Download Worksheet #2

Unit 7—Chemical Reactions
Name
Pre-AP Chemistry: Worksheet #2
Class Period
1.
Explain why subscripts should never be changed when balancing an equation.
2.
Balance the following equations:
3.
a.
U(s)
+
F2(g)
b.
Mg3N2
c.
(NH4)2SO4
d.
CH3OH(l)
e.
Al
f.
MnO2
g.
Al2(SO4)3
h.
AgCl
i.
(NH4)2CO3→
j.
FeS2
+
H2O
+
+
+
+
→MgO
O2(g)
HCl→
+
UF6(g)
NaOH→
NaOH
+
+
→
+
NH3
O2→
NH3
NH3
→
+
H2O
CO2(g)
H2O
MnCl2
Ca(OH)2→
NH4OH
+
+
+
H2O(l)
→NaAl(OH)4
+
H2O
+
Al(OH)3
+
CaSO4
→Ag(NH3)2Cl
+
H2O
+
Fe2O3
H2O
+
+
Na2SO4
+
H2
Cl2
CO2
SO2
Write balanced chemical equations for the following reactions.
a.
Magnesium metal and water combine to form solid magnesium hydroxide and hydrogen gas.
Mg(s) + 2H2O(l) → Mg(OH)2(s) + H2(g)
b.
An aqueous solution of hydrogen peroxide (dihydrogen dioxide) and solid lead(II) sulfide combine to
Unit 7—Chemical Reactions
form solid lead(II) sulfate and water.
4H2O2(aq) + PbS(s) →
PbSO4(s) + 4H2O
(l)
c.
Lithium solid reacts with water to produce aqueous lithium hydroxide and hydrogen gas.
2Li(s) +2H2O(l) →2LiOH(aq) + H2(g)
d.
Solid copper(I) sulfide and oxygen gas react to form solid copper(II) oxide and sulfur dioxide gas.
Cu2S(s) +2O2(g) →2CuO(s) + SO2(g)
e.
Solutions of ammonium nitrate and sodium hydroxide are combined to produce ammonia gas, water
and aqueous sodium nitrate.
NH4NO3(aq) + NaOH(aq) → NH3(g) + H2O(l) + NaNO3(aq)
f.
Solid calcium carbide, CaC2, reacts with water to produce acetylene gas, C2H2, and aqueous calcium
hydroxide.
CaC2(s) + 2H2O(l)
g.
→
C2H2(g) + Ca(OH)2(aq)
Aqueous aluminum nitrate and aqueous sodium hydroxide react to produce solid aluminum hydroxide
and aqueous sodium nitrate.
Al(NO3)3(aq) + 3NaOH(aq) → Al(OH)3(s) + 3NaNO3(aq)
h.
Solid barium chlorate, when heated, produces solid barium chloride and oxygen gas.
∆
Ba(ClO3)2(s) → BaCl2(s) + 3O2(g)
i.
Solution of hydrochloric acidand barium hydroxide react to form aqueous barium chloride and water.
2HCl(aq) + Ba(OH)2(aq) → BaCl2(aq) + 2H2O(l)
j.
Dinitrogen tetroxide gas decomposes into nitrogen dioxide gas.
N2O4(g) → 2NO2(g)
k.
An aqueous solution of magnesium chloride is added to a silver nitrate solution. Aqueous magnesium
nitrate and solid silver chloride form.
MgCl2(aq) + 2AgNO3(aq) → Mg(NO3)2(aq) + 2AgCl(s)