Blog

Which of the following electron configurations is/are correct? 1.  Mo: [Kr]5s24d4 2.  Cr:[Ar]4s13d5 3.  Co:[Ar]4s23d7

What is the molarity of a solution made by mixing 5.25 g of potassium chlorate, KClO3 in enough water to make 285.00 mL of solution?

A researcher runs an experiment that produces 120.5 g of aluminum sulfate when adding 22.5 g of aluminum to excess sulfuric acid according the the following equations.  What is the percent yield of the reaction?  2Al(s) + 3H2SO4(aq) 

Which statement is/are correct regarding an aqueous mixture of Pb(NO3)2 and HBr? i.  The net ionic equation would be:  Pb2+ + Br- –> PbBr2 (s) ii.  lead would be a spectator ion iii.  NO3– would be a spectator ion

A saline solution is prepared by mixing 16.926 g of NaCl into enough water to make 195.00 mL of solution.  275.00 mL of water is then added to the first solution.  What is the concentration of the final solution?

Which of the following statements is/are true? The electron configuration for phosphorous (P) is [Ne]3s23p3  The electron configuration for gallium (Ga) is [Ar]4s24d103p1 The electron configuration for selenium (Se) is [Ar]4s23d104p4  

Identify each of the following compounds as a strong electrolyte, weak electrolyte, or non-electrolyte using the dropdown menu. 1.  KCl is a [1] 2.  C6H12O6 is a [2] 3.  NH3 is a [3] 4.  HBrO3 is a [4]

Which of the following electron configurations is/are correct? 1.  Mo: [Kr]5s14d5 2.  Cr:[Ar]4s23d4 3.  Fe:[Ar]4s23d6

Calculate the frequency associated with orange light (610 nm)? 

Calculate the energy of a photon emitted by a hydrogen atom when the electron falls from the n=12 energy level to the n=5 energy level.