Question

1. [6.4% ) Write down the electron configuration for Br. 2. [6.4 %) Draw resonance structures for (a) NO:, (b) NNO (a) N-NEO (b) NN-o 3. [6.4%) In which pair do both compounds exhibit predominantly covalent bonding? A. BaCl and H-O B. NaBr and SO C. K O and NBr D. CCl and Asl 4. [6.4 % ) Rank the following hydrocarbons in order of increasing vapor pressure: CHe, CvoH, CH, CH16, C22H 5. [6.4%) O and N2 in air can be separated based on the difference in their boiling points. Which species has the higher boiling point and why? A. Oxygen, because it experiences stronger dispersion forces B. Oxygen, because it experiences weaker dispersion forces C. Nitrogen, because it experiences stronger dispersion forces RNitrogen, because it experiences weaker dispersion forces f a metal that crystallizes in a face-centered cubic an a side. C. KoO and NB D. CCIs and Asl 4. 16.4%) Rank the following hydrocarbons in order of increasing vapeor pressure C C c CHi CaaH 16.4%) O and N, in air can be separated based on the dimerence in their boiling pointswhc pc has the higher boiling point and why? Oxygen, because it experiences stronger dispersion forces A. B. Oxygen, because it experiences weaker dispersion forces Nitrogen, because it experiences stronger dispersion forces C. D. Nitrogen, because it experiences weaker dispersion forces 6. 19 %) Calculate the radius (in pm) of an atom of a metal that crystallizes in a face-centered cubic structure for which x-ray diffTraction indicates that the unit cell is 512 pm on a side. [6.4%) State in one sentence what makes metals good electrical conductors. 7. [6.4%) State in one sentence what condition would prohibit the use of a thermoplastic polymer? 8. [6.4%) Non-metals have small band gaps and do not conduct electricity. a. True 9. False b. 10. [6.4%) The entropy increases during which one of the following processes: A. Freezing liquid water B. Dissolving sodium chloride crystals into liquid water C. Expanding argon gas isothermally from 2 bar to 1 bar D. Chilling a steel ball bearing from 100 oC to 25 oC a protein from an aqueous solution E. Crystallizing 11. [10%] An iron piston in a compressor has a mass of 3.62 kg. If the specific heat of iron i how much heat is required to raise the temperature of the piston from 12.0C to 111.0°C 12. 17.4%] Sulfur trioxide can be removed from the exhaust gases of power plants by reaction with lime according to the equation, CaO(s) +SO(g)-CaSO(s), with AH 886 kJ. If 240 kg of SO, is to be removed, how much heat is released? Hint: convert the 240Kg to moles, first. 13. [6.4 %] Determine the change in Gibbs free energy (in kJ/mol) for the mixing of ice and liquid the normal melting point of water. water at 14. [10%) Consider the following reaction: 2 Fe(s)+3 CO2(8) - Fe O,(s ) +3 COg) What must be the temperature (in K) if A-45.5 kJ/mol, Ah; - 248 kJ/mol and -152ml-K

Answer 1

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