Questions asked by S

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• For the Lyman series, #n_f = 1#. How can we calculate the #E_"photon"# for the bandhead of the Lyman series (the transition #n = oo -> n = 1# for emission) in joules and in eV?
  
• Why do you think it takes about half the energy to remove the first electron, compared to the energy needed to remove the last electron?
  
• Would it make a difference if you waited before putting the metal in the water? Why?
  
• What is the Lewis Dot Structure of (CH3)2SeCl2?
  
• What do you predict you would observe if you put a piece of Ba metal in water, with a phenolphthalein indicator? Would it heat up? Would gas form? Would the solution change color? Would the appearance of metal change?
  
• How would you prove the following?
  
• How do you prove the following?
  
• How to prove the following?
  
• How to expand 3 variables using Pascal's triangle?
  
• How to solve for x?
  
• How to expand using Pascals Triangle?
  
• How to solve for x?
  
• 1. Based on the measured molality of the solution, what is the solvent mass in kg? 2. How many moles of water is that? 3. How much water remains in the solid? 4. Based on the results of (c), suggest a composition for the residual solid.
  
• Which of the molecules below has the highest boiling point?
  
• How to calculate amount of NaCl needed?
  
• How to find molality?
  
• A pure sample of the solvent phenol has a freezing point of 40.85 C. A 0.414 molal solution of isopropyl alcohol in phenol was observed to have a freezing point of 38.02 C. What is the freezing point depression of this solution?
  
• Can you use calcium hydroxide instead of sodium hydroxide?