Double Replacement
What general form does a double reaction follow?
AB+CD ---> AD + CB
What happens to an ionic compound when it dissolves in water?
The ionic compounds separates into positive and negative ions in water.
Which type of eqaution shows compounds written as whole units?
Molecular equation
What are spectator ions?
Ions that do not participate in the reaction and remain unchanged
Which ion is always Soluble in water NO3- or CO32-?
NO3-(nitrate)
Name one condition that must be met for a double Replacement reaction to occur?
Formation of a precipitate, a gas, or water
Write the dissociation equation for Na2SO4(aq)
Na2SO4 (aq) ---> 2Na+ (aq) + SO42- (aq)
Which equation shows all the aqueous strong electrolytes as ions?
A complete ionic equation
In the reaction NaCl (aq) + AgNO3(aq) ---> AgCl(s) + NaNO3 (aq), which ions are spectator ions?
Na+ and NO3-
Is BaSO4 soluble or insoluble in water?
BaSO4 is insoluble
Why does this reaction occur?
CaCl2 (aq)+ Na2CO3 (aq) ---> CaCO3(s) + 2NaCl (aq)
Because CaCO3 is insoluble and forms a precipitate
Which of the following dissociates in water ?
A) AgCl (s)
B) NaOH (aq)
B) NaOH (aq)
What is the net ionic equation for:
Ba2+ (aq) + (SO4)2- (aq) ---> BaSO4 (s)
Ba2+ (aq) + SO42- (aq) ---> BaSO4 (s)
Which ions cancel when writing a net ionic equation?
Ions that appear unchanged on both sides of the complete ionic equation
Name one exception to the solubility of chlorides (Cl-)
Ag+, Pb2+, or Hg22+
Predict the products of:
K2SO4 (aq) + Pb(NO3)2 (aq)
Why are strong acids written as ions in ionic equations?
Because strong acids completely ionize in water
Write the complete ionic equation for:
HCl(aq) + NaOH (aq) ---> NaCl (aq) + H20 (l)
H+ (aq) + Cl- (aq) + Na+ (aq) + OH- (aq) --> Na+ (aq) + Cl- (aq) + H2O (l)
In a strong acid- strong base neutralization, which ions are spectators?
Na2+ and Cl-
Are carbonates generally soluble or insoluble?
Carbonates are generally insoluble (except Group 1 and NH4+)
Explain why no reaction occurs when NaNO3 (aq) is mixed with KCl (aq).
All products are soluble; no precipitate, gas, or water forms, so no reaction occurs
Which compounds should NOT be dissociated when writing ionic equations?
solids, liquids, gases, and weak electrolytes
Write the net ionic equation for the neutralization of H2SO4 (aq) and KOH (aq).
2H+ (aq) + 2OH- (aq) ---> 2H2O (l)
Why is identifying spectator ions important in AP chemistry?
They are canceled to show only the species actually involved involved in the reaction
Use Solubility rules to determine if a precipitate forms when MgCl2 (aq) reacts with Na2CO3 (aq)
Yes, a precipitate forms.
Net Ionic Equation:
Mg2+ (aq) + CO32- (aq) ---> MgCO3 (s)