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Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

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Chapter
Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 3.8, Problem 2CYU
Textbook Problem
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The following reaction is used in a device for testing the breath of a person for the presence of ethanol. Identify the oxidizing and reducing agents, the substance oxidized, and the substance reduced.

3 Chapter 3.8, Problem 2CYU, The following reaction is used in a device for testing the breath of a person for the presence of

Interpretation Introduction

Interpretation:

Oxidizing and reducing agents, the substance oxidized and the substance reduced in the given chemical reaction should be identified.

Concept introduction:

An oxidizing agent gains the electrons and is reduced in a chemical reaction and it is electron acceptor.  A reducing agent loses electrons and is oxidized in a chemical reaction and it is electron donor.  The oxidation state is called as oxidation number, which describes degree of oxidation (loss of electrons) of an atom in a chemical compound.  Theoretically, the oxidation state is positive, negative or zero.

Explanation of Solution

The given reaction is shown below,

The given compound is Cr2O72- and which is not a neutral compound.  Therefore the overall charge is -2.

The oxidation number of oxygen is -2, therefore the oxidation state of  Cr in Cr2O72- is given below,

Net charge on Cr2O72- is equal to sum of the oxidation number of seven oxygen atoms.

Therefore,

Net charge = Number of oxidation state of oxygen atom -2 = (2x)x

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Chapter 3 Solutions

Chemistry & Chemical Reactivity
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Ch. 3.5 - In each of the following cases, aqueous solutions...Ch. 3.5 - Aqueous solutions of the two reactants listed...Ch. 3.5 - What is the net ionic equation for the reaction of...Ch. 3.6 - (a) Write a balanced equation for the reaction...Ch. 3.6 - Write the balanced, overall equation and the net...Ch. 3.6 - Which of the following is a strong add in aqueous...Ch. 3.6 - 2. The hydrogen phosphate ion is amphiprotic....Ch. 3.6 - What is the net ionic equation for the reaction of...Ch. 3.6 - Identify the basic oxide from those listed below....Ch. 3.7 - Barium carbonate, BaC0)3, is used in the brick,...Ch. 3.7 - Which of the following compounds, when treated...Ch. 3.8 - Assign an oxidation number to the underlined atom...Ch. 3.8 - The following reaction is used in a device for...Ch. 3.8 - 1. What is the oxidation number of Mn in...Ch. 3.8 - 2. Which of the following reactions are...Ch. 3.8 - 3. In which of the manganese compounds below does...Ch. 3.9 - Classify each of the following reactions as a...Ch. 3.9 - 1. Sometimes a reaction can fall in more than one...Ch. 3.9 - Use the following mass percentages to determine...Ch. 3.9 - What is the percent by mass of each element in...Ch. 3.9 - Assuming the charges on the yttrium and barium...Ch. 3.9 - The reaction of Y2O3, BaCO3, and CuO produces...Ch. 3.9 - The percentage of oxygen in YBCO is adjusted by...Ch. 3 - Write balanced chemical equations for the...Ch. 3 - Write balanced chemical equations for the...Ch. 3 - Balance the following equations: (a) Cr(s) + O2(g)...Ch. 3 - Balance the following equations: (a) Cr(s) +...Ch. 3 - Balance the following equations, and name each...Ch. 3 - Balance the following equations, and name each...Ch. 3 - Equal amounts of two acidsHCl and HCO2H (formic...Ch. 3 - Two aqueous solutions were prepared, one...Ch. 3 - What is an electrolyte? How can you differentiate...Ch. 3 - Name and give the formulas of two acids that are...Ch. 3 - Which compound or compounds in each of the...Ch. 3 - Which compound or compounds in each of the...Ch. 3 - The following compounds are water-soluble. What...Ch. 3 - The following compounds are water-soluble. What...Ch. 3 - Decide whether each of the following is...Ch. 3 - Decide whether each of the following is...Ch. 3 - Balance the equation for the following...Ch. 3 - Balance the equation for the following...Ch. 3 - Predict the products of each precipitation...Ch. 3 - Predict the products of each precipitation...Ch. 3 - Write a balanced equation for the ionization of...Ch. 3 - Write a balanced equation for the ionization of...Ch. 3 - Oxalic acid, H2C2O4, which is found in certain...Ch. 3 - Phosphoric add can supply one, two, or three H3O+...Ch. 3 - Write a balanced equation for reaction of the...Ch. 3 - Write a balanced equation for the reaction of...Ch. 3 - Complete and balance the equations for the...Ch. 3 - Complete and balance the equations for the...Ch. 3 - Write a balanced equation for the reaction of...Ch. 3 - Write a balanced equation for the reaction of...Ch. 3 - Write an equation that describes the equilibrium...Ch. 3 - Write an equation that describes the equilibrium...Ch. 3 - Write two chemical equations, one that shows H2O...Ch. 3 - Write two chemical equations, one in which H2PO4...Ch. 3 - Balance the following equations, and then write...Ch. 3 - Balance the following equations, and then write...Ch. 3 - Balance the following equations, and then write...Ch. 3 - Balance each of the following equations, and then...Ch. 3 - Write balanced net ionic equations for the...Ch. 3 - Write balanced net ionic equations for the...Ch. 3 - Siderite is a mineral consisting largely of...Ch. 3 - The mineral rhodothrosite is manganese()...Ch. 3 - Write an overall, balanced equation for the...Ch. 3 - Write an overall, balanced equation for the...Ch. 3 - Determine the oxidation number of each element in...Ch. 3 - Determine the oxidation number of each element in...Ch. 3 - Which two of the following reactions are...Ch. 3 - Which two of the following reactions are...Ch. 3 - In the following reactions, decide which reactant...Ch. 3 - In the following reactions, decide which reactant...Ch. 3 - Balance the following equations, and then classify...Ch. 3 - Balance the following equations, and then dassify...Ch. 3 - Classify each of the following reactions as a...Ch. 3 - Classify each of the following reactions as a...Ch. 3 - Balance each of the following equations, and...Ch. 3 - Complete and balance the equations below, and...Ch. 3 - The products formed in several reactions are given...Ch. 3 - The products formed in several reactions are given...Ch. 3 - Balance the following equations: (a) for the...Ch. 3 - Balance the following equations: (a) for the...Ch. 3 - Give a formula for each of the following...Ch. 3 - Give the formula for each of the following...Ch. 3 - Indicate which of the following copper(II) salts...Ch. 3 - Name two anions that combine with Al3+ ion to...Ch. 3 - Write the net ionic equation and identify the...Ch. 3 - Identify and name the water-insoluble product in...Ch. 3 - Bromine is obtained from sea water by the...Ch. 3 - Identify each of the blowing substances as a...Ch. 3 - The mineral dolomite contains magnesium...Ch. 3 - Aqueous solutions of ammonium sulfide, (NH4)2S,...Ch. 3 - Identify the primary species (atoms, molecules, or...Ch. 3 - (a) Name and give formulas for two water-soluble...Ch. 3 - Balance equations for these reactions that occur...Ch. 3 - For each reaction, write an overall, balanced...Ch. 3 - You are given mixtures containing the following...Ch. 3 - Identify, from each list below, the compound or...Ch. 3 - Identify, from each list below, the compound or...Ch. 3 - Write net ionic equations for the following...Ch. 3 - Gas evolution was observed when a solution of Na2S...Ch. 3 - The following reaction can be used to prepare...Ch. 3 - If you have silverware in your home, you know it...Ch. 3 - Suppose you wish to prepare a sample of magnesium...Ch. 3 - A Suggest a laboratory method for preparing barium...Ch. 3 - The Toliens test for the presence of reducing...Ch. 3 - There are many ionic compounds that dissolve in...Ch. 3 - Most naturally occurring acids are weak acids....Ch. 3 - You want to prepare barium chloride, BaC12, using...Ch. 3 - Describe how to prepare BaSO4, barium sulfate, by...Ch. 3 - A Describe how to prepare zinc chloride by (a) an...Ch. 3 - A common method for analyzing for the nickel...Ch. 3 - The presence of arsenic in a sample that may also...

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