5) Lesson - Double Displacement & Neutralization Reactions Flashcards
A double displacement reaction has takes place when…
A solid (precipitate) forms
A gas is produced
Water is produced (through the process of neutralization)
What occurs in a double displacment reaction?
In this type of reaction, the cations of two different compounds trade places
TRUE OR FALSE: ACTIVITY SERIES IS USED IN DD
FALSE
activity series is NOT used!
An insoluble ionic compound product is called a
precipitate
Two aqueous ionic compounds will only undergo a double displacement reaction if ONE of the products is a….
precipitate
-No Precipitate = No Reaction!
Why is a percipitate needed?
If there were no precipitate, then the four aqueous ions we started with would be completely unchanged!
TRUE OR FALSE compounds are very soluble, so no precipitate forms but reaction still happens
FALSE
NO REACTION occurs
The types of gas production in DD
Direct gas production
indirect
Direct gas production
-Gas is clealry seen in equation
ex: LiH + H2O –> LiOH +H2
RMBR TO TREAT WATER AS H+OH
Hydrides react readily with water to produce…
hydrogen gas
Indirect gas production: H2CO3
H2CO3 is unstable so it breaks down into…
H2O+ CO2
Indirect gas production: H2SO3
H2SO3 is unstable so it breaks down into…
H2O + SO2
Indirect gas production: NH4OH
NH4OH is unstable so it breaks down into…
NH3 +H2O
Gas-Producing Double Displacement Reactions: Sulfides (e.g. Na2S) + Acid–> ????
Hydrogen sulfide, H2S
Gas-Producing Double Displacement Reactions: Carbonates (e.g. Na2CO3) + Acid –> ????
Carbon dioxide, CO2
