Question 1

As a pure element the oxidation number of zinc is ________,but in compounds such as ZnCO3 its oxidation number is ________.

Accepted Answer

A) 0; 0 
B) 0; +1 
C) +1; 0 
D) 0; +2 
E) none of the above 
A) 0; 0 
B) 0; +1 
C) +1; 0 
D) 0; +2 
E) none of the above D

Question 2

The balanced equation for the reaction occurring when calcium nitrate solution is mixed with sodium phosphate solution is

Accepted Answer

A) 3 Ca(NO3)2 (aq)+ 2 Na3PO4 (aq)→ Ca3(PO4)2 (aq)+ 6 NaNO3 (aq). 
B) 2 Ca(NO3)2 (aq)+ 3 Na3PO4 (aq)→ 2 Ca3(PO4)2 (s)+ 6 NaNO3 (aq). 
C) 3 CaNO3 (aq)+ Na3PO4 (aq)→ Ca3PO4 (aq)+ 3 NaNO3 (s). 
D) 3 Ca(NO3)2 (aq)+ 2 Na3PO4 (aq)→ Ca3(PO4)2 (s)+ 6 NaNO3 (aq). 
E) Ca(NO3)2 (aq)+ 2 NaPO4 (aq)→ Ca(PO4)2 (s)+ 2 NaNO3 (aq). 
A) 3 Ca(NO3)2 (aq)+ 2 Na3PO4 (aq)→ Ca3(PO4)2 (aq)+ 6 NaNO3 (aq). 
B) 2 Ca(NO3)2 (aq)+ 3 Na3PO4 (aq)→ 2 Ca3(PO4)2 (s)+ 6 NaNO3 (aq). 
C) 3 CaNO3 (aq)+ Na3PO4 (aq)→ Ca3PO4 (aq)+ 3 NaNO3 (s). 
D) 3 Ca(NO3)2 (aq)+ 2 Na3PO4 (aq)→ Ca3(PO4)2 (s)+ 6 NaNO3 (aq). 
E) Ca(NO3)2 (aq)+ 2 NaPO4 (aq)→ Ca(PO4)2 (s)+ 2 NaNO3 (aq). D

Question 3

Which of the following equations is not balanced?

Accepted Answer

A) 2 Na + 2 H2O → 2 NaOH + H2 
B) C3H8 + 5 O2 → 3 CO2 + 4 H2O 
C) 2 H2 + O2 → 2 H2O 
D) SO2 + O2 → SO3 
E) 2 Al + 6 HCl → 2 AlCl3 + 3 H2 
A) 2 Na + 2 H2O → 2 NaOH + H2 
B) C3H8 + 5 O2 → 3 CO2 + 4 H2O 
C) 2 H2 + O2 → 2 H2O 
D) SO2 + O2 → SO3 
E) 2 Al + 6 HCl → 2 AlCl3 + 3 H2 D

Question 4

The oxidation number of chlorine in the compound FeCl3 is ________.

Accepted Answer

A) -3 
B) -2 
C) -1 
D) +2 
E) +3 
A) -3 
B) -2 
C) -1 
D) +2 
E) +3

Question 5

Which is the correct equation for the reaction of magnesium with hydrochloric acid to produce hydrogen and magnesium chloride?

Accepted Answer

A) Mg + 2 HCl → H2 + MgCl2 
B) Mg + HCl → H + MgCl 
C) 2 Mg + 6 HCl → 3 H2 + 2 MgCl2 
D) Mg + 2 HCl → 2 H + MgCl2 
E) Mg + 3 HCl → 3 H + MgCl2 
A) Mg + 2 HCl → H2 + MgCl2 
B) Mg + HCl → H + MgCl 
C) 2 Mg + 6 HCl → 3 H2 + 2 MgCl2 
D) Mg + 2 HCl → 2 H + MgCl2 
E) Mg + 3 HCl → 3 H + MgCl2

Question 6

When the reaction shown is balanced,there are ________ atoms of oxygen and ________ atoms of hydrogen on each side.
(NH4)2SO4 (aq)+ Ba(C2H3O2)2 (aq)→ BaSO4 (s)+ NH4C2H3O2 (aq)

Accepted Answer

A) 6; 11 
B) 16; 18 
C) 8; 14 
D) 4; 7 
E) 16; 28 
A) 6; 11 
B) 16; 18 
C) 8; 14 
D) 4; 7 
E) 16; 28

Question 7

Which one of the following substances is produced during an acid/base (or neutralization)reaction?

Accepted Answer

A) H2 
B) H2O 
C) CO2 
D) NaOH 
E) NaCl 
A) H2 
B) H2O 
C) CO2 
D) NaOH 
E) NaCl

Question 8

Which of the following is not soluble in water?

Accepted Answer

A) potassium sulfide 
B) iron(II)bromide 
C) iron(III)hydroxide 
D) iron(III)nitrate 
E) ammonium sulfate 
A) potassium sulfide 
B) iron(II)bromide 
C) iron(III)hydroxide 
D) iron(III)nitrate 
E) ammonium sulfate

Question 9

The oxidation number of sulfur in calcium sulfate,CaSO4,is ________.

Accepted Answer

A) +6 
B) +4 
C) +2 
D) 0 
E) -2 
A) +6 
B) +4 
C) +2 
D) 0 
E) -2

Question 10

Fe(s)+ CuCl2 (aq)→ Cu(s)+ FeCl2 (aq)In the redox reaction shown,________ is oxidized and becomes ________.

Accepted Answer

A) Fe; Fe+ 
B) Fe; Fe2+ 
C) Cu; Cu2+ 
D) Cu2+; Cu 
E) none of the above 
A) Fe; Fe+ 
B) Fe; Fe2+ 
C) Cu; Cu2+ 
D) Cu2+; Cu 
E) none of the above

Question 11

When the following reaction is balanced the coefficient in front of oxygen is:
____ C8H18 + ____ O2 → ____ CO2 + ____ H2O

Accepted Answer

A) 25 
B) 12 
C) 18 
D) 9 
A) 25 
B) 12 
C) 18 
D) 9

Question 12

In the correctly balanced reaction the coefficient for the H2O is:
____ Al(OH)3 + ____ H2SO4 → ____ Al2 (SO4)3 + ____ H2O

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 6 
E) 8 
A) 1 
B) 2 
C) 3 
D) 6 
E) 8

Question 13

When a solution of iron(III)nitrate is mixed with a solution of sodium hydroxide,a rust colored precipitate forms.This precipitate is probably

Accepted Answer

A) iron (III)nitrate. 
B) sodium hydroxide. 
C) sodium nitrate. 
D) iron (III)hydroxide. 
E) none of the above 
A) iron (III)nitrate. 
B) sodium hydroxide. 
C) sodium nitrate. 
D) iron (III)hydroxide. 
E) none of the above

Question 14

The reaction 2 AgNO3 (aq)+ K2SO4 (aq)→ 2 KNO3 (aq)+ Ag2SO4 (s)is an example of a(an)________ reaction.

Accepted Answer

A) acid-base 
B) oxidation-reduction 
C) precipitation 
D) combustion 
E) none of the above 
A) acid-base 
B) oxidation-reduction 
C) precipitation 
D) combustion 
E) none of the above

Question 15

Consider the balanced equation shown and identify the statement that is not true.
Na2SO4 (aq)+ BaCl2 (aq)→ 2 NaCl (aq)+ BaSO4 (s)

Accepted Answer

A) The coefficient of sodium sulfate is one. 
B) Barium sulfate is produced in solid form. 
C) Barium chloride is dissolved in water. 
D) The products are barium sulfate and sodium chloride. 
E) 2 NaCl (aq)could also be correctly written as Na2Cl2 (aq). 
A) The coefficient of sodium sulfate is one. 
B) Barium sulfate is produced in solid form. 
C) Barium chloride is dissolved in water. 
D) The products are barium sulfate and sodium chloride. 
E) 2 NaCl (aq)could also be correctly written as Na2Cl2 (aq).

Question 16

Which reaction is an example of an acid-base reaction?

Accepted Answer

A) H2CO3 (aq)→ H2O(l)+ CO2 (g) 
B) H2SO4 (aq)+ Ca(OH)2 (aq)→ CaSO4 (aq)+ 2 H2O(l) 
C) 6 HCl(aq)+ 2 Al(s)→ 2 AlCl3 (aq)+ 3 H2 (g) 
D) FeCl3 (aq)+ 3 KOH(aq)→ Fe(OH)3 (s)+ 3 KCl(aq) 
E) 2 Hg(l)+ O2(g)→2 HgO(s) 
A) H2CO3 (aq)→ H2O(l)+ CO2 (g) 
B) H2SO4 (aq)+ Ca(OH)2 (aq)→ CaSO4 (aq)+ 2 H2O(l) 
C) 6 HCl(aq)+ 2 Al(s)→ 2 AlCl3 (aq)+ 3 H2 (g) 
D) FeCl3 (aq)+ 3 KOH(aq)→ Fe(OH)3 (s)+ 3 KCl(aq) 
E) 2 Hg(l)+ O2(g)→2 HgO(s)

Question 17

The element chlorine is very reactive as a(an)________ agent because it readily ________ electrons to form the chloride ion.

Accepted Answer

A) oxidizing; loses 
B) oxidizing; gains 
C) reducing; loses 
D) reducing; gains 
E) none of the above 
A) oxidizing; loses 
B) oxidizing; gains 
C) reducing; loses 
D) reducing; gains 
E) none of the above

Question 18

In the reaction shown,________ is the oxidizing agent because it ________.
Ni (s)+ CuCl2 (aq)→ Cu (s)+ NiCl2 (aq)

Accepted Answer

A) Ni; causes reduction 
B) Ni; gets reduced 
C) CuCl2; causes reduction 
D) CuCl2; gets reduced 
E) NiCl2; gets reduced 
A) Ni; causes reduction 
B) Ni; gets reduced 
C) CuCl2; causes reduction 
D) CuCl2; gets reduced 
E) NiCl2; gets reduced

Question 19

2 AgNO3 (aq)+ K2SO4 (aq)→ 2 KNO3 (aq)+ Ag2SO4 (s)
The spectator ions in the reaction shown are

Accepted Answer

A) silver ion and nitrate ion. 
B) potassium ion and sulfate ion. 
C) potassium ion and nitrate ion. 
D) silver ion and sulfate ion. 
E) hydrogen ion and hydroxide ion. 
A) silver ion and nitrate ion. 
B) potassium ion and sulfate ion. 
C) potassium ion and nitrate ion. 
D) silver ion and sulfate ion. 
E) hydrogen ion and hydroxide ion.

Question 20

All of the reactions shown are oxidation-reduction reactions except

Accepted Answer

A) N2 (g)+ O2(g)→ 2 NO(g). 
B) 2 Fe2O3 (s)→ 4 Fe(s)+ 3 O2(g). 
C) Zn(s)+ 2 HCl(aq)→ ZnCl2 (aq)+ H2 (g). 
D) 2 NaI(aq)+ Cl2 (g)→ 2 NaCl(aq)+ I2. 
E) K2SO4 (aq)+ BaCl2 (aq)→ BaSO4 (s)+ 2 KCl(aq). 
A) N2 (g)+ O2(g)→ 2 NO(g). 
B) 2 Fe2O3 (s)→ 4 Fe(s)+ 3 O2(g). 
C) Zn(s)+ 2 HCl(aq)→ ZnCl2 (aq)+ H2 (g). 
D) 2 NaI(aq)+ Cl2 (g)→ 2 NaCl(aq)+ I2. 
E) K2SO4 (aq)+ BaCl2 (aq)→ BaSO4 (s)+ 2 KCl(aq).

Exam 5: Classification and Balancing of Chemical Reactions

As a pure element the oxidation number of zinc is ________,but in compounds such as ZnCO3 its oxidation number is ________.

The balanced equation for the reaction occurring when calcium nitrate solution is mixed with sodium phosphate solution is

Which of the following equations is not balanced?

The oxidation number of chlorine in the compound FeCl3 is ________.

Which is the correct equation for the reaction of magnesium with hydrochloric acid to produce hydrogen and magnesium chloride?

When the reaction shown is balanced,there are ________ atoms of oxygen and ________ atoms of hydrogen on each side. (NH4)2SO4 (aq)+ Ba(C2H3O2)2 (aq)→ BaSO4 (s)+ NH4C2H3O2 (aq)

Which one of the following substances is produced during an acid/base (or neutralization)reaction?

Which of the following is not soluble in water?

The oxidation number of sulfur in calcium sulfate,CaSO4,is ________.

Fe(s)+ CuCl2 (aq)→ Cu(s)+ FeCl2 (aq)In the redox reaction shown,________ is oxidized and becomes ________.

When the following reaction is balanced the coefficient in front of oxygen is: ____ C8H18 + ____ O2 → ____ CO2 + ____ H2O

In the correctly balanced reaction the coefficient for the H2O is: ____ Al(OH)3 + ____ H2SO4 → ____ Al2 (SO4)3 + ____ H2O

When a solution of iron(III)nitrate is mixed with a solution of sodium hydroxide,a rust colored precipitate forms.This precipitate is probably

The reaction 2 AgNO3 (aq)+ K2SO4 (aq)→ 2 KNO3 (aq)+ Ag2SO4 (s)is an example of a(an)________ reaction.

Consider the balanced equation shown and identify the statement that is not true. Na2SO4 (aq)+ BaCl2 (aq)→ 2 NaCl (aq)+ BaSO4 (s)

Which reaction is an example of an acid-base reaction?

The element chlorine is very reactive as a(an)________ agent because it readily ________ electrons to form the chloride ion.

In the reaction shown,________ is the oxidizing agent because it ________. Ni (s)+ CuCl2 (aq)→ Cu (s)+ NiCl2 (aq)

2 AgNO3 (aq)+ K2SO4 (aq)→ 2 KNO3 (aq)+ Ag2SO4 (s) The spectator ions in the reaction shown are

All of the reactions shown are oxidation-reduction reactions except

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As a pure element the oxidation number of zinc is ,but in compounds such as ZnCO₃ its oxidation number is .

The oxidation number of chlorine in the compound FeCl₃ is ________.

When the reaction shown is balanced,there are atoms of oxygen and atoms of hydrogen on each side. (NH₄)₂SO₄ (aq)+ Ba(C₂H₃O₂)₂ (aq)→ BaSO₄ (s)+ NH₄C₂H₃O₂ (aq)

The oxidation number of sulfur in calcium sulfate,CaSO₄,is ________.

Fe(s)+ CuCl₂ (aq)→ Cu(s)+ FeCl₂ (aq)In the redox reaction shown, is oxidized and becomes .

When the following reaction is balanced the coefficient in front of oxygen is: C₈H₁₈ + O₂ → CO₂ + H₂O

In the correctly balanced reaction the coefficient for the H₂O is: Al(OH)₃ + H₂SO₄ → Al₂ (SO₄)₃ + H₂O

The reaction 2 AgNO₃ (aq)+ K₂SO₄ (aq)→ 2 KNO₃ (aq)+ Ag₂SO₄ (s)is an example of a(an)________ reaction.

Consider the balanced equation shown and identify the statement that is not true. Na₂SO₄ (aq)+ BaCl₂ (aq)→ 2 NaCl (aq)+ BaSO₄ (s)

The element chlorine is very reactive as a(an) agent because it readily electrons to form the chloride ion.

In the reaction shown, is the oxidizing agent because it . Ni (s)+ CuCl₂ (aq)→ Cu (s)+ NiCl₂ (aq)

2 AgNO₃ (aq)+ K₂SO₄ (aq)→ 2 KNO₃ (aq)+ Ag₂SO₄ (s) The spectator ions in the reaction shown are