permanganate to the solution that changed color in the previous step. Record how many drops were added until the purple color of the ion no longer changed. 6. Observe color changes when sodium iodide solution is reacted with chlorine water and bromine water (separately). 7. Observe color changes when sodium bromide solution is reacted with chlorine water and iodine solution (separately). 8. Observe what happens when 3M sulfuric acid and potassium permanganate are added to hydrogen peroxide
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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)
Free Atom Electron
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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Yeast and Sugar - The Chemistry must be right Jansen‚ C. Gymnasium Felisenum‚ The Netherlands 14-04-2010 Summary Yeast can metabolize sugar in two ways‚ aerobically‚ with the aid of oxygen‚ or anaerobically‚ without oxygen. In this experiment yeast ferment sugars anaerobically. When yeast ferments the sugars anaerobically‚ however‚ CO2 production will cause a change in the weight of the sugar/yeast-solution. This raises a further question: What is the effect of different kinds of sugars
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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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Experiment 39 Oxidation – Reduction Titrations II : Analysis of Bleach A. Standardization of 0.05 M Na2S2O3 Solution KIO3 concentration 0.01 M Volume of KIO3 Trial #1 Trial #2 Final burette reading 15.01 mL 30.00 mL Initial burette reading 0.00 mL 15.01 mL Milliliters of KIO3 used 15.01 mL 14.99 mL Volume of Na2S2O3 Trial #1 Trial #2 Final burette reading 13.40 mL 25.78 mL Initial burette reading 0.03 mL 13.37 mL Milliliters of Na2S2O3 used
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use of the Grignard reagent phenyl magesium brominde. The organometallic grignard reagent was synthesized by use of a reflux apparatus recrystallization techniques. Once synthesized it was used in a Grignard reaction that involved nucleophilic addition to a carbonyl in order to make triphenylmethanol. The final product was solidified and recrystallized and spectral data was obtained to confirm its presence. Introduction: Carbon-carbon bonds are the basis of organic chemistry. Attaching
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KAROT OR ASIATIC BITTER YAM (Dioscorea hispida dennst) AS A RAT KILLER CHAPTER I Introduction Health is wealth. Food plays very vital role in maintaining proper health. If we don’t have it‚ we will surely die. In our country‚ Philippines‚ we cannot finish a meal without having the food called rice. Not only in Philippines but rice is also a global staple food. The country is the 8th largest rice producer in the world‚ accounting for 2.8% of global rice production. Rice is an
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