DOUBLE REPLACEMENT
as the name infers, this type of reaction occurs between two different compounds.
the new compound forms by exchanging atoms or groups-"swap" partners!
AB + CD -> CB + AD
======> [AgNO 3 + NaCl -> AgCl + NaNO 3] <======
Here are some practices:
NaCl + H2SO4 -> ___________________
Ba(NO3)2 + Na2SO4 -> _______________
what you are looking for is two COMPOUND reacting!
How to determine if a DR actually occured?
reactant changes state during the reation = there is reaction
no change of state = no reaction
How to determine the states?
use [Table of Solubilities]: aq or s
1. find anion in the left hand column
2. look for cation in 2nd column
3.follow its presence or absence to the word "soluble or not soluble"
4.if soluble, compound is aq
5.if insoluble, the compound is s
Writing a NET equation
When you have a precipitation, there is a NET equation
key: aq ions that are the same on both sides get cancelled
Practice:
2Na3PO4 (aq) + Ca9NO3)2 (aq) -> 6NaNO3 (aq) + Ca3(PO4)2 (S)
NET equation: 3Ca 2+ (aq) + 2 PO4 3- (aq) -> Ca3(PO4)2 (s)
Neutralization
a special DR where acid react with bases to produce water and an ionic salt!
2HBr + Sr(OH)2 -> SrBr2 + 2H2O
Combustion
involves chemicals to be burned and oxygen.
AB + O2 -> AO + BO
==========>[C4H8 + 6O2 -> 4CO2 + 4 H2O]<=========
Practices:
1. AgNO3(aq) + K2CO3(aq) ----->
2. Al(OH)3 + H2SO4(aq)
3. Ba3(PO4)2(aq) + K2CO3(aq)
3. Ba3(PO4)2(aq) + K2CO3(aq)
4. HCl + NaOH
5. 2HCl + Mg
That's all for today's CHEM lesson.
---Thanks for reading ---
WHAT TYPE of REACTION is THIS?? just for pure fun 
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