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If phosphorus has a -3 charge, how many protons and electrons does it have? 

Classify the following equation: H2SO4 +  2 NH3 -> (NH4)2SO4.

Which of the following is categorized as homogeneous / pure substance / element? 

In the reaction P4 + 5 O2 -> 2 P2O5       how many moles of oxygen are needed to produce 2 moles of P2O5?

Calculate the pH of a solution with [H+] = 1.45 x 10-10 M.  b) Is the solution acidic, basic, or neutral? 

What is the molarity of a solution that contains 2.17 moles of SrCl2 in 2,660 mL of solution? 

Which is larger in size Ca+2 or Ca?

Draw the Lewis structure (structural formula) of CCl4. Then figure out the molecular geometry of CCl4 from the structure you draw.

Explain how to create a crystal in the lab (Hint: think about how saturated a solution is).

How many atoms of copper will react with 33.9 L of nitrogen at STP to produce copper(I)nitride?  6  Cu       +      1 N2       ->    2  Cu3N