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) F1F1F1S1F1F1F10 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?

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

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

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) F1F1F1S1F1F1F10 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?

A) 0.13 g I2 B) 0.25 g I2 C) 0.38 g I2 D) 0.76 g I2 E) none of the above A) 0.13 g I2 B) 0.25 g I2 C) 0.38 g I2 D) 0.76 g I2 E) none of the above

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?

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

Select the classification for the following reaction. Fe(s) + 2Fe3+(aq) F1F1F1S1F1F1F10 3Fe2+(aq)

A) precipitation B) acid-base C) redox D) decomposition E) none of the above A) precipitation B) acid-base C) redox D) decomposition E) none of the above

Exam 4: The Major Classes of Chemical Reactions

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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?

(Multiple Choice)

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Question 81

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).

(Multiple Choice)

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Question 82

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

(Multiple Choice)

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Question 83

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)  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.

(Short Answer)

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Question 84

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.

(Multiple Choice)

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Question 85

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

(Multiple Choice)

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Question 86

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?

(Multiple Choice)

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Question 87

Which one of the following is not a redox reaction?

(Multiple Choice)

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Question 88

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?

(Multiple Choice)

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Question 89

Oxidation is associated with an increase in oxidation number.

(True/False)

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Question 90

A combination reaction may also be a displacement reaction.

(True/False)

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Question 91

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

(Multiple Choice)

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Question 92

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

(Multiple Choice)

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Question 93

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

(True/False)

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Question 94

In a redox reaction, electrons are transferred

(Multiple Choice)

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Question 95

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.

(Multiple Choice)

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Question 96

Which of the following is a strong base?

(Multiple Choice)

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Question 97

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.

(Multiple Choice)

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Question 98

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

(True/False)

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Question 99

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?

(Multiple Choice)

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Question 100

Showing 81 - 100 of 124

Exam 4: The Major Classes of Chemical Reactions

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).

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

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.

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

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?

Which one of the following is not a redox reaction?

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?

Oxidation is associated with an increase in oxidation number.

A combination reaction may also be a displacement reaction.

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

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

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

In a redox reaction, electrons are transferred

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.

Which of the following is a strong base?

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.

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

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?

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main Group Elements: Bonding, Structure, and Reactivity

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

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

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

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?

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