Bellwork 1-25 - Write that formula!
1.
2.
3.
4.
5.
6.
Iron (II) sulfate FeSO4
Sodium carbonate Na2CO3
Carbon monoxide CO
Hydrosulfuric acid H2S
Nickel (III) nitrate Ni(NO3)3
Dihydrogen monoxide H2O
Write and Balance
•Propane (C3H8) combusts with
oxygen gas
1. Zinc mixes with hydrochloric acid 
zinc (II) chloride and hydrogen gas
2. Copper (II) sulfate + potassium nitrate
 copper (II) nitrate and potassium
sulfate
Write and balance
1.Magnesium mixes with iron
(III) chloride
3Mg + 2FeCl3  3MgCl2 + 2Fe
2.Potassium chloride combines
with calcium carbonate
2KCl + CaCO3  K2CO3 + CaCl2
Salts (Ionic compounds) in Solution
• Draw a picture of what happens to MgCl2
when you add it to water
Mg+2
Cl-
Cl-
Ca+2
Ca+2
Ca+2
PO43-
PO43-
• What happens to Ca3(PO4)2 when you
add it to water?
http://phet.colorado.edu/en/simulation/s
ugar-and-salt-solutions
Aqueous solutions (aq)
• Ionic compounds dissolved in
water
Single Replacement Rxns
Zn (s) + CuSO4 (aq)  ZnSO4 (aq) + Cu (s)
Zn
SO42-
Cu2+
Cu
Zn2+
SO42-
http://group.chem.iastate.edu/Greenbowe/sections/projectfolder/animatio
ns/ZnCutransfer.html
• Write and balance :
▫ Zinc (solid) combines with Copper (II)
chloride (aqueous) to produce copper
(solid) and zinc (II) chloride (aqueous)
Zn (s) + CuCl2 (aq)  Cu (s) + ZnCl2 (aq)
• Write and balance :
▫ Solid lead is mixed with Silver (I) nitrate
(aqueous) solution  lead (II) nitrate
(aqueous) and _____?
Pb(s) + 2AgNO3 (aq)  Pb(NO3)2 (aq) + 2Ag(s)
NaCl(aq) + CaS (aq) 
“ionic
equation”
Na+
K+
Ca2+
S2-
Na+ + Cl- + Ca2+ + S2-  ?

+
NaCl
CaS
CaCl2 (s)
+
+
NaS(aq)
1.
2.
3.
2 aqueous solutions
Both couples break up
One new couple gets married
(solid) =precipitate (ppt)
Pb(NO3)2 (aq) + 2NaI(aq)
+ 2NaNO3 (aq)
NO3-
PbI
2
PbI
PbI22
PbI2
Na+
Pb(NO3)2 (aq) + 2NaI (aq) PbI2 (s) + 2NaNO3 (aq)
Pb2+ + 2NO3- + 2Na+ + 2I-
PbI2 (s) + 2Na+ + 2NO3-
ionic equation
PbI2
Pb2+ + 2I-
PbI2 (s)
net ionic equation
Na+ and NO3- are spectator ions
Spectators Ions: Never precipitate!
(hate commitment)
How do you know which ones are
spectators?
Ag+
Cl-
NO3-
Pb2+
?
K+
Soluble= dissolves in water
Objective: determine which ions are
spectators (soluble= never precipitate)
Ag+
Cl-
NO3-
Pb2+
?
K+
1. Does Ag ppt?
2. Does Pb ppt?
3. Does Cl ppt?
4. Does I ppt?
Spectators (don’t ppt)
• Nitrates (NO3)
• Alkali metals (K, Na, etc)
• Acetate (C2H3O2-)
• Ammonium (NH4+)