Deck 4: Three Major Classes of Chemical Reactions

Question 1

Select the precipitate that forms when the following reactants are mixed.
Na₂CO₃(aq)+ BaCl₂(aq) $\to$

A)Ba₂CO₃
B)BaCO₃
C)NaCl
D)NaCl₂
E)BaO

Answer 1

BaCO₃

Question 2

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed.
CuCl₂(aq)+ Na₂CO₃(aq) $\to$

A)copper(I)carbonate,Cu₂CO₃
B)copper(II)carbonate,Cu₂CO₃
C)copper(I)carbonate,CuCO₃
D)copper(II)carbonate,CuCO₃
E)sodium chloride,NaCl

Answer 2

copper(II)carbonate,CuCO₃

Question 3

Potassium carbonate,K₂CO₃,sodium iodide,NaI,magnesium chloride,MgCl₂,methanol,CH₃OH,and ammonium chloride,NH₄Cl,are soluble in water.Which produces the largest number of dissolved particles per mole of dissolved solute?

A)K₂CO₃
B)NaI
C)MgCl₂
D)CH₃OH
E)NH₄Cl

Answer 3

K₂CO₃

Question 4

How many moles of H⁺(aq)ions are present in 750 mL of 0.65 M hydrochloric acid?

A)1.2 mol
B)0.98 mol
C)0.87 mol
D)0.65 mol
E)0.49 mol

Question 5

How many moles of ions are released when 0.27 mol of cobalt(II)chloride,CoCl₂,is dissolved in water?

A)0.81 mol
B)0.54 mol
C)0.27 mol
D)0.18 mol
E)0.090 mol

Question 6

Which of the following is most soluble in water?

A)benzene,C₆H₆
B)potassium nitrate,KNO₃
C)carbon tetrachloride,CCl₄
D)hexane,C₆H₁₄
E)ethane,C₂H₄

Question 7

In the following reaction,what ions,if any,are spectator ions?
Pb(NO₃)₂(aq)+ 2NaCl(aq) $\to$ PbCl₂(s)+ 2NaNO₃(aq)

A)Pb²⁺(aq),Cl^-(aq)
B)Na⁺(aq),NO₃^-(aq)
C)Pb²⁺(aq),NO₃^-(aq)
D)Na⁺(aq),Cl^-(aq)
E)There are no spectator ions.

Question 8

Select the precipitate that forms when aqueous lead(II)nitrate reacts with aqueous sodium sulfate.

A)NaNO₃
B)Na₂NO₃
C)PbSO₄
D)Pb₂SO₄
E)PbS

Question 9

How many moles of H⁺(aq)ions are present in 1.25 L of 0.75 M nitric acid?

A)0.60 mol
B)0.75 mol
C)0.94 mol
D)1.7 mol
E)1.9 mol

Question 10

Potassium chloride,KCl,sodium sulfate,Na₂SO₄,glucose,C₆H₁₂O₆,carbon dioxide,CO₂ and ammonium phosphate, (NH₄)₃PO₄,are soluble in water.Which one produces the largest number of dissolved particles per mole of dissolved solute?

A)KCl
B)Na₂SO₄
C)C₆H₁₂O₆
D)CO₂
E)(NH₄)₃PO₄

Question 11

How many sodium ions are present in 325 mL of 0.850 M Na₂SO₄?

A)1.66 $\times$ 10²³ Na ions
B)3.33 $\times$ 10²³ Na ions
C)4.99 $\times$ 10²³ Na ions
D)6.20 $\times$ 10²³ Na ions
E)1.57 $\times$ 10²⁴ Na ions

Question 12

Which of the following solutions will be the poorest conductor of electrical current?

A)sucrose,C₁₂H₂₂O₁₁(aq)
B)sodium chloride,NaCl(aq)
C)potassium nitrate,KNO₃(aq)
D)lithium hydroxide,LiOH(aq)
E)sulfuric acid,H₂SO₄(aq)

Question 13

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed.
CoSO₄(aq)+ (NH₄)₃PO₄(aq) $\to$

A)cobalt(II)phosphate,Co₃(PO₄)₂
B)cobalt(III)phosphate,Co₃(PO₄)₂
C)cobalt(II)phosphate,CoPO₄
D)cobalt(III)phosphate,CoPO₄
E)ammonium sulfate, (NH₄)₂SO₄

Question 14

Which of the following will be least soluble in water?

A)potassium sulfate,K₂SO₄
B)ammonium nitrate,NH₄NO₃
C)chloromethane,CH₃Cl
D)calcium chloride,CaCl₂
E)ethanol,C₂H₆O

Question 15

Which one of the following substances is the best electrolyte?

A)CO
B)CH₃Cl
C)CH₄
D)C₂H₅OH
E)HCl

Question 16

Select the precipitate that forms when aqueous ammonium sulfide reacts with aqueous copper(II)nitrate.

A)CuS
B)Cu₂S
C)NH₄NO₃
D)NH₄(NO₃)₂
E)CuSO₄

Question 17

Which one of the following substances,when dissolved in water at equal molar concentrations,will give the solution with the lowest electrical conductivity?

A)CaCl₂
B)HNO₃
C)NH₃
D)C₆H₁₂O₆ (glucose)
E)CO₂

Question 18

Which of the following solutions will be the best conductor of electrical current?

A)methyl alcohol,CH₃OH(aq)
B)glucose,C₆H₁₂O₆(aq)
C)potassium chloride,KCl(aq)
D)bromine,Br₂(aq)
E)ethylene glycol,C₂H₆O₂(aq)

Question 19

Select the precipitate that forms when the following reactants are mixed.
Mg(CH₃COO)₂(aq)+ LiOH(aq) $\to$

A)LiCH₃COO
B)Li(CH₃COO)₂
C)MgOH
D)Mg(OH)₂
E)CH₃OH

Question 20

How many moles of ions are released when 1.6 mol of ammonium phosphate, (NH₄)₃PO₄,is dissolved in water?

A)0.40 mol
B)1.6 mol
C)3.2 mol
D)4.8 mol
E)6.4 mol

Question 21

Sodium tripolyphosphate is used in detergents to make them effective in hard water.Calculate the oxidation number of phosphorus in Na₅P₃O₁₀.

A)+3
B)+5
C)+10
D)+15
E)None of these is the correct oxidation number.

Question 22

The oxidation numbers of P,S and Cl in H₂PO₂^-,H₂S and KClO₄ are,respectively

A)-1,-1,+3
B)+1,-2,+7
C)+1,+2,+7
D)-1,-2,+7
E)-1,-2,+3

Question 23

Calculate the oxidation number of the chlorine in perchloric acid,HClO₄,a strong oxidizing agent.

A)-1
B)+4
C)+5
D)+7
E)None of these is the correct oxidation number.

Question 24

A 0.00100 mol sample of Ca(OH)₂ requires 25.00 mL of aqueous HCl for neutralization according to the reaction below.What is the concentration of the HCl?
Equation: Ca(OH)₂(s)+ 2HCl(aq) $\to$ CaCl₂(aq)+ H₂O(l)

A)0.0200 M
B)0.0400 M
C)0.0800 M
D)4.00 $\times$ 10^-5 M
E)None of these choices is correct.

Question 25

Which of the following is a strong acid?

A)H₃PO₄
B)HNO₃
C)HF
D)CH₃COOH
E)H₂O

Question 26

A standard solution of 0.243 M NaOH was used to determine the concentration of a hydrochloric acid solution.If 46.33 mL of NaOH is needed to neutralize 10.00 mL of the acid,what is the molar concentration of the acid?

A)0.0524 M
B)0.888 M
C)1.13 M
D)2.26 M
E)2.43 M

Question 27

Which one of the following is not a redox reaction?

A)2H₂(g)+ O₂(g) $\to$ 2H₂O(l)
B)Zn(s)+ H₂SO₄(aq) $\to$ ZnSO₄(aq)+ H₂(g)
C)H₂O(l)+ NH₃(g) $\to$ NH₄⁺(aq)+ OH^-(aq)
D)6FeSO₄(aq)+ K₂Cr₂O₇(aq)+ 7H₂SO₄(aq) $\to$
Cr₂(SO₄)₃(aq)+ 3Fe₂(SO₄)₃(aq)+ K₂SO₄(aq)+ 7H₂O(l)
E)Cl₂(g)+ 2KBr(aq) $\to$ Br₂(l)+ 2KCl(aq)

Question 28

Select the net ionic equation for the reaction between sodium chloride and mercury(I)nitrate.
2NaCl(aq)+ Hg₂(NO₃)₂(aq) $\to$ NaNO₃(aq)+ Hg₂Cl₂(s)

A)Na⁺(aq)+ NO₃^-(aq) $\to$ NaNO₃(aq)
B)Hg₂²⁺(aq)+ 2Cl^-(aq) $\to$ Hg₂Cl₂(s)
C)NaCl(aq) $\to$ Na⁺(aq)+ Cl^-(aq)
D)Hg₂(NO₃)₂(aq) $\to$ Hg₂²⁺(aq)+ 2NO₃^-(aq)
E)Hg₂²⁺(aq) $\to$ Hg₂(s)

Question 29

Which one of the following substances is a strong acid?

A)HNO₃
B)H₂CO₃
C)NH₃
D)CH₃COOH
E)H₃PO₄

Question 30

Which of the following is a strong base?

A)NH₃
B)Ca(OH)₂
C)Al(OH)₃
D)B(OH)₃
E)CH₃OH

Question 31

Calculate the oxidation number of sulfur in sodium metabisulfite,Na₂S₂O₅.

A)-2
B)+2
C)+4
D)+5
E)None of these is the correct oxidation number.

Question 32

Which of the following is a weak acid?

A)H₂SO₄
B)HNO₃
C)HF
D)HBr
E)HCl

Question 33

Sodium thiosulfate,Na₂S₂O₃,is used as a "fixer" in black and white photography.Identify the reducing agent in the reaction of thiosulfate with iodine.
2S₂O₃^2-(aq)+ I₂(aq) $\to$ S₄O₆^2-(aq)+ 2I^-(aq)

A)I₂(aq)
B)I-(aq)
C)S₂O₃^2-(aq)
D)S₄O₆^2-(aq)
E)S₂O₃^2-(aq)and I^-(aq)

Question 34

Select the net ionic equation for the reaction between lithium hydroxide and hydrobromic acid.
LiOH(aq)+ HBr(aq) $\to$ H₂O(l)+ LiBr(aq)

A)LiOH(aq) $\to$ Li⁺(aq)+ OH^-(aq)
B)HBr(aq) $\to$ H⁺(aq)+ Br^-(aq)
C)H⁺(aq)+ OH^-(aq) $\to$ H₂O(l)
D)Li⁺(aq)+ Br^-(aq) $\to$ LiBr(aq)
E)Li⁺(aq)+ OH^-(aq)+ H⁺(aq)+ Br^-(aq) $\to$ H₂O(l)+ LiBr(aq)

Question 35

Which of the following is a weak base?

A)NH₃
B)Ca(OH)₂
C)Ba(OH)₂
D)NaOH
E)CH₃COOH

Question 36

Automobile batteries use 3.0 M H₂SO₄ as an electrolyte.How much 1.20 M NaOH will be needed to neutralize 225 mL of battery acid?
H₂SO₄(aq)+ 2NaOH(aq) $\to$ 2H₂O(l)+ Na₂SO₄(aq)

A)0.045 L
B)0.28 L
C)0.56 L
D)0.90 L
E)1.1 L

Question 37

Calculate the oxidation number of iodine in I₂.

A)-1
B)0
C)+1
D)+7
E)None of these is the correct oxidation number.

Question 38

Identify the oxidizing agent in the following redox reaction.
Hg²⁺(aq)+ Cu(s) $\to$ Cu²⁺(aq)+ Hg(l)

A)Hg²⁺(aq)
B)Cu(s)
C)Cu²⁺(aq)
D)Hg(l)
E)Hg²⁺(aq)and Cu²⁺(aq)

Question 39

Select the correct set of products for the following reaction.
Ba(OH)₂(aq)+ HNO₃(aq) $\to$

A)BaN₂(s)+ H₂O(l)
B)Ba(NO₃)₂(aq)+ H₂O(l)
C)Ba(s)+ H₂(g)+ NO₂(g)
D)Ba₂O(s)+ NO₂(g)+ H₂O(l)
E)No reaction occurs.

Question 40

Vinegar is a solution of acetic acid,CH₃COOH,dissolved in water.A 5.54-g sample of vinegar was neutralized by 30.10 mL of 0.100 M NaOH.What is the percent by weight of acetic acid in the vinegar?

A)0.184%
B)1.63%
C)3.26%
D)5.43%
E)9.23%

Question 41

Select the classification for the following reaction.
2Na(s)+ 2H₂O(l) $\to$ 2NaOH(aq)+ H₂(g)

A)precipitation
B)acid-base
C)redox
D)combination
E)None of these choices is correct.

Question 42

Select the classification for the following reaction.
H₂(g)+ Cl₂(g) $\to$ 2HCl(g)

A)combination
B)decomposition
C)displacement
D)acid-base
E)None of these choices is correct.

Question 43

Select the classification for the following reaction.
2I^-(aq)+ Cl₂(aq) $\to$ I₂(aq)+ 2Cl^-(aq)

A)combination
B)displacement
C)decomposition
D)precipitation
E)acid-base

Question 44

Which one of the following is not a redox reaction?

A)2Na(s)+ 2H₂O(l) $\to$ 2NaOH(aq)+ H₂(g)
B)H₂(g)+ Cl₂(g) $\to$ 2HCl(g)
C)2H₂O₂(aq) $\to$ 2H₂O(l)+ O₂(g)
D)Fe₂O₃(s)+ 3H₂SO₄(aq) $\to$ Fe₂(SO₄)₃(aq)+ 3H₂O(l)
E)2KMnO₄(aq)+ 10FeSO₄(aq)+ 8H₂SO₄(aq) $\to$
K₂SO₄(aq)+ 2MnSO₄(aq)+ 5Fe₂(SO₄)₃(aq)+ 8H₂O(l)

Question 45

Select the classification for the following reaction.
NH₃(aq)+ HNO₃(aq) $\to$ NH₄NO₃(aq)

A)precipitation
B)acid-base
C)redox
D)decomposition
E)None of these choices is correct.

Question 46

Select the classification for the following reaction.
2H₂O₂(aq) $\to$ 2H₂O(l)+ O₂(g)

A)combination
B)decomposition
C)displacement
D)acid-base
E)None of these choices is correct.

Question 47

Which one of the following is a redox reaction?

A)2Na(g)+ Cl₂(g) $\to$ 2NaCl(s)
B)Ba²⁺(aq)+ SO₄^2-(aq) $\to$ BaSO₄(s)
C)K₂Cr₂O₇(aq)+ 2KOH(aq) $\to$ 2K₂CrO₄(aq)+ H₂O(l)
D)Na₂CO₃(s)+ 2HCl(aq) $\to$ 2NaCl(aq)+ CO₂(g)+ H₂O(l)
E)H₂O(l) $\to$ H⁺(aq)+ OH^-(aq)

Question 48

Select the classification for the following reaction.
KOH(aq)+ HCl(aq) $\to$ KCl(aq)+ H₂O(l)

A)precipitation
B)acid-base
C)redox
D)combination
E)None of these choices is correct.

Question 49

Predict the product(s)for the following reaction.
Cl₂O₇(g)+ H₂O(l) $\to$

A)HClO₄(aq)
B)H₂ClO₄(aq)
C)H(ClO₄)₂ (aq)
D)HCl(aq)+ O₂(g)
E)HclO₃(aq)

Question 50

Select the classification for the following reaction.
Na₂O(s)+ H₂O(l) $\to$ 2NaOH(aq)

A)combination
B)decomposition
C)displacement
D)acid-base
E)precipitation

Question 51

Select the classification for the following reaction.
Fe²⁺(aq)+ 2OH^-(aq) $\to$ Fe(OH)₂(s)

A)precipitation
B)acid-base
C)redox
D)decomposition
E)None of these choices is correct.

Question 52

Select the classification for the following reaction.
BaCl₂(aq)+ K₂SO₄(aq) $\to$ BaSO₄(s)+ 2KCl(aq)

A)precipitation
B)acid-base
C)redox
D)decomposition
E)None of these choices is correct.

Question 53

Identify all the spectator ions in the following reaction.
2KMnO₄(aq)+ 10FeSO₄(aq)+ 8H₂SO₄(aq) $\to$ K₂SO₄(aq)+ 2MnSO₄(aq)+ 5Fe₂(SO₄)₃(aq)+ 8H₂O(l)

A)only K⁺
B)only SO₄^2-
C)only K⁺ and SO₄^2-
D)only K⁺,SO₄^2- and Fe²⁺
E)only K⁺,SO₄^2-,Fe²⁺ and Mn²⁺

Question 54

Which one of the following is not a redox reaction?

A)2H₂O₂(aq) $\to$ 2H₂O(l)+ O₂(g)
B)N₂(g)+ 3H₂(g) $\to$ 2NH₃(g)
C)BaCl₂(aq)+ K₂CrO₄(aq) $\to$ BaCrO₄(aq)+ 2KCl(aq)
D)2Al(s)+ Fe₂O₃(s) $\to$ Al₂O₃(s)+ 2Fe(s)
E)2H₂O(g) $\to$ 2H₂(g)+ O₂(g)

Question 55

Select the classification for the following reaction.
Fe(s)+ 2Fe³⁺(aq) $\to$ 3Fe²⁺(aq)

A)precipitation
B)acid-base
C)redox
D)decomposition
E)None of these choices is correct.

Question 56

Select the classification for the following reaction.
CaCl₂·H₂O(s)
CaCl₂(s)+ H₂O(g)

A)combination
B)decomposition
C)displacement
D)acid-base
E)precipitation

Question 57

Select the classification for the following reaction.
H₂CO₃(aq) $\to$ H₂O(l)+ CO₂(g)

A)combination
B)decomposition
C)displacement
D)acid-base
E)None of these choices is correct.

Question 58

The compound P₄O₁₀ is used in refining sugar.Select the classification for the reaction in which it is synthesized.
P₄(s)+ 5O₂(g) $\to$ P₄O₁₀(s)

A)combination
B)decomposition
C)displacement
D)acid-base
E)precipitation

Question 59

Select the classification for the following reaction.
2Ag⁺(aq)+ Zn(s) $\to$ 2Ag(s)+ Zn²⁺(aq)

A)displacement
B)decomposition
C)combination
D)precipitation
E)acid-base

Question 60

Select the classification for the following reaction.
2NaCl(l)
2Na(l)+ Cl₂(g)

A)acid-base
B)precipitation
C)combination
D)displacement
E)decomposition

Question 61

In both of the following reactions,a precipitate is formed.Complete and balance the equations,showing the phases of the products.
a.BaCl₂(aq)+ Na₂SO₄(aq) $\to$
b.Mg(NO₃)₂(aq)+ KOH(aq) $\to$

Question 62

Predict the product(s)for the following reaction.
H₂SO₄(aq)+ KOH(aq) $\to$

A)K₂SO₄(aq)+ H₂O(l)
B)K₂S(aq)+ H₂O(l)
C)K(s)+ H₂(g)+ SO₃(g)
D)KSO₄(aq)+ H₂O(l)
E)No reaction occurs.

Question 63

Predict the product(s)for the following reaction.
BaO(s)+ CO₂(g) $\to$

A)Ba(s)+ CO₃(g)
B)BaCO₃(s)
C)BaO(s)+ C(s)
D)Ba(s)+ CO₃^2-(s)
E)No reaction occurs.

Question 64

Sulfuric acid (H₂SO₄)reacts with potassium hydroxide (KOH)as follows.
H₂SO₄(aq)+ 2KOH(aq) $\to$ K₂SO₄(aq)+ 2H₂O(l)
Calculate the volume of 0.100 M sulfuric acid required to neutralize 25.0 mL of 0.0821 M KOH.Show all your work.

Question 65

A 0.1873 g sample of a pure,solid acid,H₂X was dissolved in water and titrated with 0.1052 M NaOH solution.The balanced equation for the neutralization reaction occurring is
H₂X(aq)+ 2NaOH(aq) $\to$ Na₂X(aq)+ 2H₂O(l)
If the molar mass of H₂X is 85.00 g/mol,calculate the volume of NaOH solution needed in the titration.

Question 66

A particular reaction may be both a precipitation and an acid-base (neutralization)reaction.

Question 67

For each of the following species,write down,next to the formula,the oxidation number of the indicated atom.
a.P in H₂PO₂^-
b.S in Na₂S₂O₃
c.C in CH₂O

Question 68

Some covalent compounds dissolve in water to produce conducting solutions.

Question 69

a.You are provided with a 250 mL volumetric flask,deionized water and solid NaOH.How much NaOH should be weighed out in order to make 250.mL of 0.100 M solution?
b.25.0 mL of the 0.100 M aqueous NaOH is titrated against sulfuric acid,H₂SO₄,according to the equation
2NaOH(aq)+ H₂SO₄(aq) $\to$ Na₂SO₄(aq)+ 2H₂O(l)
If the volume of sulfuric acid solution required to neutralize the NaOH is 18.62 mL,what is its concentration?

Question 70

In both of the following reactions,a precipitate is formed.Complete and balance the equations,showing the phases of the products.
a.AgNO₃(aq)+ CaCl₂(aq) $\to$
b.NaOH(aq)+ Fe(NO₃)₃(aq) $\to$

Question 71

In a redox reaction,the reducing agent undergoes loss of electrons.

Question 72

a.Explain or define what is meant by the term "oxidation".
b.Write down the oxidation numbers of the atoms in the following formulas.

Question 73

a.Define "oxidation".
b.Identify the oxidizing and reducing agents in the following (unbalanced)equation.
HNO₃(aq)+ C₂H₆O(aq)+ K₂Cr₂O₇(aq) $\to$ KNO₃(aq)+ C₂H₄O(aq)+ H₂O(l)+ Cr(NO₃)₃(aq)

Question 74

An aqueous solution of lead nitrate,Pb(NO₃)₂,is mixed with one of sodium chromate,Na₂CrO₄,resulting in the formation of a precipitate of lead chromate.Write a balanced net ionic equation for this precipitation reaction,showing all phases.

Question 75

In an acid-base (neutralization)reaction the indicator will change color at the end point.

Question 76

Complete and balance the equation for the following acid-base reaction.
Ca(OH)₂(aq)+ HCl(aq) $\to$

Question 77

Write down the oxidation number of the indicated atom in each of the following formulas:
a.Si in SiO₂
b.Cl in ClO₂^-
c.Mn in KMnO₄
d.C in C₆H₁₂O₆

Question 78

In an acid-base (neutralization)reaction the equivalence point is the point where the indicator changes color.

Question 79

In each of the following cases,write down the oxidation number of the indicated atom.
a.P in P₄
b.C in C₂H₆
c.S in H₂SO₄
d.Mn in MnO₄^-
e.S in S₄O₆^2-
f.P in Na₃PO₄

Question 80

Predict the products by completing a balanced equation for the following decomposition reaction.
CaCl₂(l)
?

A)CaCl₂(l)

Ca(l)+ 2Cl^-(l)
B)CaCl₂(l)

Ca²⁺(l)+ Cl₂(g)
C)CaCl₂(l)

Ca²⁺(l)+ 2Cl^-(l)
D)CaCl₂(l)

Ca(l)+ Cl₂(g)
E)CaCl₂(l)

CaCl(l)+ Cl^-(l)