2.30 7.04 7.38 12.27 12.62 6. Which of the following combinations would be the best to buffer an aqueous solution at a pH of 5.0? (Points : 10) H3PO4 and H2PO4-‚ Ka1 = 7.5 10-3 HNO2 and NO2-‚ Ka = 4.5 10-4 CH3CO2H and CH3COO-‚ Ka = 1.8 10-5 H2PO4- and HPO42-‚ Ka2 = 6.2 10-8 NH4+ and NH3‚ Ka = 5.7 10-10 7. A 50.0 mL sample of vinegar is titrated with 0.774 M NaOH(aq). If the titration requires 41.6
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formula SO2. SO2 is produced by volcanoes and in various industrial processes. Since coal and petroleum often contain sulphur compounds‚ their combustion generates sulfur dioxide. Further oxidation of SO2‚ usually in the presence of a catalyst such as NO2‚ forms H2SO4‚ and thus acid rain.[2] This is one of the causes for concern over the environmental impact of the use of these fuels as power sources. • Nitrogen oxides (NOx) - especially nitrogen dioxide are emitted from high temperature combustion
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inflammatory agent. Reducing inflammation can reduce soreness and improve recovery time. MRI NO2 was the first big time nitric oxide bodybuilding supplement. It was all the rage for
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form sigma bonds leftover p orbitals on each carbon form a pi bond. 4. Consider the following species – BF4 - ‚ SiH4 ‚ PCl4+ ‚ PCl4- ‚ NF3 ‚ NO2- . In which of these does the central atom violate the “octet rule”? A. PCl4+ ‚ PCl4- ‚ NF3 & NO2- B. BF4 - ‚ SiH4 ‚ PCl4+ C. PCl4+ ‚ PCl4- ‚ NF3 D. PCl4- E. PCl4+ ‚ PCl4- & NO2- 5. Consider the following species SnO2 ‚ O3 ‚ CO32_ ‚ NH3 ‚ ICl4- Which of these have a net molecular dipole moment? A. All of them B
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9.1 Orbitals and Theories of Chemical Bonding 1. Which one of the statements concerning valence bond (VB) and molecular orbital (MO) bond theories is correct? a) MO theory predicts that electrons are localized between pairs of atoms. b) In VB theory‚ bonding electrons are delocalized over the molecule. c) MO theory accurately describes bonding in O2 and NO‚ VB theory does not. d) VB theory can describe molecular bonding in excited states. e) MO theory is used to accurately predict
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atmosphere‚ where they mix and react with water‚ oxygen‚ and other chemicals to form more acidic pollutants‚ known as acid rain Precipitation with a pH less than 5.6 Write the reactions of CO2‚ SO2‚ and NO2 with water CO2 in water: CO2 + H2O H2CO3 SOX in water: SO2 + H2O H2SO3 NOX in water: 2 NO2 + H2O HNO3 (nitric acid) + HNO2 (nitrous acid) Explain how carbon dioxide‚ sulfur oxides‚ and nitrogen oxides enter the atmosphere Carbon dioxie living beings‚ industries‚ automobiles‚ burning
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2KBrO3(s)--------> 2KBr(s) + 3O2(g) MnBr2(aq) + AgNO3(aq) --------> Mn(NO3)2(aq) + AgBr(syou Balanced:MnAg2(aq) + 2AgNO3(aq) --------> Mn(NO3)2(aq) +2AgBr(s) 7. How could you distinguish between the gases H2 and NO2? H2is a colorless‚ odorless gas while NO2 has a reddish-brown color and has a pungent toxic odor. 8. Using water‚ how could you distinguish between the white solids KCl and PbCl2? You could distinguish them by their solubility. KCl is water soluble while PbCl2
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recrystallization and melting point was measured. Introduction: Nitration of Methyl Benzoate is one of the examples of Electrophilic aromatic substitutions. The use of a mixture of Sulfuric Acid and Nitric Acid is the classic way to make NO2+. The two main reaction types used for this are both substitutions: Electrophilic Aromatic Substitution and Nucleophile
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AIR POLLUTION Air pollution is the introduction of chemicals‚ particulate matter‚ or biological materials that cause harm or discomfort to humans or other living organisms‚ or cause damage to the natural environment or built environment‚ into the atmosphere. The atmosphere is a complex dynamic natural gaseous system that is essential to support life on planet Earth. Stratospheric ozone depletion due to air pollution has long been recognized as a threat to human health as well as to the Earth’s ecosystems
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------------------------------------------------- ------------------------------------------------- [H3O+] = [OH-] = ------------------------------------------------- 2. A container initially has 0.500 atm NO2. At equilibrium‚ the NO2 pressure is 0.186 atm. Calculate the value of Kp. ------------------------------------------------- ------------------------------------------------- Kp = ------------------------------------------------- 3. Determine
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