Questions asked by Justin

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• The quantum numbers n = 4, l = 1, m_l = 0 could represent a valence electron in which atom in its ground state?
  
• What is the condensed electron configuration of praseodymium?
  
• What is the concentration of a solution of K2CO3 that has pH = 11.90? (For H2CO3, Ka1 = 4.2 x 10–7, Ka2 = 4.8 x 10^–11.) (A) 3.0 x 10^–1 M (B) 2.6 x 10^–2 M (C) 7.9 x 10^–3 M (D) 1.3 x 10^–12 M
  
• What is the formal charge on the central nitrogen in the Lewis structure of N2O?
  
• In a ground-state #"P"# atom in the gas phase, how many electrons have the quantum numbers #n = 3, l = 1, m_l = –1# ?
  
• Why does NH3 have a larger bond angle than PH3?
  
• How much aluminum metal is plated?
  
• What is Rf in chromatography?
  
• What are the two most common oxidation states for antimony?
  
• The half-life of a first-order reaction is 1.5 hours. How much time is needed for 94% of the reactant to change to product?
  
• What gas is produced when dilute HNO3 is added to silver metal?
  
• Why does hydrogen bonding occur?
  
• What is the conjugate acid of NH4+ in the reaction NH4+ + OH- -> H2O + NH3?
  
• What are the conditions for standard enthalpy of formation?
  
• How do molecules vibrate?
  
• Are d electrons considered valence electrons?
  
• Which calcium compound is not appreciably more soluble in 0.1 M hydrochloric acid than it is in pure water?
  
• How do you factor u^3 +v^3 +w^3 −3uvw = (u+v+w)((u+v+w)^2 −3(uv+vw+wu))?
  
• What is nitrogen inversion?
  
• What are standard conditions?
  
• How many stereoisomers of octahedral CoCl2(NH3)2(CN)2– are possible?
  
• Why is a reaction spontaneous when Delta G < 0?
  
• Why are most solids more dense than liquids, and why is water an exception to this?
  
• How do we choose suitable indicator for titration of weak acid with strong base?
  
• What is ring strain?
  
• Why are polar substances soluble in water?
  
• What is the function of acid catalyst in esterification reaction?
  
• Why can rechargeable batteries only be recharged a certain amount of times?
  
• Which of the following oligonucleotides would have the highest melting point when paired with the proper complementary strand?
  
• How does CO act as a ligand?
  
• In a reaction A -> B with Delta G < 0, why is there equilibrium instead of going to completion?
  
• Why does boiling saltwater remove salt from water?
  
• In Cu2+ reacting with I-, why is CuI formed instead of CuI2?
  
• Why is CuI2 unstable?
  
• What is observed when adding ammonia to Cu2+ solution, and why does this happen?
  
• What color is observed when lithium is added to water?
  
• What happens when aluminum is added to sodium hydroxide?
  
• Is a solution of a weak acid considered a buffer solution?