1. Types of Chemical Reactions: Single and Double Displacement

2. Single Displacement reactions
Single displacement reactions: are chemical changes that involve an element and a compound as reactants
One element displaces or replaces another element from a compound

3. Single displacement reactions have the following general formula
Z + AB  ZB + A OR
Y + AB  AY + B
Case 1: the metal Z has taken the place of the element A (metal always replaces metal)
Case 2: the non-metal Y has taken the place of element (non-metal always replaces non-metal)

4. Magnesium + silver nitrate  silver + magnesium nitrate
An example: a coil of magnesium ribbon is placed in a solution of silver nitrate
Magnesium + silver nitrate  silver + magnesium nitrate
Mg + 2AgNO3  2Ag + Mg(NO3)2

5. Another example: bromine is added to a solution of calcium iodide
Bromine will replace/displace the iodide ion
Bromine + calcium iodide  iodine + calcium bromide
Br2 + CaI2  I2 + CaBr2

6. Double Displacement Reactions
Double displacement reactions: occur when elements in different compounds displace each other or exchange places
They have the following general formula:
AB + XY AY + XB
A and X are metallic elements while B and Y are non-metallic elements.

7. Example: lead (II) nitrate and potassium iodide
Lead (II) nitrate + potassium iodide  lead (II) iodide potassium nitrate
Pb(NO3)2 + 2KI  PbI2 + 2KNO3

8. HOMEWORK
Pg. 241 # 1-3