10/3/2016
Homework 2 ­ Ch2
Homework 2 ­ Ch2
Due: 8:00am on Wednesday, October 12, 2016
You will receive no credit for items you complete after the assignment is due. Grading Policy
Sample Exercise 2.10 Practice Exercise 1 with feedback
Part A ­ Using Ionic Charge to Write Empirical Formulas for Ionic Compounds
For the following ionic compounds formed with S
2−
, what is the empirical formula for the positive ion involved?
(a) MnS, (b) Fe2 S3 , (c) MoS2 , (d) K2 S, (e) Ag2 S
Express your answers as positive ions separated by a comma.
ANSWER:
Problem 2.33
Part A
What isotope is used as the standard in establishing the atomic mass scale?
ANSWER:
Part B
The atomic weight of boron is reported as 10.81, yet no atom of boron has the mass of 10.81 amu. Explain.
ANSWER:
Essay answers are limited to about 500 words (3800 characters maximum, including spaces).
3785 Character(s) remaining
(none provided)
Problem 2.105
Fill in the blanks in the following table: Cation Anion Formula
Name
Lithium oxide
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Homework 2 ­ Ch2
Fe
2+
3−
PO
4
Al2 (SO4 )
3
Copper(II) nitrate
3+
Cr
I
−
Mn(ClO2 )
2
Ammonium carbonate
Zinc perchlorate
Part A
Complete the first column of the table.
Enter your answers as ions. Enter your answers in order given in the table from top to bottom separated by
commas. Miss cells that are already filled.
ANSWER:
Part B
Complete the second column of the table.
Enter your answers as ions. Enter your answers in order given in the table from top to bottom separated by
commas. Miss cells that are already filled.
ANSWER:
Part C
Complete the third column of the table.
Enter your answers as chemical formulas. Enter your answers in order given in the table from top to bottom
separated by commas. Miss cells that are already filled.
ANSWER:
Part D
Complete the fourth column of the table.
Enter your answers as full name of the compounds. Enter your answers in order given in the table from top to
bottom separated by commas. If a metal can form cations with different charges, indicate the positive charge by a
Roman numeral in parentheses following the name of the metal. Miss cells that are already filled.
ANSWER:
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Homework 2 ­ Ch2
Problem 2.104
Name each of the following oxides.
Part A
NiO
ANSWER:
Part B
MnO2
ANSWER:
Part C
Cr2 O3
ANSWER:
Part D
MoO3
ANSWER:
Part E
Assuming that the compounds are ionic, what charge is associated with the metallic element in each case?
Express your answers as ions separated by commas.
ANSWER:
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Homework 2 ­ Ch2
Problem 2.63
Complete the table by filling in the formula for the ionic compound formed by each pair of cations and anions, as shown for the
first pair. Ion
Cl
+
K
−
OH
+
NH
4
2+
Mg
3+
Fe
KCl
−
2−
CO
3
PO
3−
4
Part A
Complete the first row of the table.
Express your answers as chemical formulas separated by a commas.
ANSWER:
Part B
Complete the second row of the table.
Express your answers as chemical formulas separated by a commas.
ANSWER:
Part C
Complete the third row of the table.
Express your answers as chemical formulas separated by a commas.
ANSWER:
Part D
Complete the fourth row of the table.
Express your answers as chemical formulas separated by a commas.
ANSWER:
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Homework 2 ­ Ch2
Problem 2.65
Part A
Predict whether each of the following compounds is molecular or ionic.
Drag the items into the appropriate bins.
ANSWER:
Problem 2.66
Part A
Which of the following are ionic, and which are molecular?
Drag the compounds into the appropriate bins.
ANSWER:
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Homework 2 ­ Ch2
Go Figure 2.22
Procedure for naming anions. The first part of the element's name, such as "chlor" for chlorine or "sulf" for sulfur, goes in the
blank.
Part A
Name the anion obtained by removing one oxygen atom from the perbromate ion, BrO4 ­ ANSWER:
Problem 2.8
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Homework 2 ­ Ch2
The following diagramrepresents an ionic compound in which the red spheres represent cations and blue spheres represent
anions.
Part A
Which of the following formulas is consistent with the drawing: KBr, K2 SO4 , Ca (NO3 ) 2 , Fe2 (SO4 ) 3 ?
ANSWER:
KBr
K2 SO4
Ca (NO3 ) 2
Fe2 (SO4 ) 3
Part B
Name the compound from the above consistent with the drawing.
ANSWER:
Problem 2.53
Write the molecular and structural formulas for the compounds represented by the molecular models in the figure .
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Homework 2 ­ Ch2
Part A
Write the molecular formula for the compound (a).
Express your answer as a chemical formula.
ANSWER:
Part B
Write the structural formula for the compound (a).
Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all hydrogen atoms.
ANSWER:
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Homework 2 ­ Ch2
Part C
Write the molecular formula for the compound (b).
Express your answer as a chemical formula.
ANSWER:
Part D
Write the structural formula for the compound (b).
Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all hydrogen atoms.
ANSWER:
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Homework 2 ­ Ch2
Part E
Write the molecular formula for the compound (c).
Express your answer as a chemical formula.
ANSWER:
Part F
Write the structural formula for the compound (c).
Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all hydrogen atoms.
ANSWER:
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Homework 2 ­ Ch2
Part G
Write the molecular formula for the compound (d).
Express your answer as a chemical formula.
ANSWER:
Part H
Write the structural formula for the compound (d).
Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all hydrogen atoms.
ANSWER:
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Homework 2 ­ Ch2
Problem 2.61
Part A
2+
Predict the chemical formula for the ionic compound formed by Ca
−
and Br .
Express your answer as a chemical formula.
ANSWER:
Part B
+
2−
Predict the chemical formula for the ionic compound formed by K and CO3 .
Express your answer as a chemical formula.
ANSWER:
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Homework 2 ­ Ch2
Part C
Predict the chemical formula for the ionic compound formed by Al3+ and CH3 COO − .
Express your answer as a chemical formula.
ANSWER:
Part D
Predict the chemical formula for the ionic compound formed by NH+
and SO2−
.
4
4
Express your answer as a chemical formula.
ANSWER:
Part E
Predict the chemical formula for the ionic compound formed by Mg2+ and PO3−
.
4
Express your answer as a chemical formula.
ANSWER:
Sample Exercise 2.11 Practice Exercise 1 with feedback
Part A ­ Determining the Formula of an Oxyanion from Its Name
Which of the following oxyanions is incorrectly named?
ANSWER:
NO− , hyponitrite
ClO2 − , chlorate
SeO4 2− , selenate
IO4 − , periodate
SO3 2− , sulfite
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