Introductory Chemistry: A Foundation
Introductory Chemistry: A Foundation
9th Edition
ISBN: 9781337399425
Author: Steven S. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Chapter 6, Problem 40QAP

Balance each of the following chemical equations.

msp;  Na 2 SO 4 ( a q ) + CaCl 2 ( a q ) CaSO 4 ( s ) + NaCl ( a q )

msp;  Fe ( s ) + H 2 O ( g ) Fe 3 O 4 ( s ) + H 2 ( g )

msp;  Ca ( OH ) 2 ( a q ) + HCl ( a q ) CaCl 2 ( a q ) + H 2 O ( l )

msp;  Br 2 ( g ) + H 2 O ( l ) + SO 2 ( g ) HBr ( a q ) + H 2 SO 4 ( a q )

msp;  NaOH ( s ) + H 3 PO 4 ( a q ) Na 3 PO 4 ( a q ) + H 2 O ( l )

msp;  Na 2 O 2 ( s ) + H 2 O ( l ) NaOH ( a q ) + O 2 ( g )

msp;  Si ( s ) + S 8 ( s ) Si 2 S 4 ( s )

Expert Solution
Check Mark
Interpretation Introduction

(a)

Interpretation:

The given chemical equation is to be balanced.

Concept Introduction:

In a balanced chemical reaction, the number of similar type of elements on both sides of the reaction is equal. To balance an unbalanced equation, the coefficients that are present before the compounds are changed but the subscripts in the formulas are not changed.

Answer to Problem 40QAP

Na2SO4(aq)+CaCl2(aq)CaSO4(s)+2NaCl(aq).

Explanation of Solution

The provided reaction is:

Na2SO4(aq)+CaCl2(aq)CaSO4(s)+NaCl(aq)

The most complicated molecule is not clear, so we start arbitrarily. If we place a coefficient of 2NaCl, we get a balanced equation.

Na2SO4(aq)+CaCl2(aq)CaSO4(s)+2NaCl(aq).

Expert Solution
Check Mark
Interpretation Introduction

(b)

Interpretation:

The given chemical equation is to be balanced.

Concept Introduction:

In a balanced chemical reaction, the number of similar type of elements on both sides of the reaction is equal. To balance an unbalanced equation, the coefficients that are present before the compounds are changed but the subscripts in the formulas are not changed.

Answer to Problem 40QAP

3Fe(s)+4H2O(g)Fe3O4(s)+4H2(g).

Explanation of Solution

The given unbalanced equation is:

Fe(s)+H2O(g)Fe3O4(s)+H2(g)

We start with placing 3 before Fe and 4 before H2 O and H2 We get the balanced chemical reaction as follows:

3Fe(s)+4H2O(g)Fe3O4(s)+4H2(g).

Expert Solution
Check Mark
Interpretation Introduction

(c)

Interpretation:

The given chemical equation is to be balanced.

Concept Introduction:

In a balanced chemical reaction, the number of similar type of elements on both sides of the reaction is equal. To balance an unbalanced equation, the coefficients that are present before the compounds are changed but the subscripts in the formulas are not changed.

Answer to Problem 40QAP

Ca(OH)2(aq)+2HCl(aq)CaCl2(aq)+2H2O(l).

Explanation of Solution

The given unbalanced equation is:

Ca(OH)2(aq)+HCl(aq)CaCl2(aq)+H2O(l)

We start by balancing HCl. If we place a coefficient 2 before HCl

Ca(OH)2(aq)+2HCl(aq)CaCl2(aq)+H2O(l)

If we place 2 before H2 O, we get a balanced chemical reaction as follows:

Ca(OH)2(aq)+2HCl(aq)CaCl2(aq)+2H2O(l).

Expert Solution
Check Mark
Interpretation Introduction

(d)

Interpretation:

The given chemical equation is to be balanced.

Concept Introduction:

In a balanced chemical reaction, the number of similar type of elements on both sides of the reaction is equal. To balance an unbalanced equation, the coefficients that are present before the compounds are changed but the subscripts in the formulas are not changed.

Answer to Problem 40QAP

Br2(g)+2H2O(l)+SO2(g)2HBr(aq)+H2SO4(aq).

Explanation of Solution

The provided equation is:

Br2(g)+H2O(l)+SO2(g)HBr(aq)+H2SO4(aq)

If we place a coefficient of 2 H2 O and HBr, we get a balanced equation.

Br2(g)+2H2O(l)+SO2(g)2HBr(aq)+H2SO4(aq).

Expert Solution
Check Mark
Interpretation Introduction

(e)

Interpretation:

The given chemical equation is to be balanced.

Concept Introduction:

In a balanced chemical reaction, the number of similar type of elements on both sides of the reaction is equal. To balance an unbalanced equation, the coefficients that are present before the compounds are changed but the subscripts in the formulas are not changed.

Answer to Problem 40QAP

3NaOH(s)+H3PO4(aq)Na3PO4(aq)+3H2O(l).

Explanation of Solution

The provided equation is:

NaOH(s)+H3PO4(aq)Na3PO4(aq)+H2O(l)

We start with NaOH. To balance Na. If we place a coefficient of 3 before NaOH

3NaOH(s)+H3PO4(aq)Na3PO4(aq)+H2O(l)

To balance oxygen, we place 3 before H2 O. We get the balanced chemical reaction as follows:

3NaOH(s)+H3PO4(aq)Na3PO4(aq)+3H2O(l).

Expert Solution
Check Mark
Interpretation Introduction

(f)

Interpretation:

The given chemical equation is to be balanced.

Concept Introduction:

In a balanced chemical reaction, the number of similar type of elements on both sides of the reaction is equal. To balance an unbalanced equation, the coefficients that are present before the compounds are changed but the subscripts in the formulas are not changed.

Answer to Problem 40QAP

2NaNO3(s)2NaNO2(s)+O2(g).

Explanation of Solution

The provided reaction is:

NaNO3(s)NaNO2(s)+O2(g)

To balance oxygen, we can start by placing 2 before NaNO2 and NaNO3. Now, we already have a balanced equation.

2NaNO3(s)2NaNO2(s)+O2(g).

Expert Solution
Check Mark
Interpretation Introduction

(g)

Interpretation:

The given chemical equation is to be balanced.

Concept Introduction:

In a balanced chemical reaction, the number of similar type of elements on both sides of the reaction is equal. To balance an unbalanced equation, the coefficients that are present before the compounds are changed but the subscripts in the formulas are not changed.

Answer to Problem 40QAP

2Na2O2(s)+2H2O(l)4NaOH(aq)+O2(g).

Explanation of Solution

The provided reaction is:

Na2O2(s)+H2O(l)NaOH(aq)+O2(g)

We start with balancing Na2O2. We place a coefficient 2 before Na2O2

2Na2O2(s)+H2O(l)NaOH(aq)+O2(g)

Now we can place 4 before NaOH and 2 before H2 O. We have a balanced equation

2Na2O2(s)+2H2O(l)4NaOH(aq)+O2(g).

Expert Solution
Check Mark
Interpretation Introduction

(h)

Interpretation:

The given chemical equation is to be balanced.

Concept Introduction:

In a balanced chemical reaction, the number of similar type of elements on both sides of the reaction is equal. To balance an unbalanced equation, the coefficients that are present before the compounds are changed but the subscripts in the formulas are not changed.

Answer to Problem 40QAP

4Si(s)+S8(s)2Si2S4(s).

Explanation of Solution

The provided reaction is:

Si(s)+S8(s)Si2S4(s)

Si2S4 is the most complicated element. It contains the most number of elements and we will start with the elements of Si2S4. If we place a coefficient of 2 before Si2S4

Si(s)+S8(s)2Si2S4(s)

Now we place 4 before Si and we have a balanced equation.

4Si(s)+S8(s)2Si2S4(s).

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Chapter 6 Solutions

Introductory Chemistry: A Foundation

Ch. 6 - Prob. 6ALQCh. 6 - Changing the subscripts of chemicals can...Ch. 6 - Table 6.1 lists some clues that a chemical...Ch. 6 - Use molecular-level drawings to show the...Ch. 6 - It is stated in Section 6.3 of the text that to...Ch. 6 - Prob. 11ALQCh. 6 - Consider the generic chemical equationaA+bBcC+dD...Ch. 6 - Prob. 13ALQCh. 6 - Which of the following correctly describes the...Ch. 6 - Which of the following correctly balances the...Ch. 6 - The reaction of an element X() with element Y() is...Ch. 6 - Prob. 1QAPCh. 6 - Prob. 2QAPCh. 6 - Although these days many people have...Ch. 6 - Prob. 4QAPCh. 6 - You have probably had the unpleasant experience of...Ch. 6 - If you’ve ever left bread in a toaster too long,...Ch. 6 - What are the substances to theleftof the arrow in...Ch. 6 - Prob. 8QAPCh. 6 - In a chemical reaction, the total number of atoms...Ch. 6 - Prob. 10QAPCh. 6 - Prob. 11QAPCh. 6 - The notation “(l)” after a substance’s formula...Ch. 6 - A common experiment to determine the relative...Ch. 6 - A common lecture demonstration called “elephant’s...Ch. 6 - If a sample of pure hydrogen gas is ignited very...Ch. 6 - Liquid hydrazine, has been used as a fuel for...Ch. 6 - If electricity of sufficient voltage is passed...Ch. 6 - Silver oxide may be decomposed by strong heating...Ch. 6 - Elemental boron is produced in one industrial...Ch. 6 - Many over-the-counter antacid tablets are now...Ch. 6 - Phosphorus trichloride is used in the manufacture...Ch. 6 - Pure silicon, which is needed in the manufacturing...Ch. 6 - Nitrous oxide gas (systematic name: dinitrogen...Ch. 6 - Solid zinc is added to an aqueous solution...Ch. 6 - Acetylene gas (C2H2) is often used by plumbers,...Ch. 6 - The burning of high-sulfur fuels has been shown to...Ch. 6 - The Group 2 metals (Ba, Ca, Sr) can be produced in...Ch. 6 - There are fears that the protective ozone layer...Ch. 6 - Carbon tetrachloride was widely used for many...Ch. 6 - When elemental phosphorus, P4, burns in oxygen...Ch. 6 - Calcium oxide is sometimes very challenging to...Ch. 6 - Prob. 32QAPCh. 6 - The element tin often occurs in nature as the...Ch. 6 - Nitric acid, HNO3 , can be produced by reacting...Ch. 6 - When balancing chemical equations, beginning...Ch. 6 - The “Chemistry in Focus” segment The Beetle That...Ch. 6 - Balance each of the following chemical equations....Ch. 6 - Balance the equations for the reaction of...Ch. 6 - Balance each of the following chemical equations....Ch. 6 - Balance each of the following chemical equations....Ch. 6 - Balance each of the following chemical equations....Ch. 6 - Prob. 42QAPCh. 6 - Prob. 43QAPCh. 6 - Prob. 44QAPCh. 6 - Acetylene gas, C2H2 , is used in welding because...Ch. 6 - When balancing a chemical equation, which of the...Ch. 6 - Crude gunpowders often contain a mixture of...Ch. 6 - The following demonstration takes place in a...Ch. 6 - Methanol (methyl alcohol), CH3OH , is a very...Ch. 6 - The Hall process is an important method by which...Ch. 6 - Iron oxide ores, commonly a mixture of FeO and...Ch. 6 - True or false? Coefficients can be fractions when...Ch. 6 - When steel wool (iron) is heated in pure oxygen...Ch. 6 - One method of producing hydrogen peroxide is to...Ch. 6 - When elemental boron, B, is burned in oxygen gas,...Ch. 6 - A common experiment in introductory chemistry...Ch. 6 - A common demonstration in chemistry courses...Ch. 6 - Write a balanced chemical equation for the...Ch. 6 - Prob. 59APCh. 6 - Prob. 60APCh. 6 - If you had a “sour stomach,” you might try an...Ch. 6 - When iron wire is heated in the presence of...Ch. 6 - When finely divided solid sodium is dropped into a...Ch. 6 - If aqueous solutions of potassium chromate and...Ch. 6 - When hydrogen sulfide, H2S , gas is bubbled...Ch. 6 - If an electric current is passed through aqueous...Ch. 6 - When a strip of magnesium metal is heated in...Ch. 6 - Prob. 68APCh. 6 - When solid red phosphorus, is burned in air, the...Ch. 6 - When copper (II) oxide is boiled in an aqueous...Ch. 6 - When lead(II) sulfide is heated lo high...Ch. 6 - Which of the following statements about chemical...Ch. 6 - Prob. 73APCh. 6 - Prob. 74APCh. 6 - Prob. 75APCh. 6 - Using different shapes to distinguish between...Ch. 6 - Which of the following statements about chemical...Ch. 6 - Prob. 78CPCh. 6 - Balance the following chemical equations....
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