Question 1

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?

Accepted Answer

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

Question 2

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

Accepted Answer

A)   -1
B)   +4
C)   +5
D)   +7
E)   None of the above is the correct oxidation number.F) D) and E)
G) All of the above

Question 3

Hydrochloric acid is widely used as a laboratory reagent in refining ore for the production of tin and tantalum, and as a catalyst in organic reactions. Calculate the number of moles of HCl in 62.85 mL of 0.453 M hydrochloric acid.

Accepted Answer

A)   28.5 mol
B)   1.04 mol
C)   0.139 mol
D)   0.0285 mol
E)   0.00721 molF) B) and D)
G) B) and E)

Question 4

Which one of the following ionic compounds is soluble in water?

Accepted Answer

A)   Na2S
B)   PbI2
C)   AgCl
D)   CuS
E)   Ca3(PO4) 2F) B) and D)
G) C) and D)

Question 5

Copper(II)  sulfide, CuS, is used in the development of aniline black dye in textile printing. What is the maximum mass of CuS which can be formed when 38.0 mL of 0.500 M CuCl2 are mixed with 42.0 mL of 0.600 M (NH4) 2S? Aqueous ammonium chloride is the other product.

Accepted Answer

A)   2.41 g
B)   1.82 g
C)   1.21 g
D)   0.909 g
E)   0.044 gF) All of the above
G) None of the above

Question 6

Calculate the molarity of a 23.55-mL solution which contains 28.24 mg of sodium sulfate (used in dyeing and printing textiles,  = 139.04 g/mol) .

Accepted Answer

A)   8.625 M
B)   1.199 M
C)   0.8339 M
D)   0.2031 M
E)   0.008625 MF) A) and E)
G) A) and D)

Question 7

Covalent compounds, dissolved in water, never produce conducting solutions.

Accepted Answer

A) True 
 B)False

Question 8

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

Accepted Answer

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

Question 9

In a redox reaction, electrons are transferred

Accepted Answer

A)   from the substance being oxidized to the reducing agent.
B)   from the oxidizing agent to the reducing agent.
C)   from the substance being reduced to the oxidizing agent.
D)   from the substance being oxidized to the substance being reduced.
E)   from the substance being reduced to the substance being oxidized.F) C) and E)
G) B) and C)

Question 10

Oxidation is associated with an increase in oxidation number.

Accepted Answer

A) True 
 B)False

Question 11

Chemical reactions generally reach equilibrium because one of the reactants is used up.

Accepted Answer

A) True 
 B)False

Question 12

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

Accepted Answer

A)   precipitation
B)   acid-base
C)   redox
D)   decomposition
E)   none of the aboveF) C) and D)
G) A) and B)

Question 13

Which of the following is a strong base?

Accepted Answer

A)   NH3
B)   Ca(OH) 2
C)   Al(OH) 3
D)   B(OH) 3
E)   CH3OHF) All of the above
G) A) and B)

Question 14

Aqueous potassium iodate (KIO3)  and potassium iodide (KI)  react in the presence of dilute hydrochloric acid (HCl) , as shown below. 
KIO3(aq)  + 5KI(aq)  + 6HCl(aq)   3I2(aq)  + 6KCl(aq)  + 3H2O(l) 
What mass of iodine (I2)  is formed when 15.0 mL of 0.0050 M KIO3 solution reacts with 30.0 mL of 0.010 M KI solution in the presence of excess HCl?

Accepted Answer

A)   0.023 g I2
B)   0.029 g I2
C)   0.057 g I2
D)   0.046 g I2
E)   0.076 g I2F) A) and B)
G) A) and C)

Question 15

Calcium chloride is used to melt ice and snow on roads and sidewalks and to remove water from organic liquids. Calculate the molarity of a solution prepared by diluting 165 mL of 0.688 M calcium chloride to 925.0 mL.

Accepted Answer

A)   3.86 M
B)   0.743 M
C)   0.222 M
D)   0.123 M
E)   0.114 MF) A) and D)
G) A) and E)

Question 16

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) F1F1F1S1F1F1F10 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.

Accepted Answer

Question 17

Aqueous potassium iodate (KIO3)  and potassium iodide (KI)  react in the presence of dilute hydrochloric acid, as shown below.
 KIO3(aq)  + 5KI(aq)  + 6HCl(aq)   3I2(aq)  + 6KCl(aq)  + 3H2O(l) 
What mass of iodine (I2)  is formed when 50.0 mL of 0.020 M KIO3 solution reacts with an excess of KI and HCl?

Accepted Answer

A)   0.13 g I2
B)   0.25 g I2
C)   0.38 g I2
D)   0.76 g I2
E)   none of the aboveF) A) and C)
G) B) and D)

Question 18

A combination reaction may also be a displacement reaction.

Accepted Answer

A) True 
 B)False

Question 19

Which one of the following is not a redox reaction?

Accepted Answer

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

Question 20

How many mL of concentrated nitric acid (HNO3, 16.0 M)  should be diluted with water in order to make 2.00 L of 2.00 M solution?

Accepted Answer

A)   32.0 mL
B)   62.5 mL
C)   125 mL
D)   250. mL
E)   500. mLF) A) and D)
G) C) and D)

Exam 4: The Major Classes of Chemical Reactions

Hydrochloric acid is widely used as a laboratory reagent in refining ore for the production of tin and tantalum, and as a catalyst in organic reactions. Calculate the number of moles of HCl in 62.85 mL of 0.453 M hydrochloric acid.

Correct Answer
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A combination reaction may also be a displacement reaction.

Correct Answer
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In a redox reaction, electrons are transferred

Correct Answer
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Covalent compounds, dissolved in water, never produce conducting solutions.

Correct Answer
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Oxidation is associated with an increase in oxidation number.

Correct Answer
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Correct Answer
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Correct Answer
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Calculate the molarity of a 23.55-mL solution which contains 28.24 mg of sodium sulfate (used in dyeing and printing textiles, = 139.04 g/mol) .

Correct Answer
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Correct Answer
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Chemical reactions generally reach equilibrium because one of the reactants is used up.

Correct Answer
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Which one of the following is not a redox reaction?

Correct Answer
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Which of the following is a strong base?

Correct Answer
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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?

Correct Answer
verified

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

Correct Answer
verified

Calcium chloride is used to melt ice and snow on roads and sidewalks and to remove water from organic liquids. Calculate the molarity of a solution prepared by diluting 165 mL of 0.688 M calcium chloride to 925.0 mL.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
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Which one of the following ionic compounds is soluble in water?

Correct Answer
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Copper(II) sulfide, CuS, is used in the development of aniline black dye in textile printing. What is the maximum mass of CuS which can be formed when 38.0 mL of 0.500 M CuCl2 are mixed with 42.0 mL of 0.600 M (NH4) 2S? Aqueous ammonium chloride is the other product.

Correct Answer
verified

How many mL of concentrated nitric acid (HNO₃, 16.0 M) should be diluted with water in order to make 2.00 L of 2.00 M solution?

Correct Answer
verified

Exam 4: The Major Classes of Chemical Reactions

Hydrochloric acid is widely used as a laboratory reagent in refining ore for the production of tin and tantalum, and as a catalyst in organic reactions. Calculate the number of moles of HCl in 62.85 mL of 0.453 M hydrochloric acid.

Correct AnswerverifiedShow Answer

A combination reaction may also be a displacement reaction.

Correct AnswerverifiedShow Answer

In a redox reaction, electrons are transferred

Correct AnswerverifiedShow Answer

Covalent compounds, dissolved in water, never produce conducting solutions.

Correct AnswerverifiedShow Answer

Oxidation is associated with an increase in oxidation number.

Correct AnswerverifiedShow Answer

Aqueous potassium iodate (KIO3) and potassium iodide (KI) react in the presence of dilute hydrochloric acid, as shown below. KIO3(aq) + 5KI(aq) + 6HCl(aq)  3I2(aq) + 6KCl(aq) + 3H2O(l) What mass of iodine (I2) is formed when 50.0 mL of 0.020 M KIO3 solution reacts with an excess of KI and HCl?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Calculate the molarity of a 23.55-mL solution which contains 28.24 mg of sodium sulfate (used in dyeing and printing textiles, = 139.04 g/mol) .

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Chemical reactions generally reach equilibrium because one of the reactants is used up.

Correct AnswerverifiedShow Answer

Which one of the following is not a redox reaction?

Correct AnswerverifiedShow Answer

Which of the following is a strong base?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Calcium chloride is used to melt ice and snow on roads and sidewalks and to remove water from organic liquids. Calculate the molarity of a solution prepared by diluting 165 mL of 0.688 M calcium chloride to 925.0 mL.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which one of the following ionic compounds is soluble in water?

Correct AnswerverifiedShow Answer

Copper(II) sulfide, CuS, is used in the development of aniline black dye in textile printing. What is the maximum mass of CuS which can be formed when 38.0 mL of 0.500 M CuCl2 are mixed with 42.0 mL of 0.600 M (NH4) 2S? Aqueous ammonium chloride is the other product.

Correct AnswerverifiedShow Answer

How many mL of concentrated nitric acid (HNO3, 16.0 M) should be diluted with water in order to make 2.00 L of 2.00 M solution?

Correct AnswerverifiedShow Answer

Correct Answer
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Select the classification for the following reaction. Fe(s) + 2Fe³⁺(aq)  3Fe²⁺(aq)

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

Correct Answer
verified

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

Correct Answer
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Correct Answer
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Correct Answer
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How many mL of concentrated nitric acid (HNO₃, 16.0 M) should be diluted with water in order to make 2.00 L of 2.00 M solution?

Correct Answer
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