Chemistry 11

Today we did the TRU chem contest........challenging!

Next we had some time to work on the Concentration Assignment followed by a short movie on elements in the periodic table.

Selected answers to the Concentration Assignment below:   (make sure you show all your work!)

1) 0.315 M         2) 285 mL     3d) 0.0447 moles of Fe⁺³   
                                                                    0.067 moles of SO₄^-2

4d) (NH₄)₂S ------- 2NH₄⁺  +   S^-2

6) [Cl^-] = 0.160 M             7) Final concentration of Na₂S = 0.72 M

9) When you mix the two solutions together, you must first find the NEW concentration of solution 1 and solutions 2 and then add them together Total LiF after mixing = 0.394 M 

10)  [Cl]=0.774 M