafluoride 8) phosphorous trichloride 9) carbon monoxide 10) phosphorous pentachloride 11) diphosphorous pentoxide 12) disulfur dichloride 13)
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Experiment 1: TLC Analysis of Analgesic Drugs 1/23/2011 Purpose: The goal of this experiment is to test our knowledge and understanding of TLC analysis by having us do a TLC analysis of analgesics to figure out their main chemical components. Calculations: 1.) Rf = Distance spot traveled/ distance solvent traveled Results: Table 1: TLC Analysis Analgesic Drugs | Rf Value | Acetaminophen | 0.323 | Aspirin | 0.597 | Caffeine | 0.081 | Unknown 154 (Plate 1) | 0.081‚ 0.306‚ 0.597
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absorption frequencies in the spectrum‚ and associate each with a specific bond (e.g. O–H‚ C=O). Keep in mind that there are usually only one or two key bands in each spectrum‚ although in some cases you might observe up to three. Do not label the alkane C–H stretch‚ since these bands are present in most organic compounds. 2. Assign a letter from the structures given (A – J). There is only one structure per spectrum. 3. Identify the main functional group present in the structure (i.e. ketone‚ alcohol
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classes namely: Saturated hydrocarbons and unsaturated hydrocarbons. Saturated hydrocarbons are the simplest type of organic compounds. They are hydrocarbons in which all carbon- carbon bonds are single bonds. An example of a saturated hydrocarbon is an alkane. Unsaturated hydrocarbons are hydrocarbons that contain one or more carbon-carbon multiple bonds like double bonds‚ triple bonds‚ or both. Saturated and Unsaturated hydrocarbons have similar physical properties‚ but their chemical properties are different
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IMPORTANT TOPICS OF CHEMISTRY 2009 Chap No.1 Q.1- Define chemistry & branches of chemistry any three? Q.2-Lrean about history of chemistry for short question and fill in the blanks? Q.3 what is scientific method? Define hypothesis and theory? CHAP NO.2 Q.1-Learns about any three laws of chemical combination only statement and example? Q.2-Define chemical reaction and types of chemical reaction with one example for each with the help of chemical equation? Q.3-Define MOLE‚ Atomic no
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INORGANIC CHEMISTRY 1 Lab Report on Oxidation & Reduction I. Metal-Metal Ion Displacement II. Halogen Displacement Reactions INTRODUCTION A series of experiments had been conducted to determine the order of displacement strengths of the metals and halogen chosen for the experiments. A displacement reaction is a reaction in which one element(metal or non-metal) displaces another element(metal or non-metal) from its salt solution. In the displacement reaction of metals‚ the more
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flow allows them to conform to the shape of their containers. Figure 13.5 Both liquids and gases can flow. The liquid on the left is colored water. The gas on the right is bromine vapor. If a gas is denser than air‚ it can be poured from one container into another. These pictures were taken in a fume hood because bromine is both toxic and corrosive. 2. Figure 13.6a eventually moves into the air. The conversion of a liquid to a gas or vapor is called vaporization. When such a conversion occurs
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planet 6. Atomic mass unit—also known as Dalton (symbol: Da) standard unit for measuring or indicating mass on an atomic or molecular scale. 5. Complete the following table: Isotope Atomic No. Mass No. No. of Protons No. of Neutrons No. of Electrons Bromine-81 35 81 35 45 35 Boron-11 5 10.811 5 6 5 Cl 17 35.4527 17 18 17 52Cr 24 52 24 28 24 Ni-60 58 58.6934 28 31 28 Sr-90 38 87.62 38 50 38 Lead-206 82 207.2 82 125 82 6. Explain how ozone is formed in the troposphere. Ozone production
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what is the identity of the element x in the following ions? what are the likely ground-state electron configurations of the following anions N3-: 1s2 2s2 2p6 Se2-: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 5s2 4d4 Identify the element whose 2+ ions has the ground state electron configuration [Ar] 3d^10 Zinc Which has the smaller second ionization energy‚ K or Ca? CaThree atoms have the following electron configuration. a) 1s2 2s2 2p6 3s2 3p3 b) 1s2 2s2 2p6 3s2 3p6 c) 1s2 2s2 2p6 3s2 3p6 4s2
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