Chapter 6: Chemical Reactions
Date:____________
Section 7: Double Displacement – Gas Producing Reactions - Notes
Objectives:
 Identify and write equations for gas evolution reactions.
Gas Producing Reactions:

Gases that are commonly produced are _____________________________________________,
___________________________________, __________________________________________,
___________________________________, and ______________________________________.
o

Example:
Many gas producing reactions occur when a ___________________________ from a double
displacement reaction _____________________________.
o
Begin by writing a skeletal equation that includes the reactants and products that form
when the cation of each reactant combines with the anion of the other.

o
You must recognize that H2CO3(aq) ___________________________ into ____________
and ________________ and write the corresponding equation.

o
HNO3(aq) + Na2CO3(aq) →
Finally, balance the equation.

HNO3(aq) +
Na2CO3(aq) →
Types of Compounds that Undergo Gas Evolution Reactions
H2O(l) +
CO2(aq) +
NaNO3(aq)
Practice: Write chemical, complete ionic, and net ionic equations for each of the following reactions.

Perchloric acid reacts with aqueous potassium carbonate, forming carbon dioxide gas and
water.

Nitric acid reacts with aqueous sodium carbonate.

Aqueous hydrobromic acid reacts with aqueous potassium sulfite.