Balance the chemical equation: As2O5  +  Ca(OH)2   →  Ca3(AsO4)2  +  H2O The sum of all the coefficients in the balanced equation is: (don’t forget to count coefficients of 1)

Will PbI2 precipitate when the Mixture 2 solutions (10 mL 0.01 M Pb2+  + 5 mL 0.01 M I- in 35 mL water) are combined? Ksp for PbI2 is about 10-8                                              PbI2(s)  ↔  Pb2+(aq)  +  2I-(aq) Choose (A) or (B)

To determine the solubility of a solute in water, one must be prepare a solution that is:

Which of the following statement best represents gamma radiation?

Write the molecular formula for an alkane with 4 carbons.  What is this hydrocarbon called?

Consider the following equilibrium system:                                                                CaCO3(s)  ⇄ CaO(s) +  CO2(g)             Which one of the following changes would cause the above system to shift leftwards (towards reactant)?

According to Lewis theory, a base……

A solution contains equal concentrations of Hg2+(aq), Pb2+(aq) and Fe2+(aq) ions. When a solution of   S2-(aq) is slowly added to this solution, the precipitate which forms first is:  Use: HgS      Ksp = 1.6×10-54           PbS       Ksp = 7.0×10-29             FeSKsp = 3.7×10-19

The Ka for the first dissociation of a polyprotic acid is always _________ compared to the Kafor the second dissociation

A titration was carried out to find the concentration of an unknown base (NaOH) with a known concentration of HCl. Concentration of HCl =0.35 M Volume of HCl dispensed from the buret = 24.35 mL Volume of NaOH added into the beaker = 36.44 mL Calculate the number of moles of NaOH in 36.44 mL