Master iit academy 2nd Floor‚ Samsung Plaza‚ Near Benz Circle‚ VIJAYAWADA PHYSICAL CHEMISTRY (1) Shielding constant σ for Ne is 4.15 and the effective nuclear charge on Na+ and F- are respectively (A) 4.85 6.85 (B) 5.85 6.85 (C) 6.85 4.85 (D) 4.85 4.85 (2) Electron gain enthalpy and ionization energy of an atom are –a and +b eV respectively. The electronegativity of that atom on Mulliken scale is given by (A) a – b (B) (b – a )/2 (C) a + b (D) (a + b)/2 (3)
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Inorganic Nomenclature I. Compound Type Fixed Charge Metal Binary Salts Description Fixed Charge Metal* + a Nonmetal Rule: Full name of the metal + Stem on the nonmetal + the suffix “ide” Formula Name NaCl Sodium chloride CsF Cesium fluoride CaBr2 Calcium bromide MgO Magnesium oxide Li2S Lithium sulfide Al2O3 Aluminum oxide ZnH2 Zinc hydride AgI Silver iodide SrS Strontium sulfide Ca3N2 Calcium nitride K2Te Potassium telluride Na3N Sodium nitride CaC2 Calcium carbide LiH Lithium hydride Mg3P2 Magnesium
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L soln 1 mol Li3PO4 10. If you evaporated 250. mL of a 3.5 M solution of iron (II) nitrite‚ what mass of iron (II) nitrite would you recover? 0.250 L soln x 3.5 mol Fe(NO2)2 x 147.86g Fe(NO2)2 = 130g Fe(NO2)2 1 L soln 1 mol Fe(NO2)2 11. A chemist has 4.0 g of silver nitrate and needs to prepare 2.0 L of a 0.010 M solution. Will there be enough silver nitrate? If so‚ how much silver nitrate will be left over?
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of nitrogen oxide will react with the oxygen to form nitrogen dioxide(NO2) rapidly. If people inhaled a low level of NO2‚ the gas will irritate your eyes‚ nose‚ throat‚ and lungs‚ possibly causing you to cough‚ tiredness‚ and nausea since NO2 is an acidic gas. Also‚ low level of nitrogen dioxide may trigger asthma and causing the formation of fluid inside the lung 1 or 2 days after inhaled. If people inhaled a high level of NO2‚ the gas will cause spasms‚ rapid burning‚ the tissues in the throat and
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Form A Chemistry 100 Introduction to General Chemistry Fall Semester‚ 2010 Exam One‚ 150 points On this page print your name‚ your lab section number‚ and the name of your TA. Also sign this test booklet. Name________________________________Lab section____________TA___________ Signature________________________________________________________________ The exam consists of 21 problems and one extra credit problem. Partial credit is given only for work that is legible and logically and clearly
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carbocation called an arenium ion‚ which is an ion that is the result of an electrophilic attack on a benzene ring. And deprotonation of the arenium ion by a weak base to regain aromaticity. Nitration is defined as replacing a hydrogen with a nitro (NO2) group. Nitration requires the presence of sulfuric acid (H2SO4) as a catalyst. Mechanism of Nitration. A. Overall reaction: B. Mechanism: The nitronium ion is the electrophile generated by the nitric acid/sulfuric acid mixture. The reaction
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INVESTIGATION 12.A Target Skills Determining the reactivity of various metals Testing Relative Oxidizing and Reducing Strengths of Metal Atoms and Ions By observing whether reactions occur between solid metals and metal ions in solution‚ you can determine the order of oxidizing and reducing agents according to strength. Question How can the presence or absence of a reaction provide information about the relative strength of oxidizing and reducing agents? Safety Precautions
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following SKELETON equation: NH3 + O2 NO2 + H2O a) Balance the above equation … what is the molecule ratio? b) What is the ratio of moles of Oxygen used to moles of NO2 produced? c) How many molecules of H2O are produced when 18.3 moles of NH3 are used (assume excess O2)? 17. Draw a particle picture to represent the equation in #16 (above) when given 4 molecules of NH3 and 8 molecules of O2 react to form NO2 and H2O
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symbol for the ion formed by nitrogen is: A. N2- B. N3- C. N3+ D. N2+ E. N- 4 Which of the following combinations of formula and name is incorrect? A. hydroxide ion = OH ̅ B. nitrate ion = NO3 ̅ C. sulfide ion = SO32 ̅ D. nitrite ion = NO2 ̅ E. sulfate ion = SO42 ̅ 5 How many molecules are in 0.25 mole of Na2O? A. 4.5 × 10(23) B. 0.75 C. 1.5 × 10(23) D. 4.2 × 10( ̅ 25) E. 0.25 6 Calculate the molar mass of Na2SO4. A. 94.05 g/mol B. 71.06 g/mol C. 142.05 amu D. 142.05
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CHAPTER I AIR POLLUTANTS: SOURCES AND CONTROL OF GASES Introduction: 1. According to the World Bank‚ in 2007 air pollution cost about 3.8% of China’s 2. gross domestic product‚ mainly from diseases and loss of lives. 3. World Health Organization estimates that in India alone about 500‚000 premature deaths are caused each year by indoor air pollution. 4. Serious respiratory disease-related problems have been identified for both indoor and outdoor pollution in major cities of several countries. 5.
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