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Chang - Chemistry 8/e (Homework)

James Finch

Chemistry - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 3 / 14

Due : Wednesday, September 4, 2019 08:00 EDT

Last Saved : n/a Saving...  ()

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Question
Points
1 2 3 4
–/5 –/2 –/1 –/6
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3/14 (21.4%)

  • Instructions

    Chemistry 8/e by Raymond Chang published by McGraw-Hill Higher Education now has animations with conceptual questions and tutorial problems offering feedback and hints to guide student content mastery, as well as over 1150 end-of-chapter questions. You can check out a sampling of this exciting development below.

    Designed by teachers for teachers, WebAssign is easy to use and reliable -- a trusted companion to your teaching. Sign up for a Free Trial today!

    Click here for a list of all of the questions coded in WebAssign.

    Question 1 is an animation with an assignable quiz attached.

    Question 2 is a follow-up Practice Exercise which checks student understanding of the related Example in the textbook. Practice Exercise 3.1, for example, is directly related to Exercise 3.1.

    Question 3 and 4 are algorithmic end-of-chapter problems with conditional feedback added to the numerical answers.

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. –/5 points Chang8 3.Animation.01. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5
–/1 –/1 –/1 –/1 –/1
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Limiting Reactant Use the animation to answer the following questions.
(a) In the animation reaction, if 4 NO and 4 O2 are mixed, how many molecules of the product form?
(No Response) molecules

(b) When 6 NO and 3 O2 are used in the reaction in the animation, the limiting reactant is:
    


(c) The opening of the valve between the two bulbs determines:
    

This animation will begin with a narration when you click "Open in New Window" below. To restart the narration, click "Open in New Window" again.
(d) If there is excess oxygen present in the reaction, this can be seen in the animation by the presence of:
    


(e) Which of the following characterizes the reaction shown in the animation which utilizes the 6 NO to 2 O2 mole ratio?
    
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2. –/2 points Chang8 3.PracticeEx.13. My Notes
Question Part
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Practice Exercise 3.13 about this problem
The reaction between nitric oxide (NO) and oxygen to form nitrogen dioxide (NO2) is a key step in photochemical smog formation.

2 NO(g) + O2(g) 2 NO2(g)

(a) How many moles of NO2 are formed by the complete reaction of 0.404 mole of O2?
WebAssign will check your answer for the correct number of significant figures.(No Response) moles
(b) How many grams of NO2 are formed by the complete reaction of 3.34 g of NO?
WebAssign will check your answer for the correct number of significant figures.(No Response) grams
HINTS
I'm Stuck
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3. –/1 points Chang8 3.AlgoEOCP.073. My Notes
Question Part
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Submissions Used
1
–/1
0/50
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–/1
 
Each copper(II) sulfate unit is associated with five water molecules in crystalline copper(II) sulfate pentahydrate (CuSO4·5 H2O). When this compound is heated in air above 100°C, it loses the water molecules and also its blue color.

CuSO4·5 H2O CuSO4 + 5 H2O

If 8.50 g of CuSO4 are left after heating 13.29 g of the blue compound, calculate the number of moles of H2O originally present in the compound.
WebAssign will check your answer for the correct number of significant figures.(No Response) moles
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4. –/6 points Chang8 3.AlgoEOCP.115. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6
–/1 –/1 –/1 –/1 –/1 –/1
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–/6
 
Calculate the number of cations and anions in each of the following compounds.
(a) 8.91 g of KBr
WebAssign will check your answer for the correct number of significant figures.(No Response) cations
WebAssign will check your answer for the correct number of significant figures.(No Response) anions
(b) 5.40 g of Na2SO4
WebAssign will check your answer for the correct number of significant figures.(No Response) cations
WebAssign will check your answer for the correct number of significant figures.(No Response) anions
(c) 7.60 g of Ca3(PO4)2
WebAssign will check your answer for the correct number of significant figures.(No Response) cations
WebAssign will check your answer for the correct number of significant figures.(No Response) anions
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