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Gilbert et al - Chemistry: Sci in Context 5/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 3 / 36

Due : Wednesday, September 11, 2019 06:30 EDT

Last Saved : n/a Saving...  ()

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Question
Points
1 2 3 4 5 6 7 8
–/3 –/4 –/10 –/8 –/4 –/3 –/1 –/3
Total
3/36 (8.3%)

  • Instructions

    Chemistry: The Science in Context, fifth edition, by Gilbert, Kirss, Foster, Bretz, and Davies and published by W.W. Norton, supports all kinds 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 Marvin JS.

    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. This demo assignment allows many submissions and allows you to try another version of the same question for practice wherever the problem has randomized values.

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 GilChem5 3.P.037. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/100 0/100 0/100
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–/3
 
Suppose pairs of balloons are filled with 15.0 g of the following pairs of gases. Which balloon in each pair has the greater number of particles?
(a) HCN or Cl2
    

(b) F2 or CO
    

(c) NO2 or O2
    
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2. –/4 points GilChem5 3.P.022. My Notes
Question Part
Points
Submissions Used
1 2 3 4
–/1 –/1 –/1 –/1
0/100 0/100 0/100 0/100
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–/4
 
How many atoms of iron are there in 3.4 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) pyrite, FeS2
WebAssign will check your answer for the correct number of significant figures.(No Response) atoms

(c) wolframite, FeWO4
WebAssign will check your answer for the correct number of significant figures.(No Response) atoms

(d) magnetite, Fe3O4
WebAssign will check your answer for the correct number of significant figures.(No Response) atoms
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3. –/10 points GilChem5 3.P.080. 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) sodium carbonate
Na
(No Response) %
O
(No Response) %
C
(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) %
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4. –/8 points GilChem5 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
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–/8
 
Draw the Lewis symbol for the following atoms or ions. How many valence electrons are in each atom or ion? (Assign lone pairs, radical electrons, and atomic charges where appropriate.)
(a) I − (No Response) number of valence electrons in I −
(No Response)

(b) Sr2+ (No Response) number of valence electrons in Sr2+
(No Response)

(c) Cl (No Response) number of valence electrons in Cl
(No Response)

(d) Kr (No Response) number of valence electrons in Kr
(No Response)
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5. –/4 points GilChem5 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
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–/4
 
Draw the Lewis structures for the following diatomic molecules or ions. (Assign lone pairs, radical electrons, and atomic charges where appropriate.)
(a) SO (No Response)
(b) O2 (No Response)
(c) CO (No Response)
(d) Br2 (No Response)
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6. –/3 points GilChem5 8.P.039. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/100 0/100 0/100
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–/3
 
Which group among the main-group elements in the periodic table contains atoms that have the following?
(a) seven valence electrons
(No Response)

(b) one valence electron
(No Response)

(c) two valence electron
(No Response)
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7. –/1 points GilChem5 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.)

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8. –/3 points GilChem5 8.P.128. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/100 0/100 0/100
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–/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) + 3 H2(g) → 2 NH3(g)
(No Response) kJ/mol

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