Types of Chemical Reactions: Single and Double Displacement

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Presentation transcript:

Types of Chemical Reactions: Single and Double Displacement

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

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)

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

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

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.

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

HOMEWORK Pg. 241 # 1-3