Download Honors Chemistry Chapter 8 Homework Solutions 1. The evolution

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Honors Chemistry
Chapter 8 Homework Solutions
1. The evolution of energy, the production of a gas, the formation of a precipitate, a color change
7.
a. A solution in water
b. A substance that accelerates a chemical reaction but can be recovered unchanged
c. A chemical reaction in which the products reform the original reactants
8.
a. KOH
b. Ca(NO3)2
c. Na2CO3
d. CCl4
e. MgBr2
f. SO2
g. (NH4)2SO4
12. By the addition of energy in the form of electricity or heat
13. The decomposition of a substance by an electric current
15.
a. The element’s ability to react
b. For metals, the activity describes the elements ability to lose electrons. For nonmetals, it
describe the ability to gain electrons.
16.
a. A set of elements listed according to the ease with which they undergo certain chemical
reactions.
b. Elements are usually listed in order of their tendency to undergo single-replacement reactions.
An element in such a series can replace any element listed below it.
18.
a. 2ZnS(s) + 3O2(g) →2ZnO(s) + 2SO2(g)
b. 2HCl(aq) + Mg(OH)2(aq) → MgCl2(aq) + 2H2O(l)
c. 2HNO3(aq) + Ca(OH)2(aq) → Ca(NO3)2(aq) + 2H2O(l)
19.
a. Solid zinc sulfide reacts with oxygen gas to form solid zinc oxide and sulfur dioxide gas
b. When solid calcium hydride is added to water, aqueous calcium hydroxide and hydrogen gas
are formed.
c. Aqueous silver nitrate mixed with aqueous potassium iodide produces a precipitate of silver
iodide and aqueous potassium nitrate.
20.
a. H2 + Cl2 → 2HCl
b. 2Al + Fe2O3 → Al2O3 + 2Fe
c. Pb(CH3COO)2 + H2S → PbS + 2CH3COOH
21.
a.
b.
c.
d.
LiO2 is an incorrect formula. 4Li + O2 → 2Li2O
H2Cl2 is an incorrect formula. H2 + Cl2 → 2HCl
MgO2 is an incorrect formula and the equation as written is not balanced. MgCO3 → MgO + CO2
I is an incorrect formula and the equation is not balanced. 2NaI + Cl2 → 2NaCl + I2
24.
a.
b.
c.
d.
2Mg + O2 → 2MgO
4Fe +3O2 → 2Fe2O3
2Li + Cl2 → 2LiCl
Ca + I2 → CaI2
27.
a.
b.
c.
d.
Zn + Pb(NO3)2 → Pb + Zn(NO3)2
2Al + 3Hg(CH3COO)2 → 3Hg + 2Al(CH3COO)3
2Al + 3NiSO4 → 3Ni + Al2(SO4)3
2Na + 2H2O → 2NaOH + H2
28.
a. AgNO3(aq) + NaCl(aq) → NaNO3(aq) + AgCl(s)
b. Mg(NO3)2(aq) + 2KOH(aq) → Mg(OH)2(s) + 2KNO3(aq)
c. 3LiOH(aq) + Fe(NO3)3(aq) → Fe(OH)3(s) + 3LiNO3(aq)
29.
a. CH4 + 2O2 → CO2 + 2H2O
b. 2C3H6 + 9O2 → 6CO2 + 6H2O
c. C5H12 + 8O2 → 5CO2 + 6H2O
30.
a.
b.
c.
d.
e.
33.
a. Zn + S → ZnS synthesis
b. Ca + 2NaNO3 → Ca(NO3)2 +2Na single replacement (this reaction will NOT occur)
c. AgNO3 + KI → AgI + KNO3 double replacement
d. 2NaI → 2Na + I2 decomposition
e. C7H8 + 9O2 → 7CO2 + 4H2O combustion
f. C9H20 + 14O2 → 9CO2 + 10H2O
34.
a. K
H2 + I2 → 2HI synthesis
2Li + 2HCl → 2LiCl + H2 single replacement
Na2CO3 → Na2O + CO2 decomposition
2HgO → 2Hg + O2 decomposition
Mg(OH)2 → MgO + H2O decomposition
b. Al
c. Cr
d. F
e. Ag
f. Cl
g. Sr
h. F
35.
a.
b.
c.
d.
e.
Ni(s) + CuCl2(aq) → NiCl2(aq) + Cu(s)
Zn(s) + Pb(NO3)2(aq) → Zn(NO3)2(aq) + Pb(s)
Cl2(g) + 2KI(aq) → 2KCl(aq) + I2(s)
no reaction
Ba(s) + 2H2O(l) → Ba(OH)2(s) + H2(g)
39.
Pt
40.
2NaCl(aq) + 2H2O(l) → 2NaOH(aq) + H2(g) + Cl2(g)
41.
a.
b.
c.
d.
Ca(OH)2 + (NH4)2SO4 → CaSO4 + 2NH4OH or 2NH3 and 2H2O
2C2H6 + 7O2 → 4CO2 + 6H2O
2Cu2S + 3O2 → 2Cu2O + 2SO2
2Al + 3H2SO4 → Al2(SO4)3 + 3H2
44.
a.
b.
c.
d.
Cu(s) + Cl2(g) → CuCl2(s) synthesis
Ca(ClO3)2(s) → CaCl2(s) + 3O2(g) decomposition
2Li(s) + 2H2O(l) → 2LiOH(aq) + H2(g) single replacement
PbCO3(s) → PbO(s) + CO2(g) decomposition
48.
a. AgNO3 + KI → AgI + KNO3
b. 3NO2 + H2O → 2HNO3 + NO
c. SiCl4 + 2H2O → SiO2 + 4HCl
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