WebAssign is not supported for this browser version. Some features or content might not work. System requirements

WebAssign

Welcome, demo@demo

(sign out)

Sunday, April 6, 2025 11:39 EDT

Home My Assignments Grades Communication Calendar My eBooks

Gilbert et al - Chemistry: Sci in Context 4/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 10 / 36

Due : Wednesday, September 11, 2019 07:00 EDT

Last Saved : n/a Saving...  ()

Print Assignment
Question
Points
1 2 3 4 5 6 7 8
–/3 –/4 –/10 –/8 –/4 –/3 –/1 –/3
Total
10/36 (27.8%)

  • Instructions

    Chemistry: The Science in Context fourth edition by Gilbert, Kirss, Foster, and Davies, published by W. W. Norton, supports all kind of learners, regardless of how they use the book, by helping them connect chemistry to their world, see that world from a molecular point of view, and become expert problem solvers. WebAssign provides immediate student feedback for end-of-chapter questions straight from the textbook.

    Question 1 shows how randomizations can make multiple-choice questions more challenging.

    Questions 2 and 3 show numeric grading, with or without significant figures grading.

    Questions 4 and 5 show structure drawing with MarvinSketch.

    Questions 6 and 7 show alternate ways of presenting multiple-choice options.

    Question 8 shows that randomizations are not limited to numbers and can include chemical formulas and reactions.

    View the complete list of WebAssign questions available for this textbook.

Assignment Submission

For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer.

Assignment Scoring

Your last submission is used for your score.

1. –/3 points GilChem4 3.P.022. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/100 0/100 0/100
Total
–/3
 
Which substance in each of the following pairs of quantities contains more moles of oxygen?
(a) 2 moles of N2O or 1 mole of N2O5
    
(b) 2 moles of NO or 1 mole of calcium nitrate
    
(c) 2 moles of NO2 or 1 mole of sodium nitrite
    
Your work in question(s) will also be submitted or saved.
Viewing Saved Work Revert to Last Response
2. –/4 points GilChem4 3.P.020. My Notes
Question Part
Points
Submissions Used
1 2 3 4
–/1 –/1 –/1 –/1
0/100 0/100 0/100 0/100
Total
–/4
 
How many atoms of iron are there in 3.0 moles of each of the following?
(a) hematite, Fe2O3
WebAssign will check your answer for the correct number of significant figures.(No Response) atoms

(b) magnetite, Fe3O4
WebAssign will check your answer for the correct number of significant figures.(No Response) atoms

(c) pyrite, FeS2
WebAssign will check your answer for the correct number of significant figures.(No Response) atoms

(d) wolframite, FeWO4
WebAssign will check your answer for the correct number of significant figures.(No Response) atoms
Your work in question(s) will also be submitted or saved.
Viewing Saved Work Revert to Last Response
3. –/10 points GilChem4 3.P.078. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6 7 8 9 10
–/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1
0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100
Total
–/10
 
Calculate the percent composition of the following.
(a) strontium nitrate
Sr
(No Response) %
O
(No Response) %
N
(No Response) % 		(b) H2SO3
H
(No Response) %
S
(No Response) %
O
(No Response) %
(c) aluminum sulfide
Al
(No Response) %
S
(No Response) % 		(d) Na2O
Na
(No Response) %
O
(No Response) %
Your work in question(s) will also be submitted or saved.
Viewing Saved Work Revert to Last Response
4. –/8 points GilChem4 8.P.032. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6 7 8
–/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1
0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100
Total
–/8
 
Draw the Lewis symbol for the following atoms or ions. How many valence electrons are in each atom or ion? (Assign atomic charges where appropriate.)
(a) Xe (No Response) number of valence electrons in Xe
(No Response)

(b) Cl − (No Response) number of valence electrons in Cl −
(No Response)

(c) I − (No Response) number of valence electrons in I −
(No Response)

(d) F (No Response) number of valence electrons in F
(No Response)
Your work in question(s) will also be submitted or saved.
Viewing Saved Work Revert to Last Response
5. –/4 points GilChem4 8.P.038. My Notes
Question Part
Points
Submissions Used
1 2 3 4
–/1 –/1 –/1 –/1
0/100 0/100 0/100 0/100
Total
–/4
 
Draw the Lewis structures for the following diatomic molecules or ions. (Assign atomic charges where appropriate.)
(a) NO+ (No Response)
(b) SO (No Response)
(c) HI (No Response)
(d) F2 (No Response)
Your work in question(s) will also be submitted or saved.
Viewing Saved Work Revert to Last Response
6. –/3 points GilChem3 8.P.014. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/100 0/100 0/100
Total
–/3
 
Which group among the main-group elements in the periodic table contains atoms that have the following?
(a) four valence electrons
(No Response)

(b) one valence electron
(No Response)

(c) six valence electrons
(No Response)
Your work in question(s) will also be submitted or saved.
Viewing Saved Work Revert to Last Response
7. –/1 points GilChem3 8.P.048. My Notes
Question Part
Points
Submissions Used
1
–/1
0/100
Total
–/1
 
How do the electronegativities of the elements change across a period and down a group? (Select all that apply.)

Viewing Saved Work Revert to Last Response
8. –/3 points GilChem3 8.P.126. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/100 0/100 0/100
Total
–/3
 
Use the average bond energies in the table to estimate the enthalpy changes of the following reactions. [Hint: The heat of sublimation of graphite, C(s), is 719 kJ/mol.]
(a) H2(g) + Cl2(g) → 2 HCl(g)
(No Response) kJ/mol

(b) N2(g) + O2(g) → 2 NO(g)
(No Response) kJ/mol

(c) N2(g) + 3 H2(g) → 2 NH3(g)
(No Response) kJ/mol
Your work in question(s) will also be submitted or saved.
Viewing Saved Work Revert to Last Response
Home My Assignments