Examine the following molecular-level diagram. Is a chemical reaction
occurring? Explain your answer.
Examine the following molecular-level diagram. Is a chemical reaction
occurring? Explain your answer.
Consider the following equations. For each, decide whether it represents a
chemical reaction or a physical change.
(a)
(b)
(c)
TiCl4(aq) + 2H2O(l)  TiO2(s) + 4HCl(aq)
4Li(s) + O2(g) 2Li2O(s)
+
KBr(s)  K (aq) + Br−(aq)
Write complete, balanced equations for each of the following reactions.
(a)
When solid sodium hydride, NaH, is added to water, hydrogen gas is released and
aqueous sodium hydroxide forms.
(b)
Aluminum metal reacts with chlorine gas to form solid aluminum chloride.
(c)
Sodium metal reacts with oxygen gas to form solid sodium oxide.
(d)
Solid copper(II) nitrate is heated to produce solid copper(II) oxide, gaseous nitrogen
dioxide, and oxygen gas.
Balance each of the following skeletal equations:
Al(s) +
Cl2(g) 
Pb(NO3)2(aq) +
Li(s) + H2O(l) 
AlCl3(s)
K2CrO4(aq) 
LiOH(aq) +
C6H14(g) + O2(g)  CO2(g)
Mg(s) + O2(g) 
Zn(s) +
C2H2(g) +
PbCrO4(s) + KNO3(aq)
H2(g)
+
H2O(g)
MgO(s)
AgNO3(aq)  Zn(NO3)2(aq) +
O2(g) 
CO2(g) +
Ag(s)
H2O(g)
C12H22O11(s) + KClO3(l)  CO2(g) + H2O(g) + KCl(s)
CuCl2(aq) + AgNO3(aq)  Cu(NO3)2(aq) + AgCl(s)
5.69 Which of the following ionic compounds is expected to be soluble in
water?
(a)
CuCl2
(b)
AgNO3
(c)
PbCl2
(d)
Cu(OH)2
5.70 Which of the following ionic compounds is expected to be insoluble
when mixed with water?
(a)
Cr2S3
(b)
Ca(OH)2
(c)
BaSO4
(d)
(NH4)2CO3
5.71 Write a balanced equation to describe any precipitation reaction that
should occur when the following substances are mixed.
(a)
K2CO3(aq) and BaCl2(aq)
(b)
CaS(aq) and Hg(NO3)2(aq)
(c)
Pb(NO3)2(aq) and K2SO4(aq)
5.72 Write a balanced equation to describe any precipitation reaction that
should occur when the following substances are mixed.
(a)
MgSO4(aq) and BaCl2(aq)
(b)
K2SO4(aq) and MgCl2(aq)
(c)
MgCl2(aq) and Pb(NO3)2(aq)
5.91 Indicate whether each of the following substances is an electrolyte or a
nonelectrolyte.
(a)
NaOH(aq)
(b)
HCl(aq)
(c)
C12H22O11(aq) (sucrose solution)
5.92 Indicate whether each of the following substances is an electrolyte or a
nonelectrolyte.
(a)
CH3CH2OH(aq)
(b)
H2O(l)
(c)
NaCl(aq)
5.97
Add the physical state for each substance in the following aqueous
reactions. Then write and balance a net ionic equation for each reaction.
(a)
(b)
Cu(OH)2 + HCl  CuCl2 + H2O
BaCl2 + Ag2SO4 BaSO4 + AgCl
5.98
Add the physical state for each substance in the following aqueous
reactions. Then write and balance a net ionic equation for each reaction.
Cr2(SO4)3 + KOH Cr(OH)3 + K2SO4
K2CrO4 + PbCl2
 KCl + PbCrO4
Na2SO3 + H2SO4 Na2SO4 + H2O + SO2