MCGRAW: CHEMISTRY THE MOLECULAR NATURE
MCGRAW: CHEMISTRY THE MOLECULAR NATURE
8th Edition
ISBN: 9781264330430
Author: VALUE EDITION
Publisher: MCG
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Chapter 2.8, Problem 2.9BFP

(a)

Interpretation Introduction

Interpretation:

The correct formula for potassium sulfide is to be determined.

Concept introduction:

The formula of an ionic compound represents the total number of ions of each element present in it.

The general rules for writing the systematic names of ionic compounds are as follows:

1) In binary ionic compounds, the name of the metal is written as the original name whereas the name of the non-metal has the root word with the suffix -ide.

2) In metals that form more than one ion, the Latin root of the metal is followed by a suffix -ous for the ion with lower charge and suffix -ic for the ion with a higher charge. In the systematic name, the name of the metal is followed by the charge on the metal within the parentheses in roman numerals.

3) In the family of two oxoanions, the ion with more oxygen atoms has the non-metal root and a suffix -ate added to it. The ion with fewer oxygen atoms has the non-metal root and the suffix -ite added to it.

4) For hydrated ionic compounds, the total number of water molecules are represented by the Greek numerical prefixes followed by the word hydrate.

(a)

Expert Solution
Check Mark

Answer to Problem 2.9BFP

The correct formula for potassium sulfide is K2S.

Explanation of Solution

The element potassium belongs to the 1A(1) group in the periodic table and therefore loses an electron to form potassium ion as follows:

KK++e

Sulfur is a non-metal from the 6A(16) group in the periodic table. The formation of sulfide ion occurs by the gain of two electrons by an atom of sulfur as follows:

S+2eS2

An ionic compound is neutral as a whole since the total charge on the positive ions is balanced by the total charge on the negative ions. In order to balance the total charge of +2 on the sulfide ion, two potassium ions must combine with it in a 2:1 ratio as follows:

2K++S2K2S

Therefore the correct formula for potassium sulfide is K2S.

Conclusion

The correct formula for potassium sulfide is K2S.

(b)

Interpretation Introduction

Interpretation:

The correct formula for barium iodide is to be determined.

Concept introduction:

The formula of an ionic compound represents the total number of ions of each element present in it.

The general rules for writing the systematic names of ionic compounds are as follows:

1) In binary ionic compounds, the name of the metal is written as the original name whereas the name of the non-metal has the root word with the suffix -ide.

2) In metals that form more than one ion, the Latin root of the metal is followed by a suffix -ous for the ion with lower charge and suffix -ic for the ion with a higher charge. In the systematic name, the name of the metal is followed by the charge on the metal within the parentheses in roman numerals.

3) In the family of two oxoanions, the ion with more oxygen atoms has the non-metal root and a suffix -ate added to it. The ion with fewer oxygen atoms has the non-metal root and the suffix -ite added to it.

4) For hydrated ionic compounds, the total number of water molecules are represented by the Greek numerical prefixes followed by the word hydrate.

(b)

Expert Solution
Check Mark

Answer to Problem 2.9BFP

The correct formula for barium iodide is BaI2.

Explanation of Solution

The element barium is metal from the 2A(2) group in the periodic table and hence loses two electrons to form an ion as follows:

BaBa2++2e

Iodine is a non-metal from the 7A(17) group. Elements in this group gain an electron to form anions with 1 charge on them as follows;

I+eI

The charges on the barium and the iodide ions are +2 equal and 1 respectively. Therefore, barium and iodide ions combine in a 2:1 ratio to form a molecule of barium iodide as follows:

Ba2++2IBaI2

Conclusion

The correct formula for barium iodide is BaI2.

(c)

Interpretation Introduction

Interpretation:

The correct formula for cesium nitride is to be determined.

Concept introduction:

The formula of an ionic compound represents the total number of ions of each element present in it.

The general rules for writing the systematic names of ionic compounds are as follows:

1) In binary ionic compounds, the name of the metal is written as the original name whereas the name of the non-metal has the root word with the suffix -ide.

2) In metals that form more than one ion, the Latin root of the metal is followed by a suffix -ous for the ion with lower charge and suffix -ic for the ion with a higher charge. In the systematic name, the name of the metal is followed by the charge on the metal within the parentheses in roman numerals.

3) In the family of two oxoanions, the ion with more oxygen atoms has the non-metal root and a suffix -ate added to it. The ion with fewer oxygen atoms has the non-metal root and the suffix -ite added to it.

4) For hydrated ionic compounds, the total number of water molecules are represented by the Greek numerical prefixes followed by the word hydrate.

(c)

Expert Solution
Check Mark

Answer to Problem 2.9BFP

The correct formula for cesium nitride is Cs3N.

Explanation of Solution

Cesium is a metal from the 1A(1) group in the periodic table. Therefore an atom of cesium loses an electron to form the cesium ion as follows:

CsCs++e

The element nitrogen is a non-metal from the 5A(15) group in the periodic table. Therefore an atom of nitrogen gains three electrons to form the nitride ion as follows:

N+3eN3

The charges on the cesium and nitride ions are +1 and 3 respectively. Therefore to balance each other, the cesium and nitride ions combine in a 3:1 ratio to form a molecule of cesium nitride as follows:

3Cs++N3Cs3N

Conclusion

The correct formula for cesium nitride is Cs3N.

(d)

Interpretation Introduction

Interpretation:

The correct formula for sodium hydride is to be determined.

Concept introduction:

The formula of an ionic compound represents the total number of ions of each element present in it.

The general rules for writing the systematic names of ionic compounds are as follows:

1) In binary ionic compounds, the name of the metal is written as the original name whereas the name of the non-metal has the root word with the suffix -ide.

2) In metals that form more than one ion, the Latin root of the metal is followed by a suffix -ous for the ion with lower charge and suffix -ic for the ion with a higher charge. In the systematic name, the name of the metal is followed by the charge on the metal within the parentheses in roman numerals.

3) In the family of two oxoanions, the ion with more oxygen atoms has the non-metal root and a suffix -ate added to it. The ion with fewer oxygen atoms has the non-metal root and the suffix -ite added to it.

4) For hydrated ionic compounds, the total number of water molecules are represented by the Greek numerical prefixes followed by the word hydrate.

(d)

Expert Solution
Check Mark

Answer to Problem 2.9BFP

The correct formula for sodium hydride is NaH.

Explanation of Solution

The element sodium is a metal from the 1A(1) group in the periodic table. Therefore an atom of sodium loses an electron to form the sodium ion as follows:

NaNa++e

The element hydrogen is a non-metal from the 1A(1) group in the periodic table. Therefore, an atom of hydrogen gains an electron to form the hydride ion as follows:

H+eH

In order to balance the charges on each other, aluminium and hydride ions combine in a 1:1 ratio as follows:

Na++HNaH

Conclusion

The correct formula for sodium hydride is NaH.

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Chapter 2 Solutions

MCGRAW: CHEMISTRY THE MOLECULAR NATURE

Ch. 2.5 - Prob. B2.1PCh. 2.5 - Prob. B2.2PCh. 2.6 - Prob. 2.6AFPCh. 2.6 - Prob. 2.6BFPCh. 2.7 - Prob. 2.7AFPCh. 2.7 - Prob. 2.7BFPCh. 2.8 - Prob. 2.8AFPCh. 2.8 - Prob. 2.8BFPCh. 2.8 - Prob. 2.9AFPCh. 2.8 - Prob. 2.9BFPCh. 2.8 - Prob. 2.10AFPCh. 2.8 - Prob. 2.10BFPCh. 2.8 - Prob. 2.11AFPCh. 2.8 - Prob. 2.11BFPCh. 2.8 - Prob. 2.12AFPCh. 2.8 - Prob. 2.12BFPCh. 2.8 - Prob. 2.13AFPCh. 2.8 - Prob. 2.13BFPCh. 2.8 - Prob. 2.14AFPCh. 2.8 - Prob. 2.14BFPCh. 2.8 - Prob. 2.15AFPCh. 2.8 - Prob. 2.15BFPCh. 2.8 - Prob. 2.16AFPCh. 2.8 - Prob. 2.16BFPCh. 2.8 - Determine the name, formula, and molecular (or...Ch. 2.8 - Prob. 2.17BFPCh. 2.9 - Prob. B2.3PCh. 2 - Prob. 2.1PCh. 2 - List two differences between a compound and a...Ch. 2 - Which of the following are pure substances?...Ch. 2 - Classify each substance in Problem 2.3 as an...Ch. 2 - Explain the following statement: The smallest...Ch. 2 - Prob. 2.6PCh. 2 - Can the relative amounts of the components of a...Ch. 2 - Prob. 2.8PCh. 2 - Prob. 2.9PCh. 2 - Prob. 2.10PCh. 2 - Prob. 2.11PCh. 2 - Prob. 2.12PCh. 2 - In our modern view of matter and energy, is the...Ch. 2 - Prob. 2.14PCh. 2 - Which of the following scenes illustrate(s) the...Ch. 2 - Prob. 2.16PCh. 2 - Prob. 2.17PCh. 2 - Prob. 2.18PCh. 2 - Prob. 2.19PCh. 2 - Fluorite, a mineral of calcium, is a compound of...Ch. 2 - Prob. 2.21PCh. 2 - Prob. 2.22PCh. 2 - Prob. 2.23PCh. 2 - Prob. 2.24PCh. 2 - Prob. 2.25PCh. 2 - Prob. 2.26PCh. 2 - Prob. 2.27PCh. 2 - Dolomite is a carbonate of magnesium and calcium....Ch. 2 - Prob. 2.29PCh. 2 - Which of Dalton’s postulates about atoms are...Ch. 2 - Use Dalton’s theory to explain why potassium...Ch. 2 - Prob. 2.32PCh. 2 - The following charges on individual oil droplets...Ch. 2 - Prob. 2.34PCh. 2 - When Rutherford’s coworkers bombarded gold foil...Ch. 2 - Prob. 2.36PCh. 2 - Prob. 2.37PCh. 2 - Prob. 2.38PCh. 2 - Prob. 2.39PCh. 2 - Prob. 2.40PCh. 2 - Prob. 2.41PCh. 2 - Prob. 2.42PCh. 2 - Write the notation for each atomic depiction: Ch. 2 - Write the notation for each atomic depiction: Ch. 2 - Draw atomic depictions similar to those in Problem...Ch. 2 - Prob. 2.46PCh. 2 - Prob. 2.47PCh. 2 - Prob. 2.48PCh. 2 - Chlorine has two naturally occurring isotopes,...Ch. 2 - Prob. 2.50PCh. 2 - Prob. 2.51PCh. 2 - Prob. 2.52PCh. 2 - Prob. 2.53PCh. 2 - Prob. 2.54PCh. 2 - Prob. 2.55PCh. 2 - Prob. 2.56PCh. 2 - Prob. 2.57PCh. 2 - Prob. 2.58PCh. 2 - Prob. 2.59PCh. 2 - Prob. 2.60PCh. 2 - Prob. 2.61PCh. 2 - Prob. 2.62PCh. 2 - Prob. 2.63PCh. 2 - Prob. 2.64PCh. 2 - Prob. 2.65PCh. 2 - Prob. 2.66PCh. 2 - Prob. 2.67PCh. 2 - Prob. 2.68PCh. 2 - Prob. 2.69PCh. 2 - Prob. 2.70PCh. 2 - What monatomic ions would you expect radium (Z =...Ch. 2 - Prob. 2.72PCh. 2 - Prob. 2.73PCh. 2 - Prob. 2.74PCh. 2 - Prob. 2.75PCh. 2 - The radii of the sodium and potassium ions are 102...Ch. 2 - Prob. 2.77PCh. 2 - What information about the relative numbers of...Ch. 2 - Prob. 2.79PCh. 2 - Prob. 2.80PCh. 2 - Prob. 2.81PCh. 2 - Prob. 2.82PCh. 2 - Prob. 2.83PCh. 2 - Prob. 2.84PCh. 2 - Prob. 2.85PCh. 2 - Prob. 2.86PCh. 2 - Prob. 2.87PCh. 2 - Prob. 2.88PCh. 2 - Give the systematic names for the formulas or the...Ch. 2 - Prob. 2.90PCh. 2 - Prob. 2.91PCh. 2 - Prob. 2.92PCh. 2 - Prob. 2.93PCh. 2 - Prob. 2.94PCh. 2 - Prob. 2.95PCh. 2 - Prob. 2.96PCh. 2 - Prob. 2.97PCh. 2 - Prob. 2.98PCh. 2 - Prob. 2.99PCh. 2 - Prob. 2.100PCh. 2 - Prob. 2.101PCh. 2 - Prob. 2.102PCh. 2 - Prob. 2.103PCh. 2 - Prob. 2.104PCh. 2 - Prob. 2.105PCh. 2 - Prob. 2.106PCh. 2 - Prob. 2.107PCh. 2 - Prob. 2.108PCh. 2 - Prob. 2.109PCh. 2 - Prob. 2.110PCh. 2 - Prob. 2.111PCh. 2 - Prob. 2.112PCh. 2 - What is the difference between a homogeneous and a...Ch. 2 - Prob. 2.114PCh. 2 - Prob. 2.115PCh. 2 - Prob. 2.116PCh. 2 - Which separation method is operating in each of...Ch. 2 - Prob. 2.118PCh. 2 - Prob. 2.119PCh. 2 - Prob. 2.120PCh. 2 - Prob. 2.121PCh. 2 - Prob. 2.122PCh. 2 - Ammonium dihydrogen phosphate, formed from the...Ch. 2 - Prob. 2.124PCh. 2 - Prob. 2.125PCh. 2 - Prob. 2.126PCh. 2 - Prob. 2.127PCh. 2 - Prob. 2.128PCh. 2 - The following scenes represent a mixture of two...Ch. 2 - Prob. 2.130PCh. 2 - Prob. 2.131PCh. 2 - Prob. 2.132PCh. 2 - Prob. 2.133PCh. 2 - Prob. 2.134PCh. 2 - Prob. 2.135PCh. 2 - Prob. 2.136PCh. 2 - Prob. 2.137PCh. 2 - Prob. 2.138PCh. 2 - Prob. 2.139PCh. 2 - Prob. 2.140PCh. 2 - Prob. 2.141PCh. 2 - Prob. 2.142PCh. 2 - Prob. 2.143PCh. 2 - Prob. 2.144P
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