Day  115

Hydration:   solution process with water as the solvent.  

Dissociation:  separation of inos that occurs when an inoic compound dissolves.

Spectator ions:  Ions that do not take part in a chemical reaction and are found in solution both before and after the reaction.

Net inonic equation:  includes only those compounds and ions that undergo a chemical change in a reaction in an aqueous solution and does not include spectator ions.

Section Review 1-4   p.446

1.  The positive ends of the water molecules are atrracted to the negative chloride ions and the negative ends are attracted to the positive sodium ions.  

2.  If more energy is released during ion hydration than is needed to separate separate ions and water molecules , the solution process is exothermic.  If less energy is released during ion hydration than is needed to seperate ions and water molecules, the solution process is endothermic.  

3.  Strontium nitrate and water  yeilds  strontium oxide and  2 hydrogen nitrate.
    0.5 moles of strontium ion and 1 mole of nitrate ion

4.  No precipitate will form.  

p. 457  #  1, 2 , 3, 5, 7, 8, 

1.  Before ionic coumpounds dissolve they contain equal amounts of positive and negative charge.  
     
All ionic coumpounds have characteristic lattice structures that are determined by the relative sizes and           charges of their ions.

2a)   Hydration:   solution process with water as the solvent.  
b)  Depends upon the size and charge of the ion.  

3a)  solute-solute,   solvent-solvent,  solute-solvent.
b)  seperation of  ions from the crystal (energy absorbed) ,  seperation of water molecules from each other (energy absorbed),  the hydration of the seperated ions (energy released).  

5a)  Dissociation:  separation of inos that occurs when an inoic compound dissolves.

b)  1 mole of K and 1 mol of CL,  I mol of Ba and 2 moles of F,  I mol of Mg and 2 moles of NO3

7.  K and Ag

8.  includes only those compounds and ions that undergo a chemical change in a reaction in an aqueous solution and does not include spectator ions.